mirror of
https://github.com/musix-org/musix-oss
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1683 lines
62 KiB
JavaScript
1683 lines
62 KiB
JavaScript
/**
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* @license Copyright 2017 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Firebase Database API.
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* @externs
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*/
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/**
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* Gets the {@link firebase.database.Database `Database`} service for the
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* default app or a given app.
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*
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* `firebase.database()` can be called with no arguments to access the default
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* app's {@link firebase.database.Database `Database`} service or as
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* `firebase.database(app)` to access the
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* {@link firebase.database.Database `Database`} service associated with a
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* specific app.
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*
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* `firebase.database` is also a namespace that can be used to access global
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* constants and methods associated with the `Database` service.
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*
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* @example
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* // Get the Database service for the default app
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* var defaultDatabase = firebase.database();
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*
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* @example
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* // Get the Database service for a specific app
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* var otherDatabase = firebase.database(app);
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*
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* @namespace
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* @param {!firebase.app.App=} app Optional app whose Database service to
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* return. If not provided, the default Database service will be returned.
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* @return {!firebase.database.Database} The default Database service if no app
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* is provided or the Database service associated with the provided app.
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*/
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firebase.database = function(app) {};
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/**
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* Gets the {@link firebase.database.Database `Database`} service for the
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* current app.
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*
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* @example
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* var database = app.database();
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* // The above is shorthand for:
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* // var database = firebase.database(app);
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*
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* @return {!firebase.database.Database}
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*/
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firebase.app.App.prototype.database = function() {};
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/**
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* The Firebase Database service interface.
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*
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* Do not call this constructor directly. Instead, use
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* {@link firebase.database `firebase.database()`}.
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*
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* See
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* {@link
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* https://firebase.google.com/docs/database/web/start/
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* Installation & Setup in JavaScript}
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* for a full guide on how to use the Firebase Database service.
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*
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* @interface
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*/
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firebase.database.Database = function() {};
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/**
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* Logs debugging information to the console.
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*
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* @example
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* // Enable logging
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* firebase.database.enableLogging(true);
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*
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* @example
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* // Disable logging
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* firebase.database.enableLogging(false);
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*
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* @example
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* // Enable logging across page refreshes
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* firebase.database.enableLogging(true, true);
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*
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* @example
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* // Provide custom logger which prefixes log statements with "[FIREBASE]"
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* firebase.database.enableLogging(function(message) {
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* console.log("[FIREBASE]", message);
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* });
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*
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* @param {(boolean|function(string))=} logger Enables logging if `true`;
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* disables logging if `false`. You can also provide a custom logger function
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* to control how things get logged.
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* @param {boolean=} persistent Remembers the logging state between page
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* refreshes if `true`.
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*/
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firebase.database.enableLogging = function(logger, persistent) {};
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/**
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* @namespace
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*/
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firebase.database.ServerValue = {};
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/**
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* A placeholder value for auto-populating the current timestamp (time
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* since the Unix epoch, in milliseconds) as determined by the Firebase
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* servers.
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*
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* @example
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* var sessionsRef = firebase.database().ref("sessions");
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* sessionsRef.push({
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* startedAt: firebase.database.ServerValue.TIMESTAMP
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* });
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*
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* @const {!Object}
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*/
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firebase.database.ServerValue.TIMESTAMP;
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/**
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* The {@link firebase.app.App app} associated with the `Database` service
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* instance.
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*
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* @example
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* var app = database.app;
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*
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* @type {!firebase.app.App}
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*/
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firebase.database.Database.prototype.app;
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/**
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* Returns a `Reference` representing the location in the Database
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* corresponding to the provided path. If no path is provided, the `Reference`
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* will point to the root of the Database.
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*
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* @example
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* // Get a reference to the root of the Database
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* var rootRef = firebase.database().ref();
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*
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* @example
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* // Get a reference to the /users/ada node
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* var adaRef = firebase.database().ref("users/ada");
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* // The above is shorthand for the following operations:
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* //var rootRef = firebase.database().ref();
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* //var adaRef = rootRef.child("users/ada");
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*
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* @param {string=} path Optional path representing the location the returned
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* `Reference` will point. If not provided, the returned `Reference` will
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* point to the root of the Database.
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* @return {!firebase.database.Reference} If a path is provided, a `Reference`
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* pointing to the provided path. Otherwise, a `Reference` pointing to the
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* root of the Database.
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*/
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firebase.database.Database.prototype.ref = function(path) {};
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/**
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* Returns a `Reference` representing the location in the Database
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* corresponding to the provided Firebase URL.
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*
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* An exception is thrown if the URL is not a valid Firebase Database URL or it
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* has a different domain than the current `Database` instance.
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*
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* Note that all query parameters (`orderBy`, `limitToLast`, etc.) are ignored
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* and are not applied to the returned `Reference`.
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*
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* @example
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* // Get a reference to the root of the Database
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* var rootRef = firebase.database().ref("https://<DATABASE_NAME>.firebaseio.com");
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*
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* @example
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* // Get a reference to the /users/ada node
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* var adaRef = firebase.database().ref("https://<DATABASE_NAME>.firebaseio.com/users/ada");
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*
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* @param {string} url The Firebase URL at which the returned `Reference` will
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* point.
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* @return {!firebase.database.Reference} A `Reference` pointing to the provided
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* Firebase URL.
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*/
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firebase.database.Database.prototype.refFromURL = function(url) {};
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/**
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* Disconnects from the server (all Database operations will be completed
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* offline).
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*
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* The client automatically maintains a persistent connection to the Database
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* server, which will remain active indefinitely and reconnect when
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* disconnected. However, the `goOffline()` and `goOnline()` methods may be used
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* to control the client connection in cases where a persistent connection is
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* undesirable.
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*
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* While offline, the client will no longer receive data updates from the
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* Database. However, all Database operations performed locally will continue to
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* immediately fire events, allowing your application to continue behaving
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* normally. Additionally, each operation performed locally will automatically
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* be queued and retried upon reconnection to the Database server.
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*
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* To reconnect to the Database and begin receiving remote events, see
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* `goOnline()`.
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*
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* @example
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* firebase.database().goOffline();
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*/
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firebase.database.Database.prototype.goOffline = function() {};
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/**
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* Reconnects to the server and synchronizes the offline Database state
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* with the server state.
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*
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* This method should be used after disabling the active connection with
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* `goOffline()`. Once reconnected, the client will transmit the proper data
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* and fire the appropriate events so that your client "catches up"
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* automatically.
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*
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* @example
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* firebase.database().goOnline();
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*/
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firebase.database.Database.prototype.goOnline = function() {};
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/**
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* A `Reference` represents a specific location in your Database and can be used
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* for reading or writing data to that Database location.
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*
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* You can reference the root or child location in your Database by calling
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* `firebase.database().ref()` or `firebase.database().ref("child/path")`.
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*
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* Writing is done with the `set()` method and reading can be done with the
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* `on()` method. See
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* {@link
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* https://firebase.google.com/docs/database/web/read-and-write
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* Read and Write Data on the Web}
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*
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* @interface
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* @extends {firebase.database.Query}
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*/
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firebase.database.Reference = function() {};
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/**
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* The last part of the `Reference`'s path.
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*
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* For example, `"ada"` is the key for
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* `https://<DATABASE_NAME>.firebaseio.com/users/ada`.
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*
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* The key of a root `Reference` is `null`.
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*
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* @example
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* // The key of a root reference is null
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* var rootRef = firebase.database().ref();
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* var key = rootRef.key; // key === null
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*
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* @example
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* // The key of any non-root reference is the last token in the path
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* var adaRef = firebase.database().ref("users/ada");
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* var key = adaRef.key; // key === "ada"
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* key = adaRef.child("name/last").key; // key === "last"
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*
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* @type {string|null}
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*/
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firebase.database.Reference.prototype.key;
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/**
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* Gets a `Reference` for the location at the specified relative path.
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*
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* The relative path can either be a simple child name (for example, "ada") or
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* a deeper slash-separated path (for example, "ada/name/first").
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*
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* @example
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* var usersRef = firebase.database().ref('users');
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* var adaRef = usersRef.child('ada');
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* var adaFirstNameRef = adaRef.child('name/first');
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* var path = adaFirstNameRef.toString();
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* // path is now 'https://sample-app.firebaseio.com/users/ada/name/first'
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*
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* @param {string} path A relative path from this location to the desired child
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* location.
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* @return {!firebase.database.Reference} The specified child location.
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*/
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firebase.database.Reference.prototype.child = function(path) {};
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/**
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* The parent location of a `Reference`.
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*
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* The parent of a root `Reference` is `null`.
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*
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* @example
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* // The parent of a root reference is null
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* var rootRef = firebase.database().ref();
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* parent = rootRef.parent; // parent === null
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*
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* @example
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* // The parent of any non-root reference is the parent location
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* var usersRef = firebase.database().ref("users");
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* var adaRef = firebase.database().ref("users/ada");
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* // usersRef and adaRef.parent represent the same location
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*
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* @type {?firebase.database.Reference}
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*/
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firebase.database.Reference.prototype.parent;
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/**
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* The root `Reference` of the Database.
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*
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* @example
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* // The root of a root reference is itself
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* var rootRef = firebase.database().ref();
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* // rootRef and rootRef.root represent the same location
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*
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* @example
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* // The root of any non-root reference is the root location
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* var adaRef = firebase.database().ref("users/ada");
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* // rootRef and adaRef.root represent the same location
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*
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* @type {!firebase.database.Reference}
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*/
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firebase.database.Reference.prototype.root;
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/**
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* @type {string}
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*/
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firebase.database.Reference.prototype.path;
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/**
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* Writes data to this Database location.
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*
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* This will overwrite any data at this location and all child locations.
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*
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* The effect of the write will be visible immediately, and the corresponding
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* events ("value", "child_added", etc.) will be triggered. Synchronization of
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* the data to the Firebase servers will also be started, and the returned
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* Promise will resolve when complete. If provided, the `onComplete` callback
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* will be called asynchronously after synchronization has finished.
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*
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* Passing `null` for the new value is equivalent to calling `remove()`; namely,
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* all data at this location and all child locations will be deleted.
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*
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* `set()` will remove any priority stored at this location, so if priority is
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* meant to be preserved, you need to use `setWithPriority()` instead.
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*
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* Note that modifying data with `set()` will cancel any pending transactions
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* at that location, so extreme care should be taken if mixing `set()` and
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* `transaction()` to modify the same data.
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*
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* A single `set()` will generate a single "value" event at the location where
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* the `set()` was performed.
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*
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* @example
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* var adaNameRef = firebase.database().ref('users/ada/name');
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* adaNameRef.child('first').set('Ada');
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* adaNameRef.child('last').set('Lovelace');
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* // We've written 'Ada' to the Database location storing Ada's first name,
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* // and 'Lovelace' to the location storing her last name.
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*
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* @example
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* adaNameRef.set({ first: 'Ada', last: 'Lovelace' });
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* // Exact same effect as the previous example, except we've written
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* // Ada's first and last name simultaneously.
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*
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* @example
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* adaNameRef.set({ first: 'Ada', last: 'Lovelace' })
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* .then(function() {
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* console.log('Synchronization succeeded');
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* })
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* .catch(function(error) {
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* console.log('Synchronization failed');
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* });
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* // Same as the previous example, except we will also log a message
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* // when the data has finished synchronizing.
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*
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* @param {*} value The value to be written (string, number, boolean, object,
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* array, or null).
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* @param {function(?Error)=} onComplete Callback called when write to server is
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* complete.
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* @return {!firebase.Promise<void>} Resolves when write to server is complete.
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*/
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firebase.database.Reference.prototype.set = function(value, onComplete) {};
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/**
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* Writes multiple values to the Database at once.
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*
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* The `values` argument contains multiple property-value pairs that will be
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* written to the Database together. Each child property can either be a simple
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* property (for example, "name") or a relative path (for example,
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* "name/first") from the current location to the data to update.
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*
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* As opposed to the `set()` method, `update()` can be use to selectively update
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* only the referenced properties at the current location (instead of replacing
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* all the child properties at the current location).
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*
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* The effect of the write will be visible immediately, and the corresponding
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* events ('value', 'child_added', etc.) will be triggered. Synchronization of
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* the data to the Firebase servers will also be started, and the returned
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* Promise will resolve when complete. If provided, the `onComplete` callback
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* will be called asynchronously after synchronization has finished.
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*
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* A single `update()` will generate a single "value" event at the location
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* where the `update()` was performed, regardless of how many children were
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* modified.
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*
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* Note that modifying data with `update()` will cancel any pending
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* transactions at that location, so extreme care should be taken if mixing
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* `update()` and `transaction()` to modify the same data.
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*
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* Passing `null` to `update()` will remove the data at this location.
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*
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* See
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* {@link
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* https://firebase.googleblog.com/2015/09/introducing-multi-location-updates-and_86.html
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* Introducing multi-location updates and more}.
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*
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* @example
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* var adaNameRef = firebase.database().ref('users/ada/name');
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* // Modify the 'first' and 'last' properties, but leave other data at
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* // adaNameRef unchanged.
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* adaNameRef.update({ first: 'Ada', last: 'Lovelace' });
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*
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* @param {!Object} values Object containing multiple values.
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* @param {function(?Error)=} onComplete Callback called when write to server is
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* complete.
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* @return {!firebase.Promise<void>} Resolves when update on server is complete.
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*/
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firebase.database.Reference.prototype.update = function(values, onComplete) {};
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/**
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* Writes data the Database location. Like `set()` but also specifies the
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* priority for that data.
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*
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* Applications need not use priority but can order collections by
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* ordinary properties (see
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* {@link
|
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* https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data
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* Sorting and filtering data}).
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*
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* @param {*} newVal
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* @param {string|number|null} newPriority
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* @param {function(?Error)=} onComplete
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* @return {!firebase.Promise<void>}
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*/
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firebase.database.Reference.prototype.setWithPriority = function(
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newVal,
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newPriority,
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onComplete
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) {};
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|
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/**
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* Removes the data at this Database location.
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*
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* Any data at child locations will also be deleted.
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*
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* The effect of the remove will be visible immediately and the corresponding
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* event 'value' will be triggered. Synchronization of the remove to the
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* Firebase servers will also be started, and the returned Promise will resolve
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* when complete. If provided, the onComplete callback will be called
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* asynchronously after synchronization has finished.
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*
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* @example
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|
* var adaRef = firebase.database().ref('users/ada');
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* adaRef.remove()
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* .then(function() {
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* console.log("Remove succeeded.")
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* })
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* .catch(function(error) {
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* console.log("Remove failed: " + error.message)
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* });
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*
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* @param {function(?Error)=} onComplete Callback called when write to server is
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* complete.
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* @return {!firebase.Promise<void>} Resolves when remove on server is complete.
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*/
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firebase.database.Reference.prototype.remove = function(onComplete) {};
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|
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/**
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* Atomically modifies the data at this location.
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*
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* Atomically modify the data at this location. Unlike a normal `set()`, which
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* just overwrites the data regardless of its previous value, `transaction()` is
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* used to modify the existing value to a new value, ensuring there are no
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* conflicts with other clients writing to the same location at the same time.
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*
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* To accomplish this, you pass `transaction()` an update function which is used
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* to transform the current value into a new value. If another client writes to
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* the location before your new value is successfully written, your update
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* function will be called again with the new current value, and the write will
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* be retried. This will happen repeatedly until your write succeeds without
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* conflict or you abort the transaction by not returning a value from your
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* update function.
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*
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* Note: Modifying data with `set()` will cancel any pending transactions at
|
|
* that location, so extreme care should be taken if mixing `set()` and
|
|
* `transaction()` to update the same data.
|
|
*
|
|
* Note: When using transactions with Security and Firebase Rules in place, be
|
|
* aware that a client needs `.read` access in addition to `.write` access in
|
|
* order to perform a transaction. This is because the client-side nature of
|
|
* transactions requires the client to read the data in order to transactionally
|
|
* update it.
|
|
*
|
|
* @example
|
|
* // Increment Ada's rank by 1.
|
|
* var adaRankRef = firebase.database().ref('users/ada/rank');
|
|
* adaRankRef.transaction(function(currentRank) {
|
|
* // If users/ada/rank has never been set, currentRank will be `null`.
|
|
* return currentRank + 1;
|
|
* });
|
|
*
|
|
* @example
|
|
* // Try to create a user for ada, but only if the user id 'ada' isn't
|
|
* // already taken
|
|
* var adaRef = firebase.database().ref('users/ada');
|
|
* adaRef.transaction(function(currentData) {
|
|
* if (currentData === null) {
|
|
* return { name: { first: 'Ada', last: 'Lovelace' } };
|
|
* } else {
|
|
* console.log('User ada already exists.');
|
|
* return; // Abort the transaction.
|
|
* }
|
|
* }, function(error, committed, snapshot) {
|
|
* if (error) {
|
|
* console.log('Transaction failed abnormally!', error);
|
|
* } else if (!committed) {
|
|
* console.log('We aborted the transaction (because ada already exists).');
|
|
* } else {
|
|
* console.log('User ada added!');
|
|
* }
|
|
* console.log("Ada's data: ", snapshot.val());
|
|
* });
|
|
*
|
|
*
|
|
* @param {function(*): *} transactionUpdate A developer-supplied function which
|
|
* will be passed the current data stored at this location (as a JavaScript
|
|
* object). The function should return the new value it would like written (as
|
|
* a JavaScript object). If `undefined` is returned (i.e. you return with no
|
|
* arguments) the transaction will be aborted and the data at this location
|
|
* will not be modified.
|
|
* @param {(function(?Error, boolean,
|
|
* ?firebase.database.DataSnapshot))=} onComplete A callback
|
|
* function that will be called when the transaction completes. The callback
|
|
* is passed three arguments: a possibly-null `Error`, a `boolean` indicating
|
|
* whether the transaction was committed, and a `DataSnapshot` indicating the
|
|
* final result. If the transaction failed abnormally, the first argument will
|
|
* be an `Error` object indicating the failure cause. If the transaction
|
|
* finished normally, but no data was committed because no data was returned
|
|
* from `transactionUpdate`, then second argument will be false. If the
|
|
* transaction completed and committed data to Firebase, the second argument
|
|
* will be true. Regardless, the third argument will be a `DataSnapshot`
|
|
* containing the resulting data in this location.
|
|
* @param {boolean=} applyLocally By default, events are raised each time the
|
|
* transaction update function runs. So if it is run multiple times, you may
|
|
* see intermediate states. You can set this to false to suppress these
|
|
* intermediate states and instead wait until the transaction has completed
|
|
* before events are raised.
|
|
* @return {!firebase.Promise<{
|
|
* committed: boolean,
|
|
* snapshot: ?firebase.database.DataSnapshot
|
|
* }>} Returns a Promise that can optionally be used instead of the onComplete
|
|
* callback to handle success and failure.
|
|
*/
|
|
firebase.database.Reference.prototype.transaction = function(
|
|
transactionUpdate,
|
|
onComplete,
|
|
applyLocally
|
|
) {};
|
|
|
|
/**
|
|
* Sets a priority for the data at this Database location.
|
|
*
|
|
* Applications need not use priority but can order collections by
|
|
* ordinary properties (see
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data
|
|
* Sorting and filtering data}).
|
|
*
|
|
* @param {string|number|null} priority
|
|
* @param {function(?Error)} onComplete
|
|
* @return {!firebase.Promise<void>}
|
|
*/
|
|
firebase.database.Reference.prototype.setPriority = function(
|
|
priority,
|
|
onComplete
|
|
) {};
|
|
|
|
/**
|
|
* @interface
|
|
* @extends {firebase.database.Reference}
|
|
* @extends {firebase.Thenable<void>}
|
|
*/
|
|
firebase.database.ThenableReference = function() {};
|
|
|
|
/**
|
|
* Generates a new child location using a unique key and returns its
|
|
* `Reference`.
|
|
*
|
|
* This is the most common pattern for adding data to a collection of items.
|
|
*
|
|
* If you provide a value to `push()`, the value will be written to the
|
|
* generated location. If you don't pass a value, nothing will be written to the
|
|
* Database and the child will remain empty (but you can use the `Reference`
|
|
* elsewhere).
|
|
*
|
|
* The unique key generated by `push()` are ordered by the current time, so the
|
|
* resulting list of items will be chronologically sorted. The keys are also
|
|
* designed to be unguessable (they contain 72 random bits of entropy).
|
|
*
|
|
*
|
|
* See
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#append_to_a_list_of_data
|
|
* Append to a list of data}
|
|
* </br>See
|
|
* {@link
|
|
* https://firebase.googleblog.com/2015/02/the-2120-ways-to-ensure-unique_68.html
|
|
* The 2^120 Ways to Ensure Unique Identifiers}
|
|
*
|
|
* @example
|
|
* var messageListRef = firebase.database().ref('message_list');
|
|
* var newMessageRef = messageListRef.push();
|
|
* newMessageRef.set({
|
|
* 'user_id': 'ada',
|
|
* 'text': 'The Analytical Engine weaves algebraical patterns just as the Jacquard loom weaves flowers and leaves.'
|
|
* });
|
|
* // We've appended a new message to the message_list location.
|
|
* var path = newMessageRef.toString();
|
|
* // path will be something like
|
|
* // 'https://sample-app.firebaseio.com/message_list/-IKo28nwJLH0Nc5XeFmj'
|
|
*
|
|
* @param {*=} value Optional value to be written at the generated location.
|
|
* @param {function(?Error)=} onComplete Callback called when write to server is
|
|
* complete.
|
|
* @return {!firebase.database.ThenableReference} Combined `Promise` and
|
|
* `Reference`; resolves when write is complete, but can be used immediately
|
|
* as the `Reference` to the child location.
|
|
*/
|
|
firebase.database.Reference.prototype.push = function(value, onComplete) {};
|
|
|
|
/**
|
|
* Returns an `OnDisconnect` object - see
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/offline-capabilities
|
|
* Enabling Offline Capabilities in JavaScript} for more information on how
|
|
* to use it.
|
|
*
|
|
* @return {!firebase.database.OnDisconnect}
|
|
*/
|
|
firebase.database.Reference.prototype.onDisconnect = function() {};
|
|
|
|
/**
|
|
* A `Query` sorts and filters the data at a Database location so only a subset
|
|
* of the child data is included. This can be used to order a collection of
|
|
* data by some attribute (for example, height of dinosaurs) as well as to
|
|
* restrict a large list of items (for example, chat messages) down to a number
|
|
* suitable for synchronizing to the client. Queries are created by chaining
|
|
* together one or more of the filter methods defined here.
|
|
*
|
|
* Just as with a `Reference`, you can receive data from a `Query` by using the
|
|
* `on()` method. You will only receive events and `DataSnapshot`s for the
|
|
* subset of the data that matches your query.
|
|
*
|
|
* Read our documentation on
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data
|
|
* Sorting and filtering data} for more information.
|
|
*
|
|
* @interface
|
|
*/
|
|
firebase.database.Query = function() {};
|
|
|
|
/**
|
|
* Returns a `Reference` to the `Query`'s location.
|
|
*
|
|
* @type {!firebase.database.Reference}
|
|
*/
|
|
firebase.database.Query.prototype.ref;
|
|
|
|
/**
|
|
* Returns whether or not the current and provided queries represent the same
|
|
* location, have the same query parameters, and are from the same instance of
|
|
* `firebase.app.App`.
|
|
*
|
|
* Two `Reference` objects are equivalent if they represent the same location
|
|
* and are from the same instance of `firebase.app.App`.
|
|
*
|
|
* Two `Query` objects are equivalent if they represent the same location, have
|
|
* the same query parameters, and are from the same instance of
|
|
* `firebase.app.App`. Equivalent queries share the same sort order, limits, and
|
|
* starting and ending points.
|
|
*
|
|
* @example
|
|
* var rootRef = firebase.database.ref();
|
|
* var usersRef = rootRef.child("users");
|
|
*
|
|
* usersRef.isEqual(rootRef); // false
|
|
* usersRef.isEqual(rootRef.child("users")); // true
|
|
* usersRef.parent.isEqual(rootRef); // true
|
|
*
|
|
* @example
|
|
* var rootRef = firebase.database.ref();
|
|
* var usersRef = rootRef.child("users");
|
|
* var usersQuery = usersRef.limitToLast(10);
|
|
*
|
|
* usersQuery.isEqual(usersRef); // false
|
|
* usersQuery.isEqual(usersRef.limitToLast(10)); // true
|
|
* usersQuery.isEqual(rootRef.limitToLast(10)); // false
|
|
* usersQuery.isEqual(usersRef.orderByKey().limitToLast(10)); // false
|
|
*
|
|
* @param {firebase.database.Query} other The query to compare against.
|
|
* @return {boolean} Whether or not the current and provided queries are
|
|
* equivalent.
|
|
*/
|
|
firebase.database.Query.prototype.isEqual = function(other) {};
|
|
|
|
/**
|
|
* Listens for data changes at a particular location.
|
|
*
|
|
* This is the primary way to read data from a Database. Your callback
|
|
* will be triggered for the initial data and again whenever the data changes.
|
|
* Use `off( )` to stop receiving updates. See
|
|
* {@link https://firebase.google.com/docs/database/web/retrieve-data
|
|
* Retrieve Data on the Web}
|
|
* for more details.
|
|
*
|
|
* <h4>value event</h4>
|
|
*
|
|
* This event will trigger once with the initial data stored at this location,
|
|
* and then trigger again each time the data changes. The `DataSnapshot` passed
|
|
* to the callback will be for the location at which `on()` was called. It
|
|
* won't trigger until the entire contents has been synchronized. If the
|
|
* location has no data, it will be triggered with an empty `DataSnapshot`
|
|
* (`val()` will return `null`).
|
|
*
|
|
* <h4>child_added event</h4>
|
|
*
|
|
* This event will be triggered once for each initial child at this location,
|
|
* and it will be triggered again every time a new child is added. The
|
|
* `DataSnapshot` passed into the callback will reflect the data for the
|
|
* relevant child. For ordering purposes, it is passed a second argument which
|
|
* is a string containing the key of the previous sibling child by sort order,
|
|
* or `null` if it is the first child.
|
|
*
|
|
* <h4>child_removed event</h4>
|
|
*
|
|
* This event will be triggered once every time a child is removed. The
|
|
* `DataSnapshot` passed into the callback will be the old data for the child
|
|
* that was removed. A child will get removed when either:
|
|
*
|
|
* - a client explicitly calls `remove()` on that child or one of its ancestors
|
|
* - a client calls `set(null)` on that child or one of its ancestors
|
|
* - that child has all of its children removed
|
|
* - there is a query in effect which now filters out the child (because it's
|
|
* sort order changed or the max limit was hit)
|
|
*
|
|
* <h4>child_changed event</h4>
|
|
*
|
|
* This event will be triggered when the data stored in a child (or any of its
|
|
* descendants) changes. Note that a single `child_changed` event may represent
|
|
* multiple changes to the child. The `DataSnapshot` passed to the callback will
|
|
* contain the new child contents. For ordering purposes, the callback is also
|
|
* passed a second argument which is a string containing the key of the previous
|
|
* sibling child by sort order, or `null` if it is the first child.
|
|
*
|
|
* <h4>child_moved event</h4>
|
|
*
|
|
* This event will be triggered when a child's sort order changes such that its
|
|
* position relative to its siblings changes. The `DataSnapshot` passed to the
|
|
* callback will be for the data of the child that has moved. It is also passed
|
|
* a second argument which is a string containing the key of the previous
|
|
* sibling child by sort order, or `null` if it is the first child.
|
|
*
|
|
* @example <caption>Handle a new value:</caption>
|
|
* ref.on('value', function(dataSnapshot) {
|
|
* ...
|
|
* });
|
|
*
|
|
* @example <caption>Handle a new child:</caption>
|
|
* ref.on('child_added', function(childSnapshot, prevChildKey) {
|
|
* ...
|
|
* });
|
|
*
|
|
* @example <caption>Handle child removal:</caption>
|
|
* ref.on('child_removed', function(oldChildSnapshot) {
|
|
* ...
|
|
* });
|
|
*
|
|
* @example <caption>Handle child data changes:</caption>
|
|
* ref.on('child_changed', function(childSnapshot, prevChildKey) {
|
|
* ...
|
|
* });
|
|
*
|
|
* @example <caption>Handle child ordering changes:</caption>
|
|
* ref.on('child_moved', function(childSnapshot, prevChildKey) {
|
|
* ...
|
|
* });
|
|
*
|
|
* @param {string} eventType One of the following strings: "value",
|
|
* "child_added", "child_changed", "child_removed", or "child_moved."
|
|
* @param {!function(firebase.database.DataSnapshot, string=)} callback A
|
|
* callback that fires when the specified event occurs. The callback will be
|
|
* passed a DataSnapshot. For ordering purposes, "child_added",
|
|
* "child_changed", and "child_moved" will also be passed a string containing
|
|
* the key of the previous child, by sort order, or `null` if it is the
|
|
* first child.
|
|
* @param {(function(Error)|Object)=} cancelCallbackOrContext An optional
|
|
* callback that will be notified if your event subscription is ever canceled
|
|
* because your client does not have permission to read this data (or it had
|
|
* permission but has now lost it). This callback will be passed an `Error`
|
|
* object indicating why the failure occurred.
|
|
* @param {Object=} context If provided, this object will be used as `this`
|
|
* when calling your callback(s).
|
|
* @return {!function(firebase.database.DataSnapshot, string=)} The provided
|
|
* callback function is returned unmodified. This is just for convenience if
|
|
* you want to pass an inline function to `on()` but store the callback
|
|
* function for later passing to `off()`.
|
|
*/
|
|
firebase.database.Query.prototype.on = function(
|
|
eventType,
|
|
callback,
|
|
cancelCallbackOrContext,
|
|
context
|
|
) {};
|
|
|
|
/**
|
|
* Detaches a callback previously attached with `on()`.
|
|
*
|
|
* Detach a callback previously attached with `on()`. Note that if `on()` was
|
|
* called multiple times with the same eventType and callback, the callback
|
|
* will be called multiple times for each event, and `off()` must be called
|
|
* multiple times to remove the callback. Calling `off()` on a parent listener
|
|
* will not automatically remove listeners registered on child nodes, `off()`
|
|
* must also be called on any child listeners to remove the callback.
|
|
*
|
|
* If a callback is not specified, all callbacks for the specified eventType
|
|
* will be removed. Similarly, if no eventType or callback is specified, all
|
|
* callbacks for the `Reference` will be removed.
|
|
*
|
|
* @example
|
|
* var onValueChange = function(dataSnapshot) { ... };
|
|
* ref.on('value', onValueChange);
|
|
* ref.child('meta-data').on('child_added', onChildAdded);
|
|
* // Sometime later...
|
|
* ref.off('value', onValueChange);
|
|
*
|
|
* // You must also call off() for any child listeners on ref
|
|
* // to cancel those callbacks
|
|
* ref.child('meta-data').off('child_added', onValueAdded);
|
|
*
|
|
* @example
|
|
* // Or you can save a line of code by using an inline function
|
|
* // and on()'s return value.
|
|
* var onValueChange = ref.on('value', function(dataSnapshot) { ... });
|
|
* // Sometime later...
|
|
* ref.off('value', onValueChange);
|
|
*
|
|
* @param {string=} eventType One of the following strings: "value",
|
|
* "child_added", "child_changed", "child_removed", or "child_moved."
|
|
* @param {function(!firebase.database.DataSnapshot, ?string=)=} callback The
|
|
* callback function that was passed to `on()`.
|
|
* @param {Object=} context The context that was passed to `on()`.
|
|
*/
|
|
firebase.database.Query.prototype.off = function(
|
|
eventType,
|
|
callback,
|
|
context
|
|
) {};
|
|
|
|
/**
|
|
* Listens for exactly one event of the specified event type, and then stops
|
|
* listening.
|
|
*
|
|
* This is equivalent to calling {@link firebase.database.Query#on `on()`}, and
|
|
* then calling {@link firebase.database.Query#off `off()`} inside the callback
|
|
* function. See {@link firebase.database.Query#on `on()`} for details on the
|
|
* event types.
|
|
*
|
|
* @example
|
|
* // Basic usage of .once() to read the data located at ref.
|
|
* ref.once('value')
|
|
* .then(function(dataSnapshot) {
|
|
* // handle read data.
|
|
* });
|
|
*
|
|
* @param {string} eventType One of the following strings: "value",
|
|
* "child_added", "child_changed", "child_removed", or "child_moved."
|
|
* @param {function(!firebase.database.DataSnapshot, string=)=} successCallback A
|
|
* callback that fires when the specified event occurs. The callback will be
|
|
* passed a DataSnapshot. For ordering purposes, "child_added",
|
|
* "child_changed", and "child_moved" will also be passed a string containing
|
|
* the key of the previous child by sort order, or `null` if it is the
|
|
* first child.
|
|
* @param {(function(Error)|Object)=} failureCallbackOrContext An optional
|
|
* callback that will be notified if your client does not have permission to
|
|
* read the data. This callback will be passed an `Error` object indicating
|
|
* why the failure occurred.
|
|
* @param {Object=} context If provided, this object will be used as `this`
|
|
* when calling your callback(s).
|
|
* @return {!firebase.Promise<*>}
|
|
*/
|
|
firebase.database.Query.prototype.once = function(
|
|
eventType,
|
|
successCallback,
|
|
failureCallbackOrContext,
|
|
context
|
|
) {};
|
|
|
|
/**
|
|
* Generates a new `Query` limited to the first specific number of children.
|
|
*
|
|
* The `limitToFirst()` method is used to set a maximum number of children to be
|
|
* synced for a given callback. If we set a limit of 100, we will initially only
|
|
* receive up to 100 `child_added` events. If we have fewer than 100 messages
|
|
* stored in our Database, a `child_added` event will fire for each message.
|
|
* However, if we have over 100 messages, we will only receive a `child_added`
|
|
* event for the first 100 ordered messages. As items change, we will receive
|
|
* `child_removed` events for each item that drops out of the active list so
|
|
* that the total number stays at 100.
|
|
*
|
|
* You can read more about `limitToFirst()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#filtering_data
|
|
* Filtering data}.
|
|
*
|
|
* @example
|
|
* // Find the two shortest dinosaurs.
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByChild("height").limitToFirst(2).on("child_added", function(snapshot) {
|
|
* // This will be called exactly two times (unless there are less than two
|
|
* // dinosaurs in the Database).
|
|
*
|
|
* // It will also get fired again if one of the first two dinosaurs is
|
|
* // removed from the data set, as a new dinosaur will now be the second
|
|
* // shortest.
|
|
* console.log(snapshot.key);
|
|
* });
|
|
*
|
|
* @param {number} limit The maximum number of nodes to include in this query.
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.limitToFirst = function(limit) {};
|
|
|
|
/**
|
|
* Generates a new `Query` object limited to the last specific number of
|
|
* children.
|
|
*
|
|
* The `limitToLast()` method is used to set a maximum number of children to be
|
|
* synced for a given callback. If we set a limit of 100, we will initially only
|
|
* receive up to 100 `child_added` events. If we have fewer than 100 messages
|
|
* stored in our Database, a `child_added` event will fire for each message.
|
|
* However, if we have over 100 messages, we will only receive a `child_added`
|
|
* event for the last 100 ordered messages. As items change, we will receive
|
|
* `child_removed` events for each item that drops out of the active list so
|
|
* that the total number stays at 100.
|
|
*
|
|
* You can read more about `limitToLast()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#filtering_data
|
|
* Filtering data}.
|
|
*
|
|
* @example
|
|
* // Find the two heaviest dinosaurs.
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByChild("weight").limitToLast(2).on("child_added", function(snapshot) {
|
|
* // This callback will be triggered exactly two times, unless there are
|
|
* // fewer than two dinosaurs stored in the Database. It will also get fired
|
|
* // for every new, heavier dinosaur that gets added to the data set.
|
|
* console.log(snapshot.key);
|
|
* });
|
|
*
|
|
* @param {number} limit The maximum number of nodes to include in this query.
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.limitToLast = function(limit) {};
|
|
|
|
/**
|
|
* Generates a new `Query` object ordered by the specified child key.
|
|
*
|
|
* Queries can only order by one key at a time. Calling `orderByChild()`
|
|
* multiple times on the same query is an error.
|
|
*
|
|
* Firebase queries allow you to order your data by any child key on the fly.
|
|
* However, if you know in advance what your indexes will be, you can define
|
|
* them via the .indexOn rule in your Security Rules for better performance. See
|
|
* the {@link https://firebase.google.com/docs/database/security/indexing-data
|
|
* .indexOn} rule for more information.
|
|
*
|
|
* You can read more about `orderByChild()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sort_data
|
|
* Sort data}.
|
|
*
|
|
* @example
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByChild("height").on("child_added", function(snapshot) {
|
|
* console.log(snapshot.key + " was " + snapshot.val().height + " m tall");
|
|
* });
|
|
*
|
|
* @param {string} path
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.orderByChild = function(path) {};
|
|
|
|
/**
|
|
* Generates a new `Query` object ordered by key.
|
|
*
|
|
* Sorts the results of a query by their (ascending) key values.
|
|
*
|
|
* You can read more about `orderByKey()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sort_data
|
|
* Sort data}.
|
|
*
|
|
* @example
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByKey().on("child_added", function(snapshot) {
|
|
* console.log(snapshot.key);
|
|
* });
|
|
*
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.orderByKey = function() {};
|
|
|
|
/**
|
|
* Generates a new `Query` object ordered by priority.
|
|
*
|
|
* Applications need not use priority but can order collections by
|
|
* ordinary properties (see
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sort_data
|
|
* Sort data} for alternatives to priority.
|
|
*
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.orderByPriority = function() {};
|
|
|
|
/**
|
|
* Generates a new `Query` object ordered by value.
|
|
*
|
|
* If the children of a query are all scalar values (string, number, or
|
|
* boolean), you can order the results by their (ascending) values.
|
|
*
|
|
* You can read more about `orderByValue()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sort_data
|
|
* Sort data}.
|
|
*
|
|
* @example
|
|
* var scoresRef = firebase.database().ref("scores");
|
|
* scoresRef.orderByValue().limitToLast(3).on("value", function(snapshot) {
|
|
* snapshot.forEach(function(data) {
|
|
* console.log("The " + data.key + " score is " + data.val());
|
|
* });
|
|
* });
|
|
*
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.orderByValue = function() {};
|
|
|
|
/**
|
|
* Creates a `Query` with the specified starting point.
|
|
*
|
|
* Using `startAt()`, `endAt()`, and `equalTo()` allows you to choose arbitrary
|
|
* starting and ending points for your queries.
|
|
*
|
|
* The starting point is inclusive, so children with exactly the specified value
|
|
* will be included in the query. The optional key argument can be used to
|
|
* further limit the range of the query. If it is specified, then children that
|
|
* have exactly the specified value must also have a key name greater than or
|
|
* equal to the specified key.
|
|
*
|
|
* You can read more about `startAt()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#filtering_data
|
|
* Filtering data}.
|
|
*
|
|
* @example
|
|
* // Find all dinosaurs that are at least three meters tall.
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByChild("height").startAt(3).on("child_added", function(snapshot) {
|
|
* console.log(snapshot.key)
|
|
* });
|
|
*
|
|
* @param {number|string|boolean|null} value The value to start at. The argument
|
|
* type depends on which `orderBy*()` function was used in this query.
|
|
* Specify a value that matches the `orderBy*()` type. When used in
|
|
* combination with `orderByKey()`, the value must be a string.
|
|
* @param {string=} key The child key to start at. This argument is only allowed
|
|
* if ordering by child, value, or priority.
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.startAt = function(value, key) {};
|
|
|
|
/**
|
|
* Creates a `Query` with the specified ending point.
|
|
*
|
|
* Using `startAt()`, `endAt()`, and `equalTo()` allows you to choose arbitrary
|
|
* starting and ending points for your queries.
|
|
*
|
|
* The ending point is inclusive, so children with exactly the specified value
|
|
* will be included in the query. The optional key argument can be used to
|
|
* further limit the range of the query. If it is specified, then children that
|
|
* have exactly the specified value must also have a key name less than or equal
|
|
* to the specified key.
|
|
*
|
|
* You can read more about `endAt()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#filtering_data
|
|
* Filtering data}.
|
|
*
|
|
* @example
|
|
* // Find all dinosaurs whose names come before Pterodactyl lexicographically.
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByKey().endAt("pterodactyl").on("child_added", function(snapshot) {
|
|
* console.log(snapshot.key);
|
|
* });
|
|
*
|
|
* @param {number|string|boolean|null} value The value to end at. The argument
|
|
* type depends on which `orderBy*()` function was used in this query.
|
|
* Specify a value that matches the `orderBy*()` type. When used in
|
|
* combination with `orderByKey()`, the value must be a string.
|
|
* @param {string=} key The child key to end at, among the children with the
|
|
* previously specified priority. This argument is only allowed if ordering by
|
|
* child, value, or priority.
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.endAt = function(value, key) {};
|
|
|
|
/**
|
|
* Creates a `Query` that includes children that match the specified value.
|
|
*
|
|
* Using `startAt()`, `endAt()`, and `equalTo()` allows us to choose arbitrary
|
|
* starting and ending points for our queries.
|
|
*
|
|
* The optional key argument can be used to further limit the range of the
|
|
* query. If it is specified, then children that have exactly the specified
|
|
* value must also have exactly the specified key as their key name. This can be
|
|
* used to filter result sets with many matches for the same value.
|
|
*
|
|
* You can read more about `equalTo()` in
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#filtering_data
|
|
* Filtering data}.
|
|
*
|
|
* @example
|
|
* // Find all dinosaurs whose height is exactly 25 meters.
|
|
* var ref = firebase.database().ref("dinosaurs");
|
|
* ref.orderByChild("height").equalTo(25).on("child_added", function(snapshot) {
|
|
* console.log(snapshot.key);
|
|
* });
|
|
*
|
|
* @param {number|string|boolean|null} value The value to match for. The
|
|
* argument type depends on which `orderBy*()` function was used in this
|
|
* query. Specify a value that matches the `orderBy*()` type. When used in
|
|
* combination with `orderByKey()`, the value must be a string.
|
|
* @param {string=} key The child key to start at, among the children with the
|
|
* previously specified priority. This argument is only allowed if ordering by
|
|
* child, value, or priority.
|
|
* @return {!firebase.database.Query}
|
|
*/
|
|
firebase.database.Query.prototype.equalTo = function(value, key) {};
|
|
|
|
/**
|
|
* Gets the absolute URL for this location.
|
|
*
|
|
* The `toString()` method returns a URL that is ready to be put into a browser,
|
|
* curl command, or a `firebase.database().refFromURL()` call. Since all of
|
|
* those expect the URL to be url-encoded, `toString()` returns an encoded URL.
|
|
*
|
|
* Append '.json' to the returned URL when typed into a browser to download
|
|
* JSON-formatted data. If the location is secured (that is, not publicly
|
|
* readable), you will get a permission-denied error.
|
|
*
|
|
* @example
|
|
* // Calling toString() on a root Firebase reference returns the URL where its
|
|
* // data is stored within the Database:
|
|
* var rootRef = firebase.database().ref();
|
|
* var rootUrl = rootRef.toString();
|
|
* // rootUrl === "https://sample-app.firebaseio.com/".
|
|
*
|
|
* // Calling toString() at a deeper Firebase reference returns the URL of that
|
|
* // deep path within the Database:
|
|
* var adaRef = rootRef.child('users/ada');
|
|
* var adaURL = adaRef.toString();
|
|
* // adaURL === "https://sample-app.firebaseio.com/users/ada".
|
|
*
|
|
* @return {string} The absolute URL for this location.
|
|
* @override
|
|
*/
|
|
firebase.database.Query.prototype.toString = function() {};
|
|
|
|
/**
|
|
* Returns a JSON-serializable representation of this object.
|
|
*
|
|
* @return {!Object} A JSON-serializable representation of this object.
|
|
*/
|
|
firebase.database.Query.prototype.toJSON = function() {};
|
|
|
|
/**
|
|
* A `DataSnapshot` contains data from a Database location.
|
|
*
|
|
* Any time you read data from the Database, you receive the data as a
|
|
* `DataSnapshot`. A `DataSnapshot` is passed to the event callbacks you attach
|
|
* with `on()` or `once()`. You can extract the contents of the snapshot as a
|
|
* JavaScript object by calling the `val()` method. Alternatively, you can
|
|
* traverse into the snapshot by calling `child()` to return child snapshots
|
|
* (which you could then call `val()` on).
|
|
*
|
|
* A `DataSnapshot` is an efficiently generated, immutable copy of the data at
|
|
* a Database location. It cannot be modified and will never change (to modify
|
|
* data, you always call the `set()` method on a `Reference` directly).
|
|
*
|
|
* @interface
|
|
*/
|
|
firebase.database.DataSnapshot = function() {};
|
|
|
|
/**
|
|
* Extracts a JavaScript value from a `DataSnapshot`.
|
|
*
|
|
* Depending on the data in a `DataSnapshot`, the `val()` method may return a
|
|
* scalar type (string, number, or boolean), an array, or an object. It may also
|
|
* return null, indicating that the `DataSnapshot` is empty (contains no data).
|
|
*
|
|
* @example
|
|
* // Write and then read back a string from the Database.
|
|
* ref.set("hello")
|
|
* .then(function() {
|
|
* return ref.once("value");
|
|
* })
|
|
* .then(function(snapshot) {
|
|
* var data = snapshot.val(); // data === "hello"
|
|
* });
|
|
*
|
|
* @example
|
|
* // Write and then read back a JavaScript object from the Database.
|
|
* ref.set({ name: "Ada", age: 36 })
|
|
* .then(function() {
|
|
* return ref.once("value");
|
|
* })
|
|
* .then(function(snapshot) {
|
|
* var data = snapshot.val();
|
|
* // data is { "name": "Ada", "age": 36 }
|
|
* // data.name === "Ada"
|
|
* // data.age === 36
|
|
* });
|
|
*
|
|
* @return {*} The DataSnapshot's contents as a JavaScript value (Object,
|
|
* Array, string, number, boolean, or `null`).
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.val = function() {};
|
|
|
|
/**
|
|
* Exports the entire contents of the DataSnapshot as a JavaScript object.
|
|
*
|
|
* The `exportVal()` method is similar to `val()`, except priority information
|
|
* is included (if available), making it suitable for backing up your data.
|
|
*
|
|
* @return {*} The DataSnapshot's contents as a JavaScript value (Object,
|
|
* Array, string, number, boolean, or `null`).
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.exportVal = function() {};
|
|
|
|
/**
|
|
* Returns true if this `DataSnapshot` contains any data. It is slightly more
|
|
* efficient than using `snapshot.val() !== null`.
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* // Test for the existence of certain keys within a DataSnapshot
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var a = snapshot.exists(); // true
|
|
* var b = snapshot.child("name").exists(); // true
|
|
* var c = snapshot.child("name/first").exists(); // true
|
|
* var d = snapshot.child("name/middle").exists(); // false
|
|
* });
|
|
*
|
|
* @return {boolean}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.exists = function() {};
|
|
|
|
/**
|
|
* Gets another `DataSnapshot` for the location at the specified relative path.
|
|
*
|
|
* Passing a relative path to the `child()` method of a DataSnapshot returns
|
|
* another `DataSnapshot` for the location at the specified relative path. The
|
|
* relative path can either be a simple child name (for example, "ada") or a
|
|
* deeper, slash-separated path (for example, "ada/name/first"). If the child
|
|
* location has no data, an empty `DataSnapshot` (that is, a `DataSnapshot`
|
|
* whose value is `null`) is returned.
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* // Test for the existence of certain keys within a DataSnapshot
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var name = snapshot.child("name").val(); // {first:"Ada",last:"Lovelace"}
|
|
* var firstName = snapshot.child("name/first").val(); // "Ada"
|
|
* var lastName = snapshot.child("name").child("last").val(); // "Lovelace"
|
|
* var age = snapshot.child("age").val(); // null
|
|
* });
|
|
*
|
|
* @param {string} path A relative path to the location of child data.
|
|
* @return {!firebase.database.DataSnapshot}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.child = function(path) {};
|
|
|
|
/**
|
|
* Returns true if the specified child path has (non-null) data.
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* // Determine which child keys in DataSnapshot have data.
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var hasName = snapshot.hasChild("name"); // true
|
|
* var hasAge = snapshot.hasChild("age"); // false
|
|
* });
|
|
*
|
|
* @param {string} path A relative path to the location of a potential child.
|
|
* @return {boolean} `true` if data exists at the specified child path; else
|
|
* `false`.
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.hasChild = function(path) {};
|
|
|
|
/**
|
|
* Gets the priority value of the data in this `DataSnapshot`.
|
|
*
|
|
* Applications need not use priority but can order collections by
|
|
* ordinary properties (see
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data
|
|
* Sorting and filtering data}).
|
|
*
|
|
* @return {string|number|null}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.getPriority = function() {};
|
|
|
|
/**
|
|
* Enumerates the top-level children in the `DataSnapshot`.
|
|
*
|
|
* Because of the way JavaScript objects work, the ordering of data in the
|
|
* JavaScript object returned by `val()` is not guaranteed to match the ordering
|
|
* on the server nor the ordering of `child_added` events. That is where
|
|
* `forEach()` comes in handy. It guarantees the children of a `DataSnapshot`
|
|
* will be iterated in their query order.
|
|
*
|
|
* If no explicit `orderBy*()` method is used, results are returned
|
|
* ordered by key (unless priorities are used, in which case, results are
|
|
* returned by priority).
|
|
*
|
|
* @example
|
|
*
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "users": {
|
|
* "ada": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* },
|
|
* "alan": {
|
|
* "first": "Alan",
|
|
* "last": "Turing"
|
|
* }
|
|
* }
|
|
* }
|
|
*
|
|
* // Loop through users in order with the forEach() method. The callback
|
|
* // provided to forEach() will be called synchronously with a DataSnapshot
|
|
* // for each child:
|
|
* var query = firebase.database().ref("users").orderByKey();
|
|
* query.once("value")
|
|
* .then(function(snapshot) {
|
|
* snapshot.forEach(function(childSnapshot) {
|
|
* // key will be "ada" the first time and "alan" the second time
|
|
* var key = childSnapshot.key;
|
|
* // childData will be the actual contents of the child
|
|
* var childData = childSnapshot.val();
|
|
* });
|
|
* });
|
|
*
|
|
* @example
|
|
* // You can cancel the enumeration at any point by having your callback
|
|
* // function return true. For example, the following code sample will only
|
|
* // fire the callback function one time:
|
|
* var query = firebase.database().ref("users").orderByKey();
|
|
* query.once("value")
|
|
* .then(function(snapshot) {
|
|
* snapshot.forEach(function(childSnapshot) {
|
|
* var key = childSnapshot.key; // "ada"
|
|
*
|
|
* // Cancel enumeration
|
|
* return true;
|
|
* });
|
|
* });
|
|
*
|
|
* @param {function(!firebase.database.DataSnapshot): boolean} action A function
|
|
* that will be called for each child DataSnapshot. The callback can return
|
|
* true to cancel further enumeration.
|
|
* @return {boolean} true if enumeration was canceled due to your callback
|
|
* returning true.
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.forEach = function(action) {};
|
|
|
|
/**
|
|
* Returns whether or not the `DataSnapshot` has any non-`null` child
|
|
* properties.
|
|
*
|
|
* You can use `hasChildren()` to determine if a `DataSnapshot` has any
|
|
* children. If it does, you can enumerate them using `forEach()`. If it
|
|
* doesn't, then either this snapshot contains a primitive value (which can be
|
|
* retrieved with `val()`) or it is empty (in which case, `val()` will return
|
|
* `null`).
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var a = snapshot.hasChildren(); // true
|
|
* var b = snapshot.child("name").hasChildren(); // true
|
|
* var c = snapshot.child("name/first").hasChildren(); // false
|
|
* });
|
|
*
|
|
* @return {boolean} true if this snapshot has any children; else false.
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.hasChildren = function() {};
|
|
|
|
/**
|
|
* The key (last part of the path) of the location of this `DataSnapshot`.
|
|
*
|
|
* The last token in a Database location is considered its key. For example,
|
|
* "ada" is the key for the /users/ada/ node. Accessing the key on any
|
|
* `DataSnapshot` will return the key for the location that generated it.
|
|
* However, accessing the key on the root URL of a Database will return `null`.
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var key = snapshot.key; // "ada"
|
|
* var childKey = snapshot.child("name/last").key; // "last"
|
|
* });
|
|
*
|
|
* @example
|
|
* var rootRef = firebase.database().ref();
|
|
* rootRef.once("value")
|
|
* .then(function(snapshot) {
|
|
* var key = snapshot.key; // null
|
|
* var childKey = snapshot.child("users/ada").key; // "ada"
|
|
* });
|
|
*
|
|
* @type {string|null}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.key;
|
|
|
|
/**
|
|
* Returns the number of child properties of this `DataSnapshot`.
|
|
*
|
|
* @example
|
|
* // Assume we have the following data in the Database:
|
|
* {
|
|
* "name": {
|
|
* "first": "Ada",
|
|
* "last": "Lovelace"
|
|
* }
|
|
* }
|
|
*
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.once("value")
|
|
* .then(function(snapshot) {
|
|
* var a = snapshot.numChildren(); // 1 ("name")
|
|
* var b = snapshot.child("name").numChildren(); // 2 ("first", "last")
|
|
* var c = snapshot.child("name/first").numChildren(); // 0
|
|
* });
|
|
*
|
|
* @return {number}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.numChildren = function() {};
|
|
|
|
/**
|
|
* The `Reference` for the location that generated this `DataSnapshot`.
|
|
*
|
|
* @type {!firebase.database.Reference}
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.ref;
|
|
|
|
/**
|
|
* Returns a JSON-serializable representation of this object.
|
|
*
|
|
* @return {?Object} A JSON-serializable representation of this object.
|
|
*/
|
|
firebase.database.DataSnapshot.prototype.toJSON = function() {};
|
|
|
|
/**
|
|
* The `onDisconnect` class allows you to write or clear data when your client
|
|
* disconnects from the Database server. These updates occur whether your
|
|
* client disconnects cleanly or not, so you can rely on them to clean up data
|
|
* even if a connection is dropped or a client crashes.
|
|
*
|
|
* The `onDisconnect` class is most commonly used to manage presence in
|
|
* applications where it is useful to detect how many clients are connected and
|
|
* when other clients disconnect. See
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/offline-capabilities
|
|
* Enabling Offline Capabilities in JavaScript} for more information.
|
|
*
|
|
* To avoid problems when a connection is dropped before the requests can be
|
|
* transferred to the Database server, these functions should be called before
|
|
* writing any data.
|
|
*
|
|
* Note that `onDisconnect` operations are only triggered once. If you want an
|
|
* operation to occur each time a disconnect occurs, you'll need to re-establish
|
|
* the `onDisconnect` operations each time you reconnect.
|
|
*
|
|
* @interface
|
|
*/
|
|
firebase.database.OnDisconnect = function() {};
|
|
|
|
/**
|
|
* Cancels all previously queued `onDisconnect()` set or update events for this
|
|
* location and all children.
|
|
*
|
|
* If a write has been queued for this location via a `set()` or `update()` at a
|
|
* parent location, the write at this location will be canceled, though writes
|
|
* to sibling locations will still occur.
|
|
*
|
|
* @example
|
|
* var ref = firebase.database().ref("onlineState");
|
|
* ref.onDisconnect().set(false);
|
|
* // ... sometime later
|
|
* ref.onDisconnect().cancel();
|
|
*
|
|
* @param {function(?Error)=} onComplete An optional callback function that will
|
|
* be called when synchronization to the server has completed. The callback
|
|
* will be passed a single parameter: null for success, or an Error object
|
|
* indicating a failure.
|
|
* @return {!firebase.Promise<void>} Resolves when synchronization to the server
|
|
* is complete.
|
|
*/
|
|
firebase.database.OnDisconnect.prototype.cancel = function(onComplete) {};
|
|
|
|
/**
|
|
* Ensures the data at this location is deleted when the client is disconnected
|
|
* (due to closing the browser, navigating to a new page, or network issues).
|
|
*
|
|
* @param {function(?Error)=} onComplete An optional callback function that will
|
|
* be called when synchronization to the server has completed. The callback
|
|
* will be passed a single parameter: null for success, or an Error object
|
|
* indicating a failure.
|
|
* @return {!firebase.Promise<void>} Resolves when synchronization to the server
|
|
* is complete.
|
|
*/
|
|
firebase.database.OnDisconnect.prototype.remove = function(onComplete) {};
|
|
|
|
/**
|
|
* Ensures the data at this location is set to the specified value when the
|
|
* client is disconnected (due to closing the browser, navigating to a new page,
|
|
* or network issues).
|
|
*
|
|
* `set()` is especially useful for implementing "presence" systems, where a
|
|
* value should be changed or cleared when a user disconnects so that they
|
|
* appear "offline" to other users. See
|
|
* {@link
|
|
* https://firebase.google.com/docs/database/web/offline-capabilities
|
|
* Enabling Offline Capabilities in JavaScript} for more information.
|
|
*
|
|
* Note that `onDisconnect` operations are only triggered once. If you want an
|
|
* operation to occur each time a disconnect occurs, you'll need to re-establish
|
|
* the `onDisconnect` operations each time.
|
|
*
|
|
* @example
|
|
* var ref = firebase.database().ref("users/ada/status");
|
|
* ref.onDisconnect().set("I disconnected!");
|
|
*
|
|
* @param {*} value The value to be written to this location on
|
|
* disconnect (can be an object, array, string, number, boolean, or null).
|
|
* @param {function(?Error)=} onComplete An optional callback function that
|
|
* will be called when synchronization to the Database server has completed.
|
|
* The callback will be passed a single parameter: null for success, or an
|
|
* `Error` object indicating a failure.
|
|
* @return {!firebase.Promise<void>} Resolves when synchronization to the
|
|
* Database is complete.
|
|
*/
|
|
firebase.database.OnDisconnect.prototype.set = function(value, onComplete) {};
|
|
|
|
/**
|
|
* Ensures the data at this location is set to the specified value and priority
|
|
* when the client is disconnected (due to closing the browser, navigating to a
|
|
* new page, or network issues).
|
|
*
|
|
* @param {*} value
|
|
* @param {number|string|null} priority
|
|
* @param {function(?Error)=} onComplete
|
|
* @return {!firebase.Promise<void>}
|
|
*/
|
|
firebase.database.OnDisconnect.prototype.setWithPriority = function(
|
|
value,
|
|
priority,
|
|
onComplete
|
|
) {};
|
|
|
|
/**
|
|
* Writes multiple values at this location when the client is disconnected (due
|
|
* to closing the browser, navigating to a new page, or network issues).
|
|
*
|
|
* The `values` argument contains multiple property-value pairs that will be
|
|
* written to the Database together. Each child property can either be a simple
|
|
* property (for example, "name") or a relative path (for example, "name/first")
|
|
* from the current location to the data to update.
|
|
*
|
|
* As opposed to the `set()` method, `update()` can be use to selectively update
|
|
* only the referenced properties at the current location (instead of replacing
|
|
* all the child properties at the current location).
|
|
*
|
|
* See more examples using the connected version of
|
|
* {@link firebase.database.Reference#update `update()`}.
|
|
*
|
|
* @example
|
|
* var ref = firebase.database().ref("users/ada");
|
|
* ref.update({
|
|
* onlineState: true,
|
|
* status: "I'm online."
|
|
* });
|
|
* ref.onDisconnect().update({
|
|
* onlineState: false,
|
|
* status: "I'm offline."
|
|
* });
|
|
*
|
|
* @param {!Object} values Object containing multiple values.
|
|
* @param {function(?Error)=} onComplete An optional callback function that will
|
|
* be called when synchronization to the server has completed. The
|
|
* callback will be passed a single parameter: null for success, or an Error
|
|
* object indicating a failure.
|
|
* @return {!firebase.Promise<void>} Resolves when synchronization to the
|
|
* Database is complete.
|
|
*/
|
|
firebase.database.OnDisconnect.prototype.update = function(
|
|
values,
|
|
onComplete
|
|
) {};
|