Request.RSS.js

/*
---
license: MIT-style
authors: [Christopher Pitt]
...
*/
(function(){

	var template =
		'<div class="item">'+
			'<div class="title">{title}</div>'+
			'<div class="link">{link}</div>'+
			'<div class="date">{date}</div>'+
			'<div class="description">{description}</div>'+
		'</div>';

	Request.RSS = new Class({
		'Extends': Request,
		'initialize': function (container, options) {
			this.parent(options);
			this.container = document.id(container);
		},
		'success': function (text, xml) {
			var root = xml.getElementsByTagName('channel')[0],
				items = root.getElementsByTagName('item');

			if (this.container != null) {
				this.container.empty();
				Array.each(items, function (item) {
					var elements = {
						'title': item.getElementsByTagName('title')[0],
						'link': item.getElementsByTagName('link')[0],
						'pubDate': item.getElementsByTagName('pubDate')[0],
						'description': item.getElementsByTagName('description')[0]
					};

					var temp = new Element('div', {
						'html': elements.description != null ? elements.description.get('text') : ''
					});

					this.container.innerHTML += (template || this.options.template).substitute({
						'title': elements.title != null ? elements.title.get('text') : '',
						'link': elements.link != null ? elements.link.get('text') : '',
						'pubDate': elements.pubDate != null ? elements.pubDate.get('text') : '',
						'description': temp.get('text')
					});

					temp.destroy();
					Array.each(elements, function (element, key) {
						delete elements[key];
					});
				}.bind(this));
			}

			this.onSuccess(items, xml);
		}
	});

}());