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third_party/polymer/v0_8/components/iron-jsonp-library/iron-jsonp-library.html

Index: third_party/polymer/v0_8/components/iron-jsonp-library/iron-jsonp-library.html
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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://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 http://polymer.github.io/PATENTS.txt
+-->
+<link rel="import" href="../polymer/polymer.html">
+
+<script>
+(function() {
+  "use strict";
+  /**
+    `Polymer.IronJsonpLibraryBehavior` loads a jsonp library.
+    Multiple components can request same library, only one copy will load.
+
+    Some libraries require a specific global function be defined.
+    If this is the case, specify the `callbackName` property.
+
+    You should use an HTML Import to load library dependencies
+    when possible instead of using this element.
+
+    @hero hero.svg
+    @polymerBehavior
+   */
+  Polymer.IronJsonpLibraryBehavior = {
+
+    properties: {
+      /**
+       * True if library has been successfully loaded
+       */
+      libraryLoaded: {
+        type: Boolean,
+        value: false,
+        notify: true,
+        readOnly: true
+      },
+      /**
+       * Not null if library has failed to load
+       */
+      libraryErrorMessage: {
+        type: String,
+        value: null,
+        notify: true,
+        readOnly: true
+      }
+      // Following properties are to be set by behavior users
+      /**
+       * Library url. Must contain string `%%callback_name%%`.
+       *
+       * `%%callback_name%%` is a placeholder for jsonp wrapper function name
+       *
+       * Ex: https://maps.googleapis.com/maps/api/js?callback=%%callback%%
+       * @property libraryUrl
+       */
+      /**
+       * Set if library requires specific callback name.
+       * Name will be automatically generated if not set.
+       * @property callbackName
+       */
+      /**
+       * name of event to be emitted when library loads. Standard is `api-load`
+       * @property notifyEvent
+       */
+      /**
+       * event with name specified in `notifyEvent` attribute
+       * will fire upon successful load2
+       * @event `notifyEvent`
+       */
+    },
+
+    _libraryLoadCallback: function(err, result) {
+      if (err) {
+        console.warn("Library load failed:", err.message);
+        this._setLibraryErrorMessage(err.message);
+      }
+      else {
+        this._setLibraryErrorMessage(null);
+        this._setLibraryLoaded(true);
+        if (this.notifyEvent)
+          this.fire( this.notifyEvent, result);
+      }
+    },
+
+    /** loads the library, and fires this.notifyEvent upon completion */
+    _loadLibrary: function() {
+      LoaderMap.require(
+        this.libraryUrl,
+        this._libraryLoadCallback.bind(this),
+        this.callbackName
+      );
+    },
+
+    ready: function() {
+      this._loadLibrary();
+    }
+  };
+
+  /*
+   * LoaderMap keeps track of all Loaders
+   */
+  var LoaderMap = {
+    apiMap: {}, // { hash -> Loader }
+
+    /*
+     * @param {function} notifyCallback loaded callback fn(result)
+     * @param {string} jsonpCallbackName name of jsonpcallback. If API does not provide it, leave empty. Optional.
+     */
+    require: function(url, notifyCallback, jsonpCallbackName) {
+
+      // make hashable string form url
+      var name = this.nameFromUrl(url);
+
+      // create a loader as needed
+      if (!this.apiMap[name])
+        this.apiMap[name] = new Loader(name, url, jsonpCallbackName);
+
+      // ask for notification
+      this.apiMap[name].requestNotify(notifyCallback);
+    },
+
+    nameFromUrl: function(url) {
+      return url.replace(/[\:\/\%\?\&\.\=\-\,]/g, '_') + '_api';
+    }
+  };
+
+  var Loader = function(name, url, callbackName) {
+    this.notifiers = [];  // array of notifyFn [ notifyFn* ]
+
+    // callback is specified either as callback name
+    // or computed dynamically if url has callbackMacro in it
+    if (!callbackName) {
+      if (url.indexOf(this.callbackMacro) >= 0) {
+        callbackName = name + '_loaded';
+        url = url.replace(this.callbackMacro, callbackName);
+      } else {
+        this.error = new Error('IronJsonpLibraryBehavior a %%callback_name%% parameter is required in libraryUrl');
+        // TODO(sjmiles): we should probably fallback to listening to script.load
+        return;
+      }
+    }
+    this.callbackName = callbackName;
+    window[this.callbackName] = this.success.bind(this);
+    this.addScript(url);
+  };
+
+  Loader.prototype = {
+
+    callbackMacro: '%%callback%%',
+    loaded: false,
+
+    addScript: function(src) {
+      var script = document.createElement('script');
+      script.src = src;
+      script.onerror = this.handleError.bind(this);
+      var s = document.querySelector('script') || document.body;
+      s.parentNode.insertBefore(script, s);
+      this.script = script;
+    },
+
+    removeScript: function() {
+      if (this.script.parentNode) {
+        this.script.parentNode.removeChild(this.script);
+      }
+      this.script = null;
+    },
+
+    handleError: function(ev) {
+      this.error = new Error("Library failed to load");
+      this.notifyAll();
+      this.cleanup();
+    },
+
+    success: function() {
+      this.loaded = true;
+      this.result = Array.prototype.slice.call(arguments);
+      this.notifyAll();
+      this.cleanup();
+    },
+
+    cleanup: function() {
+      delete window[this.callbackName];
+    },
+
+    notifyAll: function(notifyCallback) {
+      this.notifiers.forEach( function(notifyCallback) {
+        notifyCallback(this.error, this.result);
+      }.bind(this));
+      this.notifiers = [];
+    },
+
+    requestNotify: function(notifyCallback) {
+      if (this.loaded || this.error) {
+        notifyCallback( this.error, this.result);
+      } else {
+        this.notifiers.push(notifyCallback);
+      }
+    }
+  };
+})();
+</script>
+
+<!--
+  Loads specified jsonp library.
+
+  Example:
+
+    <iron-jsonp-library
+      library-url="https://apis.google.com/js/plusone.js?onload=%%callback%%"
+      notify-event="api-load"
+      library-loaded="{{loaded}}"></iron-jsonp-library>
+
+  Will emit 'api-load' event when loaded, and set 'loaded' to true
+
+  Implemented by  Polymer.IronJsonpLibraryBehavior. Use it
+  to create specific library loader elements.
+
+  @demo
+-->
+<script>
+  Polymer({
+
+    is: 'iron-jsonp-library',
+
+    behaviors: [ Polymer.IronJsonpLibraryBehavior ],
+
+    properties: {
+      /**
+       * Library url. Must contain string `%%callback_name%%`.
+       *
+       * `%%callback_name%%` is a placeholder for jsonp wrapper function name
+       *
+       * Ex: https://maps.googleapis.com/maps/api/js?callback=%%callback%%
+       */
+      libraryUrl: String,
+      /**
+       * Set if library requires specific callback name.
+       * Name will be automatically generated if not set.
+       */
+      callbackName: String,
+      /**
+       * event with name specified in 'notifyEvent' attribute
+       * will fire upon successful load
+       */
+      notifyEvent: String
+      /**
+       * event with name specified in 'notifyEvent' attribute
+       * will fire upon successful load
+       * @event `notifyEvent`
+       */
+
+    }
+  });
+
+</script>