JavaScript - Accordion Menus - Newer Code In This Link Or No?

/*
 * jQuery UI Accordion 1.8.16
 *
 * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 */
(function( $, undefined ) {

$.widget( "ui.accordion", {
	options: {
		active: 0,
		animated: "slide",
		autoHeight: true,
		clearStyle: false,
		collapsible: false,
		event: "click",
		fillSpace: false,
		header: "> li > :first-child,> :not(li):even",
		icons: {
			header: "ui-icon-triangle-1-e",
			headerSelected: "ui-icon-triangle-1-s"
		},
		navigation: false,
		navigationFilter: function() {
			return this.href.toLowerCase() === location.href.toLowerCase();
		}
	},

	_create: function() {
		var self = this,
			options = self.options;

		self.running = 0;

		self.element
			.addClass( "ui-accordion ui-widget ui-helper-reset" )
			// in lack of child-selectors in CSS
			// we need to mark top-LIs in a UL-accordion for some IE-fix
			.children( "li" )
				.addClass( "ui-accordion-li-fix" );

		self.headers = self.element.find( options.header )
			.addClass( "ui-accordion-header ui-helper-reset ui-state-default ui-corner-all" )
			.bind( "mouseenter.accordion", function() {
				if ( options.disabled ) {
					return;
				}
				$( this ).addClass( "ui-state-hover" );
			})
			.bind( "mouseleave.accordion", function() {
				if ( options.disabled ) {
					return;
				}
				$( this ).removeClass( "ui-state-hover" );
			})
			.bind( "focus.accordion", function() {
				if ( options.disabled ) {
					return;
				}
				$( this ).addClass( "ui-state-focus" );
			})
			.bind( "blur.accordion", function() {
				if ( options.disabled ) {
					return;
				}
				$( this ).removeClass( "ui-state-focus" );
			});

		self.headers.next()
			.addClass( "ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom" );

		if ( options.navigation ) {
			var current = self.element.find( "a" ).filter( options.navigationFilter ).eq( 0 );
			if ( current.length ) {
				var header = current.closest( ".ui-accordion-header" );
				if ( header.length ) {
					// anchor within header
					self.active = header;
				} else {
					// anchor within content
					self.active = current.closest( ".ui-accordion-content" ).prev();
				}
			}
		}

		self.active = self._findActive( self.active || options.active )
			.addClass( "ui-state-default ui-state-active" )
			.toggleClass( "ui-corner-all" )
			.toggleClass( "ui-corner-top" );
		self.active.next().addClass( "ui-accordion-content-active" );

		self._createIcons();
		self.resize();
		
		// ARIA
		self.element.attr( "role", "tablist" );

		self.headers
			.attr( "role", "tab" )
			.bind( "keydown.accordion", function( event ) {
				return self._keydown( event );
			})
			.next()
				.attr( "role", "tabpanel" );

		self.headers
			.not( self.active || "" )
			.attr({
				"aria-expanded": "false",
				"aria-selected": "false",
				tabIndex: -1
			})
			.next()
				.hide();

		// make sure at least one header is in the tab order
		if ( !self.active.length ) {
			self.headers.eq( 0 ).attr( "tabIndex", 0 );
		} else {
			self.active
				.attr({
					"aria-expanded": "true",
					"aria-selected": "true",
					tabIndex: 0
				});
		}

		// only need links in tab order for Safari
		if ( !$.browser.safari ) {
			self.headers.find( "a" ).attr( "tabIndex", -1 );
		}

		if ( options.event ) {
			self.headers.bind( options.event.split(" ").join(".accordion ") + ".accordion", function(event) {
				self._clickHandler.call( self, event, this );
				event.preventDefault();
			});
		}
	},

	_createIcons: function() {
		var options = this.options;
		if ( options.icons ) {
			$( "<span></span>" )
				.addClass( "ui-icon " + options.icons.header )
				.prependTo( this.headers );
			this.active.children( ".ui-icon" )
				.toggleClass(options.icons.header)
				.toggleClass(options.icons.headerSelected);
			this.element.addClass( "ui-accordion-icons" );
		}
	},

	_destroyIcons: function() {
		this.headers.children( ".ui-icon" ).remove();
		this.element.removeClass( "ui-accordion-icons" );
	},

	destroy: function() {
		var options = this.options;

		this.element
			.removeClass( "ui-accordion ui-widget ui-helper-reset" )
			.removeAttr( "role" );

		this.headers
			.unbind( ".accordion" )
			.removeClass( "ui-accordion-header ui-accordion-disabled ui-helper-reset ui-state-default ui-corner-all ui-state-active ui-state-disabled ui-corner-top" )
			.removeAttr( "role" )
			.removeAttr( "aria-expanded" )
			.removeAttr( "aria-selected" )
			.removeAttr( "tabIndex" );

		this.headers.find( "a" ).removeAttr( "tabIndex" );
		this._destroyIcons();
		var contents = this.headers.next()
			.css( "display", "" )
			.removeAttr( "role" )
			.removeClass( "ui-helper-reset ui-widget-content ui-corner-bottom ui-accordion-content ui-accordion-content-active ui-accordion-disabled ui-state-disabled" );
		if ( options.autoHeight || options.fillHeight ) {
			contents.css( "height", "" );
		}

		return $.Widget.prototype.destroy.call( this );
	},

	_setOption: function( key, value ) {
		$.Widget.prototype._setOption.apply( this, arguments );
			
		if ( key == "active" ) {
			this.activate( value );
		}
		if ( key == "icons" ) {
			this._destroyIcons();
			if ( value ) {
				this._createIcons();
			}
		}
		// #5332 - opacity doesn't cascade to positioned elements in IE
		// so we need to add the disabled class to the headers and panels
		if ( key == "disabled" ) {
			this.headers.add(this.headers.next())
				[ value ? "addClass" : "removeClass" ](
					"ui-accordion-disabled ui-state-disabled" );
		}
	},

	_keydown: function( event ) {
		if ( this.options.disabled || event.altKey || event.ctrlKey ) {
			return;
		}

		var keyCode = $.ui.keyCode,
			length = this.headers.length,
			currentIndex = this.headers.index( event.target ),
			toFocus = false;

		switch ( event.keyCode ) {
			case keyCode.RIGHT:
			case keyCode.DOWN:
				toFocus = this.headers[ ( currentIndex + 1 ) % length ];
				break;
			case keyCode.LEFT:
			case keyCode.UP:
				toFocus = this.headers[ ( currentIndex - 1 + length ) % length ];
				break;
			case keyCode.SPACE:
			case keyCode.ENTER:
				this._clickHandler( { target: event.target }, event.target );
				event.preventDefault();
		}

		if ( toFocus ) {
			$( event.target ).attr( "tabIndex", -1 );
			$( toFocus ).attr( "tabIndex", 0 );
			toFocus.focus();
			return false;
		}

		return true;
	},

	resize: function() {
		var options = this.options,
			maxHeight;

		if ( options.fillSpace ) {
			if ( $.browser.msie ) {
				var defOverflow = this.element.parent().css( "overflow" );
				this.element.parent().css( "overflow", "hidden");
			}
			maxHeight = this.element.parent().height();
			if ($.browser.msie) {
				this.element.parent().css( "overflow", defOverflow );
			}

			this.headers.each(function() {
				maxHeight -= $( this ).outerHeight( true );
			});

			this.headers.next()
				.each(function() {
					$( this ).height( Math.max( 0, maxHeight -
						$( this ).innerHeight() + $( this ).height() ) );
				})
				.css( "overflow", "auto" );
		} else if ( options.autoHeight ) {
			maxHeight = 0;
			this.headers.next()
				.each(function() {
					maxHeight = Math.max( maxHeight, $( this ).height( "" ).height() );
				})
				.height( maxHeight );
		}

		return this;
	},

	activate: function( index ) {
		// TODO this gets called on init, changing the option without an explicit call for that
		this.options.active = index;
		// call clickHandler with custom event
		var active = this._findActive( index )[ 0 ];
		this._clickHandler( { target: active }, active );

		return this;
	},

	_findActive: function( selector ) {
		return selector
			? typeof selector === "number"
				? this.headers.filter( ":eq(" + selector + ")" )
				: this.headers.not( this.headers.not( selector ) )
			: selector === false
				? $( [] )
				: this.headers.filter( ":eq(0)" );
	},

	// TODO isn't event.target enough? why the separate target argument?
	_clickHandler: function( event, target ) {
		var options = this.options;
		if ( options.disabled ) {
			return;
		}

		// called only when using activate(false) to close all parts programmatically
		if ( !event.target ) {
			if ( !options.collapsible ) {
				return;
			}
			this.active
				.removeClass( "ui-state-active ui-corner-top" )
				.addClass( "ui-state-default ui-corner-all" )
				.children( ".ui-icon" )
					.removeClass( options.icons.headerSelected )
					.addClass( options.icons.header );
			this.active.next().addClass( "ui-accordion-content-active" );
			var toHide = this.active.next(),
				data = {
					options: options,
					newHeader: $( [] ),
					oldHeader: options.active,
					newContent: $( [] ),
					oldContent: toHide
				},
				toShow = ( this.active = $( [] ) );
			this._toggle( toShow, toHide, data );
			return;
		}

		// get the click target
		var clicked = $( event.currentTarget || target ),
			clickedIsActive = clicked[0] === this.active[0];

		// TODO the option is changed, is that correct?
		// TODO if it is correct, shouldn't that happen after determining that the click is valid?
		options.active = options.collapsible && clickedIsActive ?
			false :
			this.headers.index( clicked );

		// if animations are still active, or the active header is the target, ignore click
		if ( this.running || ( !options.collapsible && clickedIsActive ) ) {
			return;
		}

		// find elements to show and hide
		var active = this.active,
			toShow = clicked.next(),
			toHide = this.active.next(),
			data = {
				options: options,
				newHeader: clickedIsActive && options.collapsible ? $([]) : clicked,
				oldHeader: this.active,
				newContent: clickedIsActive && options.collapsible ? $([]) : toShow,
				oldContent: toHide
			},
			down = this.headers.index( this.active[0] ) > this.headers.index( clicked[0] );

		// when the call to ._toggle() comes after the class changes
		// it causes a very odd bug in IE 8 (see #6720)
		this.active = clickedIsActive ? $([]) : clicked;
		this._toggle( toShow, toHide, data, clickedIsActive, down );

		// switch classes
		active
			.removeClass( "ui-state-active ui-corner-top" )
			.addClass( "ui-state-default ui-corner-all" )
			.children( ".ui-icon" )
				.removeClass( options.icons.headerSelected )
				.addClass( options.icons.header );
		if ( !clickedIsActive ) {
			clicked
				.removeClass( "ui-state-default ui-corner-all" )
				.addClass( "ui-state-active ui-corner-top" )
				.children( ".ui-icon" )
					.removeClass( options.icons.header )
					.addClass( options.icons.headerSelected );
			clicked
				.next()
				.addClass( "ui-accordion-content-active" );
		}

		return;
	},

	_toggle: function( toShow, toHide, data, clickedIsActive, down ) {
		var self = this,
			options = self.options;

		self.toShow = toShow;
		self.toHide = toHide;
		self.data = data;

		var complete = function() {
			if ( !self ) {
				return;
			}
			return self._completed.apply( self, arguments );
		};

		// trigger changestart event
		self._trigger( "changestart", null, self.data );

		// count elements to animate
		self.running = toHide.size() === 0 ? toShow.size() : toHide.size();

		if ( options.animated ) {
			var animOptions = {};

			if ( options.collapsible && clickedIsActive ) {
				animOptions = {
					toShow: $( [] ),
					toHide: toHide,
					complete: complete,
					down: down,
					autoHeight: options.autoHeight || options.fillSpace
				};
			} else {
				animOptions = {
					toShow: toShow,
					toHide: toHide,
					complete: complete,
					down: down,
					autoHeight: options.autoHeight || options.fillSpace
				};
			}

			if ( !options.proxied ) {
				options.proxied = options.animated;
			}

			if ( !options.proxiedDuration ) {
				options.proxiedDuration = options.duration;
			}

			options.animated = $.isFunction( options.proxied ) ?
				options.proxied( animOptions ) :
				options.proxied;

			options.duration = $.isFunction( options.proxiedDuration ) ?
				options.proxiedDuration( animOptions ) :
				options.proxiedDuration;

			var animations = $.ui.accordion.animations,
				duration = options.duration,
				easing = options.animated;

			if ( easing && !animations[ easing ] && !$.easing[ easing ] ) {
				easing = "slide";
			}
			if ( !animations[ easing ] ) {
				animations[ easing ] = function( options ) {
					this.slide( options, {
						easing: easing,
						duration: duration || 700
					});
				};
			}

			animations[ easing ]( animOptions );
		} else {
			if ( options.collapsible && clickedIsActive ) {
				toShow.toggle();
			} else {
				toHide.hide();
				toShow.show();
			}

			complete( true );
		}

		// TODO assert that the blur and focus triggers are really necessary, remove otherwise
		toHide.prev()
			.attr({
				"aria-expanded": "false",
				"aria-selected": "false",
				tabIndex: -1
			})
			.blur();
		toShow.prev()
			.attr({
				"aria-expanded": "true",
				"aria-selected": "true",
				tabIndex: 0
			})
			.focus();
	},

	_completed: function( cancel ) {
		this.running = cancel ? 0 : --this.running;
		if ( this.running ) {
			return;
		}

		if ( this.options.clearStyle ) {
			this.toShow.add( this.toHide ).css({
				height: "",
				overflow: ""
			});
		}

		// other classes are removed before the animation; this one needs to stay until completed
		this.toHide.removeClass( "ui-accordion-content-active" );
		// Work around for rendering bug in IE (#5421)
		if ( this.toHide.length ) {
			this.toHide.parent()[0].className = this.toHide.parent()[0].className;
		}

		this._trigger( "change", null, this.data );
	}
});

$.extend( $.ui.accordion, {
	version: "1.8.16",
	animations: {
		slide: function( options, additions ) {
			options = $.extend({
				easing: "swing",
				duration: 300
			}, options, additions );
			if ( !options.toHide.size() ) {
				options.toShow.animate({
					height: "show",
					paddingTop: "show",
					paddingBottom: "show"
				}, options );
				return;
			}
			if ( !options.toShow.size() ) {
				options.toHide.animate({
					height: "hide",
					paddingTop: "hide",
					paddingBottom: "hide"
				}, options );
				return;
			}
			var overflow = options.toShow.css( "overflow" ),
				percentDone = 0,
				showProps = {},
				hideProps = {},
				fxAttrs = [ "height", "paddingTop", "paddingBottom" ],
				originalWidth;
			// fix width before calculating height of hidden element
			var s = options.toShow;
			originalWidth = s[0].style.width;
			s.width( parseInt( s.parent().width(), 10 )
				- parseInt( s.css( "paddingLeft" ), 10 )
				- parseInt( s.css( "paddingRight" ), 10 )
				- ( parseInt( s.css( "borderLeftWidth" ), 10 ) || 0 )
				- ( parseInt( s.css( "borderRightWidth" ), 10) || 0 ) );

			$.each( fxAttrs, function( i, prop ) {
				hideProps[ prop ] = "hide";

				var parts = ( "" + $.css( options.toShow[0], prop ) ).match( /^([\d+-.]+)(.*)$/ );
				showProps[ prop ] = {
					value: parts[ 1 ],
					unit: parts[ 2 ] || "px"
				};
			});
			options.toShow.css({ height: 0, overflow: "hidden" }).show();
			options.toHide
				.filter( ":hidden" )
					.each( options.complete )
				.end()
				.filter( ":visible" )
				.animate( hideProps, {
				step: function( now, settings ) {
					// only calculate the percent when animating height
					// IE gets very inconsistent results when animating elements
					// with small values, which is common for padding
					if ( settings.prop == "height" ) {
						percentDone = ( settings.end - settings.start === 0 ) ? 0 :
							( settings.now - settings.start ) / ( settings.end - settings.start );
					}

					options.toShow[ 0 ].style[ settings.prop ] =
						( percentDone * showProps[ settings.prop ].value )
						+ showProps[ settings.prop ].unit;
				},
				duration: options.duration,
				easing: options.easing,
				complete: function() {
					if ( !options.autoHeight ) {
						options.toShow.css( "height", "" );
					}
					options.toShow.css({
						width: originalWidth,
						overflow: overflow
					});
					options.complete();
				}
			});
		},
		bounceslide: function( options ) {
			this.slide( options, {
				easing: options.down ? "easeOutBounce" : "swing",
				duration: options.down ? 1000 : 200
			});
		}
	}
});

})( jQuery );