server/static/bower_components/google-apis/google-maps-api.html

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<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-jsonp-library/iron-jsonp-library.html">

<!--
Dynamically loads the Google Maps JavaScript API, firing the `api-load` event when ready.

#### Example

    <google-maps-api api-key="abc123" version="3.exp"></google-maps-api>
    <script>
      var mapsAPI = document.querySelector('google-maps-api');
      mapsAPI.addEventListener('api-load', function(e) {
        // this.api === google.maps
      });
    </script>

Any number of components can use `<google-maps-api>` elements, and the library will only be loaded once.

@summary Element wrapper around Google Maps API.
-->
<script>
  Polymer({

    is: 'google-maps-api',

    behaviors: [
      Polymer.IronJsonpLibraryBehavior
    ],

    properties: {

      /** @private */
      mapsUrl: {
        type: String,
        value: 'https://maps.googleapis.com/maps/api/js?callback=%%callback%%'
      },

      /**
       * A Maps API key. To obtain an API key, see developers.google.com/maps/documentation/javascript/tutorial#api_key.
       */
      apiKey: {
        type: String,
        value: ''
      },

      /**
       * A Maps API for Business Client ID. To obtain a Maps API for Business Client ID, see developers.google.com/maps/documentation/business/.
       * If set, a Client ID will take precedence over an API Key.
       */
      clientId: {
        type: String,
        value: ''
      },

      /**
       * Version of the Maps API to use.
       */
      version: {
        type: String,
        value: '3.exp'
      },

      /**
       * The localized language to load the Maps API with. For more information
       * see https://developers.google.com/maps/documentation/javascript/basics#Language
       *
       * Note: the Maps API defaults to the preffered language setting of the browser.
       * Use this parameter to override that behavior.
       */
      language: {
        type: String,
        value: ''
      },
      /**
       * If true, sign-in is enabled.
       * See https://developers.google.com/maps/documentation/javascript/signedin#enable_sign_in
       */
      signedIn: {
        type: Boolean,
        value: false
      },

      /**
       * Fired when the Maps API library is loaded and ready.
       * @event api-load
       */
      /**
       * Name of event fired when library is loaded and available.
       */
      notifyEvent: {
        type: String,
        value: 'api-load'
      },

      /** @private */
      libraryUrl: {
        type: String,
        computed: '_computeUrl(mapsUrl, version, apiKey, clientId, language, signedIn)'
      }
    },

    _computeUrl: function(mapsUrl, version, apiKey, clientId, language, signedIn) {
      var url = mapsUrl + '&v=' + version;

      // Always load all Maps API libraries.
      url += '&libraries=drawing,geometry,places,visualization';

      if (apiKey && !clientId) {
        url += '&key=' + apiKey;
      }

      if (clientId) {
        url += '&client=' + clientId;
      }

      // Log a warning if the user is not using an API Key or Client ID.
      if (!apiKey && !clientId) {
        var warning = 'No Google Maps API Key or Client ID specified. ' +
            'See https://developers.google.com/maps/documentation/javascript/get-api-key ' +
            'for instructions to get started with a key or client id.';
        console.warn(warning);
      }

      if (language) {
        url += '&language=' + language;
      }

      if (signedIn) {
        url += '&signed_in=' + signedIn;
      }
      return url;
    },

    /**
     * Provides the google.maps JS API namespace.
     */
    get api() {
      return google.maps;
    }
  });
</script>