update based on pull request comments:

- separate g-xhr to a component (component-as-module-pattern)
- dispatch Events instead
- add jsdoc to public methods
- update comment
- use classList.enable
- use handlers="click: clickHandler" instead of experimental event
binding

src/g-ajax.html

@@ -7,76 +7,25 @@
 -->
 <element name="g-ajax" attributes="url, handleAs, params">
   <link rel="components" href="g-component.html">
+  <link rel="components" href="g-xhr.html">
   <template>
+    <g-xhr id="xhr"></g-xhr>
     <content></content>
   </template>
   <script>
-    var xhr = {
-      request: function(inOptions) {
-        var transport = this.getTransport();
-        var url = inOptions.url;
-        var method = inOptions.method || 'GET';
-        var async = !inOptions.sync;
-        var params = this.toQueryString(inOptions.params);
-        if (params && method == 'GET') {
-          url += (url.indexOf('?') > 0 ? '&' : '?') + params;
-        }
-        transport.open(method, url, async);
-        this.makeReadyStateHandler(transport, inOptions.callback);
-        this.setRequestHeaders(inOptions.headers);
-        transport.send(method == 'POST' ? (inOptions.body || params) : null);
-        if (!async) {
-          transport.onreadystatechange(transport);
-        }
-        return transport;
-      },
-      getTransport: function() {
-        try {
-          return new XMLHttpRequest();
-        } catch (e) {}
-        try {
-          return new ActiveXObject('Msxml2.XMLHTTP');
-        } catch (e) {}
-        try {
-          return new ActiveXObject('Microsoft.XMLHTTP');
-        } catch (e) {}
-        return false;
-      },
-      makeReadyStateHandler: function(inXhr, inCallback) {
-        inXhr.onreadystatechange = function() {
-          if (inXhr.readyState == 4) {
-            inCallback && inCallback.apply(null, [inXhr.responseText, inXhr]);
-          }
-        };
-      },
-      setRequestHeaders: function(inXhr, inHeaders) {
-        if (inHeaders) {
-          for (var name in inHeaders) {
-            xhr.setRequestHeader(name, inHeaders[name]);
-          }
-        }
-      },
-      toQueryString: function(inParams) {
-        var r = [];
-        for (var n in inParams) {
-          var v = inParams[n];
-          n = encodeURIComponent(n);
-          r.push(v === undefined || v === null ? n : (n + '=' + encodeURIComponent(v)));
-        }
-        return r.join('&');
-      }
-    };
     this.component({
       created: function(inSuper) {
-        this.context = this.context || window;
         if (this.getAttribute('autogo')) {
           this.go();
         }
       },
       prototype: {
+        /**
+         * Performs an Ajax request to the url specified.
+         */
         go: function() {
           var params = JSON.parse(this.params);
-          return xhr.request({url: this.url, callback: this.receive.bind(this), params: params});
+          return this.$.xhr.request({url: this.url, callback: this.receive.bind(this), params: params});
         },
         receive: function(inResponse, inXhr) {
           if (this.isSuccess(inXhr)) {
@@ -90,21 +39,23 @@
           var status = inXhr.status || 0;
           return !status || (status >= 200 && status < 300);
         },
-        fire: function(inMethod, inArgs) {
-          var fn = this.context[this.getAttribute(inMethod)];
-          fn && fn.apply(this.context, inArgs);
+        dispatchAjaxEvent: function(inType, inResponse, inXhr) {
+          this.dispatchEvent(new CustomEvent(inType,
+            {detail: {response: inResponse, xhr: inXhr}}));
         },
         response: function(inXhr) {
           var response = this.evalResponse(inXhr);
-          this.fire('onresponse', [response, inXhr]);
+          this.dispatchAjaxEvent('response', response, inXhr);
+          // Here we want to expose the response as a model so that it can be
+          // consumed by other components.
           this.model = this.model || {};
           this.model.response = response;
         },
         error: function(inXhr) {
-          this.fire('onerror', [inXhr.status + ': ' + inXhr.responseText, inXhr]);
+          this.dispatchAjaxEvent('error', inXhr.status + ': ' + inXhr.responseText, inXhr);
         },
         complete: function(inXhr) {
-          this.fire('oncomplete', [inXhr]);
+          this.dispatchAjaxEvent('complete', inXhr.status, inXhr);
         },
         evalResponse: function(inXhr) {
           return this[(this.handleAs || 'text') + 'Handler'](inXhr);

src/g-togglebutton.html

@@ -5,11 +5,11 @@
  * license that can be found in the LICENSE file.
  */
 -->
-<element name="g-togglebutton" attributes="value">
+<element name="g-togglebutton" attributes="value" handlers="click: clickHandler">
   <link rel="components" href="g-component.html">
   <link rel="stylesheet" href="css/g-togglebutton.css" />
   <template>
-    <div id="toggle" class="toggle" onclick="x('clickHandler')">
+    <div id="toggle" class="toggle">
       <span class="on">ON</span>
       <span class="off">OFF</span>
       <span class="thumb"></span>
@@ -22,12 +22,12 @@
       },
       prototype: {
         valueAttributeChanged: function() {
-          this.$.toggle.classList[this.trueValue() ? 'add' : 'remove']('on');
+          this.$.toggle.classList.enable('on', this.trueValue());
         },
         clickHandler: function() {
           this.value = !this.trueValue();
         },
-        // note: should base component auto-convert string value to boolean?
+        // TODO(ffu): remove this when base component handles auto-converting string value to boolean
         trueValue: function() {
           return this.value != 'false' && Boolean(this.value);
         }

src/g-xhr.html

@@ -0,0 +1,90 @@
+<!--
+/*
+ * Copyright 2012 The Toolkitchen Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+-->
+<element name="g-xhr">
+  <link rel="components" href="g-component.html">
+  <template>
+    <style>
+      @host {
+        display: none;
+      }
+    </style>
+  </template>
+  <script>
+    this.component({
+      prototype: {
+        /**
+         * Sends a HTTP request to the server and returns the XHR object.
+         *
+         * @param inOptions A set of key/value pairs that configure the request.
+         * @param inOptions.url The url to which the request is sent.
+         * @param inOptions.method The HTTP method to use, default is GET.
+         * @param inOptions.sync By default, all requests are sent asynchronously.
+         *        To send synchronous requests, set to true.
+         * @param inOptions.params Data to be sent to the server.
+         * @param inOptions.body The content for the request body for POST method.
+         * @param inOptions.headers HTTP request headers.
+         * @param inOptions.callback Called when request is completed.
+         * @returns XHR object.
+         */
+        request: function(inOptions) {
+          var transport = this.getTransport();
+          var url = inOptions.url;
+          var method = inOptions.method || 'GET';
+          var async = !inOptions.sync;
+          var params = this.toQueryString(inOptions.params);
+          if (params && method == 'GET') {
+            url += (url.indexOf('?') > 0 ? '&' : '?') + params;
+          }
+          transport.open(method, url, async);
+          this.makeReadyStateHandler(transport, inOptions.callback);
+          this.setRequestHeaders(inOptions.headers);
+          transport.send(method == 'POST' ? (inOptions.body || params) : null);
+          if (!async) {
+            transport.onreadystatechange(transport);
+          }
+          return transport;
+        },
+        getTransport: function() {
+          try {
+            return new XMLHttpRequest();
+          } catch (e) {}
+          try {
+            return new ActiveXObject('Msxml2.XMLHTTP');
+          } catch (e) {}
+          try {
+            return new ActiveXObject('Microsoft.XMLHTTP');
+          } catch (e) {}
+          return false;
+        },
+        makeReadyStateHandler: function(inXhr, inCallback) {
+          inXhr.onreadystatechange = function() {
+            if (inXhr.readyState == 4) {
+              inCallback && inCallback.apply(null, [inXhr.responseText, inXhr]);
+            }
+          };
+        },
+        setRequestHeaders: function(inXhr, inHeaders) {
+          if (inHeaders) {
+            for (var name in inHeaders) {
+              xhr.setRequestHeader(name, inHeaders[name]);
+            }
+          }
+        },
+        toQueryString: function(inParams) {
+          var r = [];
+          for (var n in inParams) {
+            var v = inParams[n];
+            n = encodeURIComponent(n);
+            r.push(v === undefined || v === null ? n : (n + '=' + encodeURIComponent(v)));
+          }
+          return r.join('&');
+        }
+      }
+    });
+  </script>
+</element>