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third_party/polymer/v0_8/components/iron-ajax/iron-ajax.html

Index: third_party/polymer/v0_8/components/iron-ajax/iron-ajax.html
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+<!--
+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">
+<link rel="import" href="iron-request.html">
+
+<!--
+The `iron-ajax` element exposes network request functionality.
+
+    <iron-ajax
+        auto
+        url="http://gdata.youtube.com/feeds/api/videos/"
+        params='{"alt":"json", "q":"chrome"}'
+        handle-as="json"
+        on-response="handleResponse"
+        debounce-duration="300"></iron-ajax>
+
+With `auto` set to `true`, the element performs a request whenever
+its `url`, `params` or `body` properties are changed. Automatically generated
+requests will be debounced in the case that multiple attributes are changed
+sequentially.
+
+Note: The `params` attribute must be double quoted JSON.
+
+You can trigger a request explicitly by calling `generateRequest` on the
+element.
+-->
+
+<script>
+
+  Polymer({
+
+    is: 'iron-ajax',
+
+    /**
+     * Fired when a request is sent.
+     *
+     * @event request
+     */
+
+    /**
+     * Fired when a response is received.
+     *
+     * @event response
+     */
+
+    /**
+     * Fired when an error is received.
+     *
+     * @event error
+     */
+
+    properties: {
+      /**
+       * The URL target of the request.
+       */
+      url: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * An object that contains query parameters to be appended to the
+       * specified `url` when generating a request.
+       */
+      params: {
+        type: Object,
+        value: function() {
+          return {};
+        }
+      },
+
+      /**
+       * The HTTP method to use such as 'GET', 'POST', 'PUT', or 'DELETE'.
+       * Default is 'GET'.
+       */
+      method: {
+        type: String,
+        value: 'GET'
+      },
+
+      /**
+       * HTTP request headers to send.
+       *
+       * Example:
+       *
+       *     <iron-ajax
+       *         auto
+       *         url="http://somesite.com"
+       *         headers='{"X-Requested-With": "XMLHttpRequest"}'
+       *         handle-as="json"
+       *         last-response-changed="{{handleResponse}}"></iron-ajax>
+       */
+      headers: {
+        type: Object,
+        value: function() {
+          return {};
+        }
+      },
+
+      /**
+       * Content type to use when sending data. If the contenttype is set
+       * and a `Content-Type` header is specified in the `headers` attribute,
+       * the `headers` attribute value will take precedence.
+       */
+      contentType: {
+        type: String,
+        value: 'application/x-www-form-urlencoded'
+      },
+
+      /**
+       * Optional raw body content to send when method === "POST".
+       *
+       * Example:
+       *
+       *     <iron-ajax method="POST" auto url="http://somesite.com"
+       *         body='{"foo":1, "bar":2}'>
+       *     </iron-ajax>
+       */
+      body: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * Toggle whether XHR is synchronous or asynchronous. Don't change this
+       * to true unless You Know What You Are Doing™.
+       */
+      sync: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * Specifies what data to store in the `response` property, and
+       * to deliver as `event.response` in `response` events.
+       *
+       * One of:
+       *
+       *    `text`: uses `XHR.responseText`.
+       *
+       *    `xml`: uses `XHR.responseXML`.
+       *
+       *    `json`: uses `XHR.responseText` parsed as JSON.
+       *
+       *    `arraybuffer`: uses `XHR.response`.
+       *
+       *    `blob`: uses `XHR.response`.
+       *
+       *    `document`: uses `XHR.response`.
+       */
+      handleAs: {
+        type: String,
+        value: 'json'
+      },
+
+      /**
+       * Set the withCredentials flag on the request.
+       */
+      withCredentials: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * If true, automatically performs an Ajax request when either `url` or
+       * `params` changes.
+       */
+      auto: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * If true, error messages will automatically be logged to the console.
+       */
+      verbose: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * Will be set to true if there is at least one in-flight request
+       * associated with this iron-ajax element.
+       */
+      loading: {
+        type: Boolean,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * Will be set to the most recent request made by this iron-ajax element.
+       */
+      lastRequest: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * Will be set to the most recent response received by a request
+       * that originated from this iron-ajax element. The type of the response
+       * is determined by the value of `handleas` at the time that the request
+       * was generated.
+       */
+      lastResponse: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * Will be set to the most recent error that resulted from a request
+       * that originated from this iron-ajax element.
+       */
+      lastError: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * An Array of all in-flight requests originating from this iron-ajax
+       * element.
+       */
+      activeRequests: {
+        type: Array,
+        notify: true,
+        readOnly: true,
+        value: function() {
+          this._setActiveRequests([]);
+        }
+      },
+
+      /**
+       * Length of time in milliseconds to debounce multiple requests.
+       */
+      debounceDuration: {
+        type: Number,
+        value: 0,
+        notify: true
+      },
+
+      _boundHandleResponse: {
+        type: Function,
+        value: function() {
+          return this.handleResponse.bind(this);
+        }
+      },
+
+      _boundDiscardRequest: {
+        type: Function,
+        value: function() {
+          return this.discardRequest.bind(this);
+        }
+      }
+    },
+
+    observers: [
+      'requestOptionsChanged(url, method, params, headers,' +
+        'contentType, body, sync, handleAs, withCredentials, auto)'
+    ],
+
+    get queryString () {
+      var queryParts = [];
+      var param;
+      var value;
+
+      for (param in this.params) {
+        value = this.params[param];
+        param = window.encodeURIComponent(param);
+
+        if (value !== null) {
+          param += '=' + window.encodeURIComponent(value);
+        }
+
+        queryParts.push(param);
+      }
+
+      return queryParts.join('&');
+    },
+
+    get requestUrl() {
+      var queryString = this.queryString;
+
+      if (queryString) {
+        return this.url + '?' + queryString;
+      }
+
+      return this.url;
+    },
+
+    get requestHeaders() {
+      var headers = {
+        'content-type': this.contentType
+      };
+      var header;
+
+      if (this.headers instanceof Object) {
+        for (header in this.headers) {
+          headers[header] = this.headers[header].toString();
+        }
+      }
+
+      return headers;
+    },
+
+    toRequestOptions: function() {
+      return {
+        url: this.requestUrl,
+        method: this.method,
+        headers: this.requestHeaders,
+        body: this.body,
+        async: !this.sync,
+        handleAs: this.handleAs,
+        withCredentials: this.withCredentials
+      };
+    },
+
+    requestOptionsChanged: function() {
+      this.debounce('generate-request', function() {
+        if (!this.url && this.url !== '') {
+          return;
+        }
+
+        if (this.auto) {
+          this.generateRequest();
+        }
+      }, this.debounceDuration);
+    },
+
+    /**
+     * Performs an AJAX request to the specified URL.
+     *
+     * @method generateRequest
+     */
+    generateRequest: function() {
+      var request = document.createElement('iron-request');
+      var requestOptions = this.toRequestOptions();
+
+      this.activeRequests.push(request);
+
+      request.completes.then(
+        this._boundHandleResponse
+      ).catch(
+        this.handleError.bind(this, request)
+      ).then(
+        this._boundDiscardRequest
+      );
+
+      request.send(requestOptions);
+
+      this._setLastRequest(request);
+
+      this.fire('request', {
+        request: request,
+        options: requestOptions
+      });
+
+      return request;
+    },
+
+    handleResponse: function(request) {
+      this._setLastResponse(request.response);
+      this.fire('response', request);
+    },
+
+    handleError: function(request, error) {
+      if (this.verbose) {
+        console.error(error);
+      }
+
+      this._setLastError({
+        request: request,
+        error: error
+      });
+      this.fire('error', {
+        request: request,
+        error: error
+      });
+    },
+
+    discardRequest: function(request) {
+      var requestIndex = this.activeRequests.indexOf(request);
+
+      if (requestIndex > 0) {
+        this.activeRequests.splice(requestIndex, 1);
+      }
+    }
+  });
+</script>