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POMootools class - storing reference to document body in a class property
 

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    <p>Greetings all! I'm trying to learn Mootools classes. I've made this class to add a div to the page.</p> <pre><code>var F = new Class({ Implements: [Options, Events], options: { container: document.body, width: '250px', background: '#ccc' }, initialize: function(options) { this.setOptions(options); this.addDemoDiv(); }, addDemoDiv: function() { var dDiv = new Element('div', { 'class': 'myClass', html: 'Click me!', styles: { padding: '20px', border: '1px solid #999', width: this.options.width, background: this.options.background }, events: { click: this.animate } }); dDiv.inject(this.options.container); }, animate: function() { alert('Hello world'); } }); window.addEvent('domready', function() { var item = new F(); }); </code></pre> <p>It's supposed to allow the user to specify the container to inject the div into, with the document body being the default. When I do it like above, the code validates OK, but the script fails to add the div - Firebug and Chrome complain about the container being null or undefined.</p> <p>I have to change <code>dDiv.inject(this.options.container);</code> to this</p> <pre><code>if (!this.container) { dDiv.inject(document.body); } else { dDiv.inject(this.container); } </code></pre> <p>to make it work.</p> <p>Can any wise Mootools ninja tell me why inject works when I pass document.body in directly, but breaks when I try to pass it a reference to document.body supposedly stored in the class's container option? I've tried variations on document.body, like 'document.body' and $$('document.body') and $$(document.body).</p>
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