ui.tabs.js

使用JSP和Java Bean来构建一个网上书店。本章介绍的例子可以分成两大部分

/*
 * jQuery UI Tabs
 *
 * Copyright (c) 2007, 2008 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Tabs
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

$.widget("ui.tabs", {
	init: function() {
		this.options.event += '.tabs'; // namespace event
		
		// create tabs
		this.tabify(true);
	},
	setData: function(key, value) {
		if ((/^selected/).test(key))
			this.select(value);
		else {
			this.options[key] = value;
			this.tabify();
		}
	},
	length: function() {
		return this.$tabs.length;
	},
	tabId: function(a) {
		return a.title && a.title.replace(/\s/g, '_').replace(/[^A-Za-z0-9\-_:\.]/g, '')
			|| this.options.idPrefix + $.data(a);
	},
	ui: function(tab, panel) {
		return {
			options: this.options,
			tab: tab,
			panel: panel
		};
	},
	tabify: function(init) {

		this.$lis = $('li:has(a[href])', this.element);
		this.$tabs = this.$lis.map(function() { return $('a', this)[0]; });
		this.$panels = $([]);

		var self = this, o = this.options;

		this.$tabs.each(function(i, a) {
			// inline tab
			if (a.hash && a.hash.replace('#', '')) // Safari 2 reports '#' for an empty hash
				self.$panels = self.$panels.add(a.hash);
			// remote tab
			else if ($(a).attr('href') != '#') { // prevent loading the page itself if href is just "#"
				$.data(a, 'href.tabs', a.href); // required for restore on destroy
				$.data(a, 'load.tabs', a.href); // mutable
				var id = self.tabId(a);
				a.href = '#' + id;
				var $panel = $('#' + id);
				if (!$panel.length) {
					$panel = $(o.panelTemplate).attr('id', id).addClass(o.panelClass)
						.insertAfter( self.$panels[i - 1] || self.element );
					$panel.data('destroy.tabs', true);
				}
				self.$panels = self.$panels.add( $panel );
			}
			// invalid tab href
			else
				o.disabled.push(i + 1);
		});

		if (init) {

			// attach necessary classes for styling if not present
			this.element.addClass(o.navClass);
			this.$panels.each(function() {
				var $this = $(this);
				$this.addClass(o.panelClass);
			});

			// Selected tab
			// use "selected" option or try to retrieve:
			// 1. from fragment identifier in url
			// 2. from cookie
			// 3. from selected class attribute on <li>
			if (o.selected === undefined) {
				if (location.hash) {
					this.$tabs.each(function(i, a) {
						if (a.hash == location.hash) {
							o.selected = i;
							// prevent page scroll to fragment
							if ($.browser.msie || $.browser.opera) { // && !o.remote
								var $toShow = $(location.hash), toShowId = $toShow.attr('id');
								$toShow.attr('id', '');
								setTimeout(function() {
									$toShow.attr('id', toShowId); // restore id
								}, 500);
							}
							scrollTo(0, 0);
							return false; // break
						}
					});
				}
				else if (o.cookie) {
					var index = parseInt($.cookie('ui-tabs' + $.data(self.element)),10);
					if (index && self.$tabs[index])
						o.selected = index;
				}
				else if (self.$lis.filter('.' + o.selectedClass).length)
					o.selected = self.$lis.index( self.$lis.filter('.' + o.selectedClass)[0] );
			}
			o.selected = o.selected === null || o.selected !== undefined ? o.selected : 0; // first tab selected by default

			// Take disabling tabs via class attribute from HTML
			// into account and update option properly.
			// A selected tab cannot become disabled.
			o.disabled = $.unique(o.disabled.concat(
				$.map(this.$lis.filter('.' + o.disabledClass),
					function(n, i) { return self.$lis.index(n); } )
			)).sort();
			if ($.inArray(o.selected, o.disabled) != -1)
				o.disabled.splice($.inArray(o.selected, o.disabled), 1);
			
			// highlight selected tab
			this.$panels.addClass(o.hideClass);
			this.$lis.removeClass(o.selectedClass);
			if (o.selected !== null) {
				this.$panels.eq(o.selected).show().removeClass(o.hideClass); // use show and remove class to show in any case no matter how it has been hidden before
				this.$lis.eq(o.selected).addClass(o.selectedClass);
				
				// seems to be expected behavior that the show callback is fired
				var onShow = function() {
					$(self.element).triggerHandler('tabsshow',
						[null, self.ui(self.$tabs[o.selected], self.$panels[o.selected])], o.show);
				}; 

				// load if remote tab
				if ($.data(this.$tabs[o.selected], 'load.tabs'))
					this.load(o.selected, onShow);
				// just trigger show event
				else
					onShow();
				
			}
			
			// clean up to avoid memory leaks in certain versions of IE 6
			$(window).bind('unload', function() {
				self.$tabs.unbind('.tabs');
				self.$lis = self.$tabs = self.$panels = null;
			});

		}

		// disable tabs
		for (var i = 0, li; li = this.$lis[i]; i++)
			$(li)[$.inArray(i, o.disabled) != -1 && !$(li).hasClass(o.selectedClass) ? 'addClass' : 'removeClass'](o.disabledClass);

		// reset cache if switching from cached to not cached
		if (o.cache === false)
			this.$tabs.removeData('cache.tabs');
		
		// set up animations
		var hideFx, showFx, baseFx = { 'min-width': 0, duration: 1 }, baseDuration = 'normal';
		if (o.fx && o.fx.constructor == Array)
			hideFx = o.fx[0] || baseFx, showFx = o.fx[1] || baseFx;
		else
			hideFx = showFx = o.fx || baseFx;

		// reset some styles to maintain print style sheets etc.
		var resetCSS = { display: '', overflow: '', height: '' };
		if (!$.browser.msie) // not in IE to prevent ClearType font issue
			resetCSS.opacity = '';

		// Hide a tab, animation prevents browser scrolling to fragment,
		// $show is optional.
		function hideTab(clicked, $hide, $show) {
			$hide.animate(hideFx, hideFx.duration || baseDuration, function() { //
				$hide.addClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
				if ($.browser.msie && hideFx.opacity)
					$hide[0].style.filter = '';
				if ($show)
					showTab(clicked, $show, $hide);
			});
		}

		// Show a tab, animation prevents browser scrolling to fragment,
		// $hide is optional.
		function showTab(clicked, $show, $hide) {
			if (showFx === baseFx)
				$show.css('display', 'block'); // prevent occasionally occuring flicker in Firefox cause by gap between showing and hiding the tab panels
			$show.animate(showFx, showFx.duration || baseDuration, function() {
				$show.removeClass(o.hideClass).css(resetCSS); // maintain flexible height and accessibility in print etc.
				if ($.browser.msie && showFx.opacity)
					$show[0].style.filter = '';

				// callback
				$(self.element).triggerHandler('tabsshow',
					[null, self.ui(clicked, $show[0])], o.show);

			});
		}

		// switch a tab
		function switchTab(clicked, $li, $hide, $show) {
			/*if (o.bookmarkable && trueClick) { // add to history only if true click occured, not a triggered click
				$.ajaxHistory.update(clicked.hash);
			}*/
			$li.addClass(o.selectedClass)
				.siblings().removeClass(o.selectedClass);
			hideTab(clicked, $hide, $show);
		}

		// attach tab event handler, unbind to avoid duplicates from former tabifying...
		this.$tabs.unbind('.tabs').bind(o.event, function() {

			//var trueClick = e.clientX; // add to history only if true click occured, not a triggered click
			var $li = $(this).parents('li:eq(0)'),
				$hide = self.$panels.filter(':visible'),
				$show = $(this.hash);

			// If tab is already selected and not unselectable or tab disabled or 
			// or is already loading or click callback returns false stop here.
			// Check if click handler returns false last so that it is not executed
			// for a disabled or loading tab!
			if (($li.hasClass(o.selectedClass) && !o.unselect)
				|| $li.hasClass(o.disabledClass) 
				|| $(this).hasClass(o.loadingClass)
				|| $(self.element).triggerHandler('tabsselect', [null, self.ui(this, $show[0])], o.select) === false
				) {
				this.blur();
				return false;
			}

			self.options.selected = self.$tabs.index(this);

			// if tab may be closed
			if (o.unselect) {
				if ($li.hasClass(o.selectedClass)) {
					self.options.selected = null;
					$li.removeClass(o.selectedClass);
					self.$panels.stop();
					hideTab(this, $hide);
					this.blur();
					return false;
				} else if (!$hide.length) {
					self.$panels.stop();
					var a = this;
					self.load(self.$tabs.index(this), function() {
						$li.addClass(o.selectedClass).addClass(o.unselectClass);
						showTab(a, $show);
					});
					this.blur();
					return false;
				}
			}

			if (o.cookie)
				$.cookie('ui-tabs' + $.data(self.element), self.options.selected, o.cookie);

			// stop possibly running animations
			self.$panels.stop();

			// show new tab
			if ($show.length) {

				// prevent scrollbar scrolling to 0 and than back in IE7, happens only if bookmarking/history is enabled
				/*if ($.browser.msie && o.bookmarkable) {
					var showId = this.hash.replace('#', '');
					$show.attr('id', '');
					setTimeout(function() {
						$show.attr('id', showId); // restore id
					}, 0);
				}*/

				var a = this;
				self.load(self.$tabs.index(this), $hide.length ? 
					function() {
						switchTab(a, $li, $hide, $show);
					} :
					function() {
						$li.addClass(o.selectedClass);
						showTab(a, $show);
					}
				);

				// Set scrollbar to saved position - need to use timeout with 0 to prevent browser scroll to target of hash
				/*var scrollX = window.pageXOffset || document.documentElement && document.documentElement.scrollLeft || document.body.scrollLeft || 0;
				var scrollY = window.pageYOffset || document.documentElement && document.documentElement.scrollTop || document.body.scrollTop || 0;
				setTimeout(function() {
					scrollTo(scrollX, scrollY);
				}, 0);*/

			} else
				throw 'jQuery UI Tabs: Mismatching fragment identifier.';