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/**
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 * SimpleTabs - Unobtrusive Tabs with Ajax
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 *
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 * @example
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 *
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 *	var tabs = new SimpleTabs($('tab-element'), {
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 * 		selector: 'h2.tab-tab'
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 *	});
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 *
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 * @version		1.0
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 *
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 * @license		MIT License
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 * @author		Harald Kirschner <mail [at] digitarald.de>
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 * @copyright	2007 Author
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 */
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var SimpleTabs = new Class({
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	Implements: [Events, Options],
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	/**
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	 * Options
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	 */
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	options: {
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		show: 0,
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		selector: '.tab-tab',
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		classWrapper: 'tab-wrapper',
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		classMenu: 'tab-menu',
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		classContainer: 'tab-container',
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		onSelect: function(toggle, container, index) {
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			toggle.addClass('tab-selected');
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			container.setStyle('display', '');
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		},
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		onDeselect: function(toggle, container, index) {
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			toggle.removeClass('tab-selected');
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			container.setStyle('display', 'none');
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		},
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		onRequest: function(toggle, container, index) {
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			container.addClass('tab-ajax-loading');
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		},
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		onComplete: function(toggle, container, index) {
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			container.removeClass('tab-ajax-loading');
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		},
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		onFailure: function(toggle, container, index) {
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			container.removeClass('tab-ajax-loading');
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		},
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		onAdded: Class.empty,
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		getContent: null,
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		ajaxOptions: {},
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		cache: true
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	},
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	/**
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	 * Constructor
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	 *
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	 * @param {Element} The parent Element that holds the tab elements
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	 * @param {Object} Options
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	 */
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	initialize: function(element, options) {
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		this.element = $(element);
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		this.setOptions(options);
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		this.selected = null;
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		this.build();
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	},
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	build: function() {
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		this.tabs = [];
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		this.menu = new Element('ul', {'class': this.options.classMenu});
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		this.wrapper = new Element('div', {'class': this.options.classWrapper});
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		this.element.getElements(this.options.selector).each(function(el) {
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			var content = el.get('href') || (this.options.getContent ? this.options.getContent.call(this, el) : el.getNext());
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			this.addTab(el.innerHTML, el.title || el.innerHTML, content);
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		}, this);
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		this.element.empty().adopt(this.menu, this.wrapper);
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		if (this.tabs.length) this.select(this.options.show);
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	},
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	/**
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	 * Add a new tab at the end of the tab menu
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	 *
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	 * @param {String} inner Text
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	 * @param {String} Title
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	 * @param {Element|String} Content Element or URL for Ajax
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	 */
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	addTab: function(text, title, content) {
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		var grab = $(content);
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		var container = (grab || new Element('div'))
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			.setStyle('display', 'none')
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			.addClass(this.options.classContainer)
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			.inject(this.wrapper);
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		var pos = this.tabs.length;
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		var evt = (this.options.hover) ? 'mouseenter' : 'click';
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		var tab = {
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			container: container,
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			toggle: new Element('li').grab(new Element('a', {
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				href: '#',
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				title: title
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			}).grab(
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				new Element('span', {html: text})
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			)).addEvent(evt, this.onClick.bindWithEvent(this, [pos])).inject(this.menu)
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		};
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		if (!grab && $type(content) == 'string') tab.url = content;
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		this.tabs.push(tab);
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		return this.fireEvent('onAdded', [tab.toggle, tab.container, pos]);
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	},
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	onClick: function(evt, index) {
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		this.select(index);
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		return false;
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	},
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	/**
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	 * Select the tab via tab-index
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	 *
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	 * @param {Number} Tab-index
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	 */
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	select: function(index) {
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		if (this.selected === index || !this.tabs[index]) return this;
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		if (this.ajax) this.ajax.cancel().removeEvents();
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		var tab = this.tabs[index];
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		var params = [tab.toggle, tab.container, index];
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		if (this.selected !== null) {
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			var current = this.tabs[this.selected];
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			if (this.ajax && this.ajax.running) this.ajax.cancel();
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			params.extend([current.toggle, current.container, this.selected]);
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			this.fireEvent('onDeselect', [current.toggle, current.container, this.selected]);
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		}
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		this.fireEvent('onSelect', params);
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		if (tab.url && (!tab.loaded || !this.options.cache)) {
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			this.ajax = this.ajax || new Request.HTML();
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			this.ajax.setOptions({
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				url: tab.url,
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				method: 'get',
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				update: tab.container,
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				onFailure: this.fireEvent.pass(['onFailure', params], this),
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				onComplete: function(resp) {
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					tab.loaded = true;
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					this.fireEvent('onComplete', params);
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				}.bind(this)
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			}).setOptions(this.options.ajaxOptions);
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			this.ajax.send();
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			this.fireEvent('onRequest', params);
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		}
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		this.selected = index;
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		return this;
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	}
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});
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