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bower_components/google-apis/google-client-loader.html 6.58 KB
73bcce88   luigser   COMPONENTS
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  <!--
  Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  This code may only be used under the BSD style license found at https://polymer.github.io/LICENSE.txt
  The complete set of authors may be found at https://polymer.github.io/AUTHORS.txt
  The complete set of contributors may be found at https://polymer.github.io/CONTRIBUTORS.txt
  Code distributed by Google as part of the polymer project is also
  subject to an additional IP rights grant found at https://polymer.github.io/PATENTS.txt
  -->
  
  <link rel="import" href="../polymer/polymer.html">
  <link rel="import" href="google-js-api.html">
  
  <!--
  Element for loading a specific client Google API with the JavaScript client library.
  
  For loading `gapi.client` libraries
  
  ##### Example
  
      <google-client-loader id="shortener"
        name="urlshortener"
        version="v1"></google-client-loader>
  
      <script>
        var shortener = document.getElementById('shortener');
        shortener.addEventListener('google-api-load', function(event) {
          var request = shortener.api.url.get({
             shortUrl: 'http://goo.gl/fbsS'
          });
          request.execute(function(resp) {
            console.log(resp);
          });
        });
      </script>
  
  @demo
  -->
  <dom-module id="google-client-loader">
    <template>
      <google-js-api on-js-api-load="_loadClient"></google-js-api>
    </template>
  </dom-module>
  
  <script>
    (function() {
      'use strict';
  
      // Stores whether the API client is done loading.
      var _clientLoaded = false;
  
      // Loaders and loading statuses for all APIs, indexed by API name.
      // This helps prevent multiple loading requests being fired at the same time
      // by multiple google-api-loader elements.
      var _statuses = {};
      var _loaders = {};
  
      Polymer({
  
        is: 'google-client-loader',
  
        /**
         * Fired when the requested API is loaded. Override this name
         * by setting `successEventName`.
         * @event google-api-load
         */
  
        /**
         * Fired if an error occurs while loading the requested API. Override this name
         * by setting `errorEventName`.
         * @event google-api-load-error
         */
  
        properties: {
          /**
           * Name of the API to load, e.g. 'urlshortener'.
           *
           * You can find the full list of APIs on the
           * <a href="https://developers.google.com/apis-explorer"> Google APIs
           * Explorer</a>.
           * @required
           */
          name: String,
  
          /**
           * Version of the API to load, e.g. 'v1'.
           * @required
           */
          version: String,
  
          /**
           * App Engine application ID for loading a Google Cloud Endpoints API.
           */
          appId: String,
  
          /**
           * Root URL where to load the API from, e.g. 'http://host/apis'.
           * For App Engine dev server this would be something like:
           * 'http://localhost:8080/_ah/api'.
           * Overrides 'appId' if both are specified.
           */
          apiRoot: String,
  
          /**
           * Name of the event fired when API library is loaded.
           */
          successEventName: {
            type: String,
            value: 'google-api-load'
          },
  
          /**
           * Name of the event fired when there is an error loading the library.
           */
          errorEventName: {
            type: String,
            value: 'google-api-load-error'
          }
        },
  
        // Used to fix events potentially being fired multiple times by
        // iron-jsonp-library.
        _waiting: false,
  
        /**
         * Returns the loaded API.
         * @type gapi.client
         */
        get api() {
          if (window.gapi && window.gapi.client &&
              window.gapi.client[this.name]) {
            return window.gapi.client[this.name];
          } else {
            return undefined;
          }
        },
  
        /**
         * Wrapper for `gapi.auth`.
         */
        get auth() {
          return gapi.auth;
        },
  
        _loadClient: function() {
          gapi.load('client', this._doneLoadingClient.bind(this));
        },
  
        _handleLoadResponse: function(response) {
          if (response && response.error) {
            _statuses[this.name] = 'error';
            this._fireError(response);
          } else {
            _statuses[this.name] = 'loaded';
            this._fireSuccess();
          }
        },
  
        _fireSuccess: function() {
          this.fire(this.successEventName,
              { 'name': this.name, 'version': this.version });
        },
  
        _fireError: function(response) {
          if (response && response.error) {
            this.fire(this.errorEventName, {
              'name': this.name,
              'version': this.version,
              'error': response.error });
          } else {
            this.fire(this.errorEventName, {
              'name': this.name,
              'version': this.version });
          }
        },
  
        _doneLoadingClient: function() {
          _clientLoaded = true;
          // Fix for API client load event being fired multiple times by
          // iron-jsonp-library.
          if (!this._waiting) {
            this._loadApi();
          }
        },
  
        _createSelfRemovingListener: function(eventName) {
          var handler = function () {
            _loaders[this.name].removeEventListener(eventName, handler);
            this._loadApi();
          }.bind(this);
  
          return handler;
        },
  
        _loadApi: function() {
          if (_clientLoaded && this.name && this.version) {
            this._waiting = false;
            // Is this API already loaded?
            if (_statuses[this.name] == 'loaded') {
              this._fireSuccess();
            // Is a different google-api-loader already loading this API?
            } else if (_statuses[this.name] == 'loading') {
              this._waiting = true;
              _loaders[this.name].addEventListener(this.successEventName,
                  this._createSelfRemovingListener(this.successEventName));
              _loaders[this.name].addEventListener(this.errorEventName,
                  this._createSelfRemovingListener(this.errorEventName));
            // Did we get an error when we tried to load this API before?
            } else if (_statuses[this.name] == 'error') {
              this._fireError();
            // Otherwise, looks like we're loading a new API.
            } else {
              var root;
              if (this.apiRoot) {
                root = this.apiRoot;
              } else if (this.appId) {
                root = 'https://' + this.appId + '.appspot.com/_ah/api';
              }
              _statuses[this.name] = 'loading';
              _loaders[this.name] = this;
              gapi.client.load(this.name, this.version,
                  this._handleLoadResponse.bind(this), root);
            }
          }
        }
      });
    })();
  </script>