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    <p>The class system has changed quite a lot in Sencha Touch 2 compared to 1.x. It is now very similar to how ExtJS 4 is. The idea behind the changes is to make it easier to understand, quicker to develop and more dynamic.</p> <p>Some changes:</p> <ul> <li>you should no longer use <code>new HTMLPanel({})</code>. Instead, use <code>Ext.create</code>, i.e. <code>Ext.create('HTMLPanel', {})</code>.</li> <li>you should no longer use <code>Ext.extend</code> to define your custom classes. Instead, use <code>Ext.define</code> with an <code>extend</code> property.</li> <li>you do not need to use <code>HTMLPanel.superclass.constrctor.apply(this, arguments)</code> anymore to call the parent. Instead, you can use <code>this.callParent(arguments)</code></li> <li><p>you should very rarely override <code>constructor</code>. This is bad practise. Instead, you should use the <code>config</code> block:</p> <pre><code>Ext.define('HTMLPanel', { extend: 'Ext.Panel', config: { html: 'This is the html of this panel.' } }); </code></pre> <p>Please note that configurations only go within the <code>config</code> block when you define a new class using <code>Ext.define</code>. If you are creating a new instance of a class using <code>Ext.create</code>, <code>new ClassName</code> or using an object with an xtype, configurations do <em>not</em> need to be within the config object.</p></li> </ul> <p>You can find out more information about the new class system by reading <a href="http://docs.sencha.com/touch/2-0/#!/guide/class_system" rel="nofollow">this guide</a>. There is also a great guide on how to migrate from 1.x to 2.x <a href="http://docs.sencha.com/touch/2-0/#!/guide/upgrade_1_to_2" rel="nofollow">here</a>.</p> <p>So, lets make your code work.</p> <p><strong>index.html</strong> (nothing needs to change):</p> <pre><code>&lt;script type="text/javascript" src="touch/sencha-touch-debug.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="HTMLPanel.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="app.js"&gt;&lt;/script&gt; </code></pre> <p><strong>app.js</strong>:</p> <pre><code>// You should use Ext.application, not Ext.setup Ext.application({ name: 'SampleLoad', requires: ['HTMLPanel'], launch: function () { var HTMLPanel = Ext.create('HTMLPanel', { // this is now `scrollable`, not `scroll` //scroll: 'vertical', scrollable: 'vertical', url: 'sample.html' }); // Add the new HTMLPanel into the viewport so it is visible Ext.Viewport.add(HTMLPanel); } }); </code></pre> <p><strong>HTMLPanel.js</strong>:</p> <pre><code>// You do not need to save a reference to HTMLPanel when you define your class //var HTMLPanel = Ext.define('HTMLPanel', { Ext.define('HTMLPanel', { extend: 'Ext.Panel', // We are using Ext.Ajax, so we should require it requires: ['Ext.Ajax'], config: { listeners: { activate: 'onActivate' }, // Create a new configuration called `url` so we can specify the URL url: null }, onActivate: function(me, container) { Ext.Ajax.request({ // we should use the getter for our new `url` config url: this.getUrl(), method: "GET", success: function(response, request) { // We should use the setter for the HTML config for this me.setHtml(response.responseText); }, failure: function(response, request) { me.setHtml("failed -- response: " + response.responseText); } }); } }); </code></pre> <p>Hopefully this helps.</p>
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