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Edit File : accordion.js \| Size : 15.76 KB
/! jQuery UI Accordion 1.13.3 * https://jqueryui.com * * Copyright OpenJS Foundation and other contributors * Released under the MIT license. * https://jquery.org/license / //>>label: Accordion //>>group: Widgets / eslint-disable max-len / //>>description: Displays collapsible content panels for presenting information in a limited amount of space. / eslint-enable max-len */ //>>docs: https://api.jqueryui.com/accordion/ //>>demos: https://jqueryui.com/accordion/ //>>css.structure: ../../themes/base/core.css //>>css.structure: ../../themes/base/accordion.css //>>css.theme: ../../themes/base/theme.css ( function( factory ) { "use strict"; if ( typeof define === "function" && define.amd ) { // AMD. Register as an anonymous module. define( [ "jquery", "../version", "../keycode", "../unique-id", "../widget" ], factory ); } else { // Browser globals factory( jQuery ); } } )( function( $ ) { "use strict"; return $.widget( "ui.accordion", { version: "1.13.3", options: { active: 0, animate: {}, classes: { "ui-accordion-header": "ui-corner-top", "ui-accordion-header-collapsed": "ui-corner-all", "ui-accordion-content": "ui-corner-bottom" }, collapsible: false, event: "click", header: function( elem ) { return elem.find( "> li > :first-child" ).add( elem.find( "> :not(li)" ).even() ); }, heightStyle: "auto", icons: { activeHeader: "ui-icon-triangle-1-s", header: "ui-icon-triangle-1-e" }, // Callbacks activate: null, beforeActivate: null }, hideProps: { borderTopWidth: "hide", borderBottomWidth: "hide", paddingTop: "hide", paddingBottom: "hide", height: "hide" }, showProps: { borderTopWidth: "show", borderBottomWidth: "show", paddingTop: "show", paddingBottom: "show", height: "show" }, _create: function() { var options = this.options; this.prevShow = this.prevHide = $(); this._addClass( "ui-accordion", "ui-widget ui-helper-reset" ); this.element.attr( "role", "tablist" ); // Don't allow collapsible: false and active: false / null if ( !options.collapsible && ( options.active === false \|\| options.active == null ) ) { options.active = 0; } this._processPanels(); // handle negative values if ( options.active < 0 ) { options.active += this.headers.length; } this._refresh(); }, _getCreateEventData: function() { return { header: this.active, panel: !this.active.length ? $() : this.active.next() }; }, _createIcons: function() { var icon, children, icons = this.options.icons; if ( icons ) { icon = $( "<span>" ); this._addClass( icon, "ui-accordion-header-icon", "ui-icon " + icons.header ); icon.prependTo( this.headers ); children = this.active.children( ".ui-accordion-header-icon" ); this._removeClass( children, icons.header ) ._addClass( children, null, icons.activeHeader ) ._addClass( this.headers, "ui-accordion-icons" ); } }, _destroyIcons: function() { this._removeClass( this.headers, "ui-accordion-icons" ); this.headers.children( ".ui-accordion-header-icon" ).remove(); }, _destroy: function() { var contents; // Clean up main element this.element.removeAttr( "role" ); // Clean up headers this.headers .removeAttr( "role aria-expanded aria-selected aria-controls tabIndex" ) .removeUniqueId(); this._destroyIcons(); // Clean up content panels contents = this.headers.next() .css( "display", "" ) .removeAttr( "role aria-hidden aria-labelledby" ) .removeUniqueId(); if ( this.options.heightStyle !== "content" ) { contents.css( "height", "" ); } }, _setOption: function( key, value ) { if ( key === "active" ) { // _activate() will handle invalid values and update this.options this._activate( value ); return; } if ( key === "event" ) { if ( this.options.event ) { this._off( this.headers, this.options.event ); } this._setupEvents( value ); } this._super( key, value ); // Setting collapsible: false while collapsed; open first panel if ( key === "collapsible" && !value && this.options.active === false ) { this._activate( 0 ); } if ( key === "icons" ) { this._destroyIcons(); if ( value ) { this._createIcons(); } } }, _setOptionDisabled: function( value ) { this._super( value ); this.element.attr( "aria-disabled", value ); // Support: IE8 Only // #5332 / #6059 - opacity doesn't cascade to positioned elements in IE // so we need to add the disabled class to the headers and panels this._toggleClass( null, "ui-state-disabled", !!value ); this._toggleClass( this.headers.add( this.headers.next() ), null, "ui-state-disabled", !!value ); }, _keydown: function( event ) { if ( 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._eventHandler( event ); break; case keyCode.HOME: toFocus = this.headers[ 0 ]; break; case keyCode.END: toFocus = this.headers[ length - 1 ]; break; } if ( toFocus ) { $( event.target ).attr( "tabIndex", -1 ); $( toFocus ).attr( "tabIndex", 0 ); $( toFocus ).trigger( "focus" ); event.preventDefault(); } }, _panelKeyDown: function( event ) { if ( event.keyCode === $.ui.keyCode.UP && event.ctrlKey ) { $( event.currentTarget ).prev().trigger( "focus" ); } }, refresh: function() { var options = this.options; this._processPanels(); // Was collapsed or no panel if ( ( options.active === false && options.collapsible === true ) \|\| !this.headers.length ) { options.active = false; this.active = $(); // active false only when collapsible is true } else if ( options.active === false ) { this._activate( 0 ); // was active, but active panel is gone } else if ( this.active.length && !$.contains( this.element[ 0 ], this.active[ 0 ] ) ) { // all remaining panel are disabled if ( this.headers.length === this.headers.find( ".ui-state-disabled" ).length ) { options.active = false; this.active = $(); // activate previous panel } else { this._activate( Math.max( 0, options.active - 1 ) ); } // was active, active panel still exists } else { // make sure active index is correct options.active = this.headers.index( this.active ); } this._destroyIcons(); this._refresh(); }, _processPanels: function() { var prevHeaders = this.headers, prevPanels = this.panels; if ( typeof this.options.header === "function" ) { this.headers = this.options.header( this.element ); } else { this.headers = this.element.find( this.options.header ); } this._addClass( this.headers, "ui-accordion-header ui-accordion-header-collapsed", "ui-state-default" ); this.panels = this.headers.next().filter( ":not(.ui-accordion-content-active)" ).hide(); this._addClass( this.panels, "ui-accordion-content", "ui-helper-reset ui-widget-content" ); // Avoid memory leaks (#10056) if ( prevPanels ) { this._off( prevHeaders.not( this.headers ) ); this._off( prevPanels.not( this.panels ) ); } }, _refresh: function() { var maxHeight, options = this.options, heightStyle = options.heightStyle, parent = this.element.parent(); this.active = this._findActive( options.active ); this._addClass( this.active, "ui-accordion-header-active", "ui-state-active" ) ._removeClass( this.active, "ui-accordion-header-collapsed" ); this._addClass( this.active.next(), "ui-accordion-content-active" ); this.active.next().show(); this.headers .attr( "role", "tab" ) .each( function() { var header = $( this ), headerId = header.uniqueId().attr( "id" ), panel = header.next(), panelId = panel.uniqueId().attr( "id" ); header.attr( "aria-controls", panelId ); panel.attr( "aria-labelledby", headerId ); } ) .next() .attr( "role", "tabpanel" ); this.headers .not( this.active ) .attr( { "aria-selected": "false", "aria-expanded": "false", tabIndex: -1 } ) .next() .attr( { "aria-hidden": "true" } ) .hide(); // Make sure at least one header is in the tab order if ( !this.active.length ) { this.headers.eq( 0 ).attr( "tabIndex", 0 ); } else { this.active.attr( { "aria-selected": "true", "aria-expanded": "true", tabIndex: 0 } ) .next() .attr( { "aria-hidden": "false" } ); } this._createIcons(); this._setupEvents( options.event ); if ( heightStyle === "fill" ) { maxHeight = parent.height(); this.element.siblings( ":visible" ).each( function() { var elem = $( this ), position = elem.css( "position" ); if ( position === "absolute" \|\| position === "fixed" ) { return; } maxHeight -= elem.outerHeight( true ); } ); 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 ( heightStyle === "auto" ) { maxHeight = 0; this.headers.next() .each( function() { var isVisible = $( this ).is( ":visible" ); if ( !isVisible ) { $( this ).show(); } maxHeight = Math.max( maxHeight, $( this ).css( "height", "" ).height() ); if ( !isVisible ) { $( this ).hide(); } } ) .height( maxHeight ); } }, _activate: function( index ) { var active = this._findActive( index )[ 0 ]; // Trying to activate the already active panel if ( active === this.active[ 0 ] ) { return; } // Trying to collapse, simulate a click on the currently active header active = active \|\| this.active[ 0 ]; this._eventHandler( { target: active, currentTarget: active, preventDefault: $.noop } ); }, _findActive: function( selector ) { return typeof selector === "number" ? this.headers.eq( selector ) : $(); }, _setupEvents: function( event ) { var events = { keydown: "_keydown" }; if ( event ) { $.each( event.split( " " ), function( index, eventName ) { events[ eventName ] = "_eventHandler"; } ); } this._off( this.headers.add( this.headers.next() ) ); this._on( this.headers, events ); this._on( this.headers.next(), { keydown: "_panelKeyDown" } ); this._hoverable( this.headers ); this._focusable( this.headers ); }, _eventHandler: function( event ) { var activeChildren, clickedChildren, options = this.options, active = this.active, clicked = $( event.currentTarget ), clickedIsActive = clicked[ 0 ] === active[ 0 ], collapsing = clickedIsActive && options.collapsible, toShow = collapsing ? $() : clicked.next(), toHide = active.next(), eventData = { oldHeader: active, oldPanel: toHide, newHeader: collapsing ? $() : clicked, newPanel: toShow }; event.preventDefault(); if ( // click on active header, but not collapsible ( clickedIsActive && !options.collapsible ) \|\| // allow canceling activation ( this._trigger( "beforeActivate", event, eventData ) === false ) ) { return; } options.active = collapsing ? false : this.headers.index( clicked ); // 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( eventData ); // Switch classes // corner classes on the previously active header stay after the animation this._removeClass( active, "ui-accordion-header-active", "ui-state-active" ); if ( options.icons ) { activeChildren = active.children( ".ui-accordion-header-icon" ); this._removeClass( activeChildren, null, options.icons.activeHeader ) ._addClass( activeChildren, null, options.icons.header ); } if ( !clickedIsActive ) { this._removeClass( clicked, "ui-accordion-header-collapsed" ) ._addClass( clicked, "ui-accordion-header-active", "ui-state-active" ); if ( options.icons ) { clickedChildren = clicked.children( ".ui-accordion-header-icon" ); this._removeClass( clickedChildren, null, options.icons.header ) ._addClass( clickedChildren, null, options.icons.activeHeader ); } this._addClass( clicked.next(), "ui-accordion-content-active" ); } }, _toggle: function( data ) { var toShow = data.newPanel, toHide = this.prevShow.length ? this.prevShow : data.oldPanel; // Handle activating a panel during the animation for another activation this.prevShow.add( this.prevHide ).stop( true, true ); this.prevShow = toShow; this.prevHide = toHide; if ( this.options.animate ) { this._animate( toShow, toHide, data ); } else { toHide.hide(); toShow.show(); this._toggleComplete( data ); } toHide.attr( { "aria-hidden": "true" } ); toHide.prev().attr( { "aria-selected": "false", "aria-expanded": "false" } ); // if we're switching panels, remove the old header from the tab order // if we're opening from collapsed state, remove the previous header from the tab order // if we're collapsing, then keep the collapsing header in the tab order if ( toShow.length && toHide.length ) { toHide.prev().attr( { "tabIndex": -1, "aria-expanded": "false" } ); } else if ( toShow.length ) { this.headers.filter( function() { return parseInt( $( this ).attr( "tabIndex" ), 10 ) === 0; } ) .attr( "tabIndex", -1 ); } toShow .attr( "aria-hidden", "false" ) .prev() .attr( { "aria-selected": "true", "aria-expanded": "true", tabIndex: 0 } ); }, _animate: function( toShow, toHide, data ) { var total, easing, duration, that = this, adjust = 0, boxSizing = toShow.css( "box-sizing" ), down = toShow.length && ( !toHide.length \|\| ( toShow.index() < toHide.index() ) ), animate = this.options.animate \|\| {}, options = down && animate.down \|\| animate, complete = function() { that._toggleComplete( data ); }; if ( typeof options === "number" ) { duration = options; } if ( typeof options === "string" ) { easing = options; } // fall back from options to animation in case of partial down settings easing = easing \|\| options.easing \|\| animate.easing; duration = duration \|\| options.duration \|\| animate.duration; if ( !toHide.length ) { return toShow.animate( this.showProps, duration, easing, complete ); } if ( !toShow.length ) { return toHide.animate( this.hideProps, duration, easing, complete ); } total = toShow.show().outerHeight(); toHide.animate( this.hideProps, { duration: duration, easing: easing, step: function( now, fx ) { fx.now = Math.round( now ); } } ); toShow .hide() .animate( this.showProps, { duration: duration, easing: easing, complete: complete, step: function( now, fx ) { fx.now = Math.round( now ); if ( fx.prop !== "height" ) { if ( boxSizing === "content-box" ) { adjust += fx.now; } } else if ( that.options.heightStyle !== "content" ) { fx.now = Math.round( total - toHide.outerHeight() - adjust ); adjust = 0; } } } ); }, _toggleComplete: function( data ) { var toHide = data.oldPanel, prev = toHide.prev(); this._removeClass( toHide, "ui-accordion-content-active" ); this._removeClass( prev, "ui-accordion-header-active" ) ._addClass( prev, "ui-accordion-header-collapsed" ); // Work around for rendering bug in IE (#5421) if ( toHide.length ) { toHide.parent()[ 0 ].className = toHide.parent()[ 0 ].className; } this._trigger( "activate", null, data ); } } ); } ); Back

Edit File : accordion.js | Size : 15.76 KB

/*!
 * jQuery UI Accordion 1.13.3
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Accordion
//>>group: Widgets
/* eslint-disable max-len */
//>>description: Displays collapsible content panels for presenting information in a limited amount of space.
/* eslint-enable max-len */
//>>docs: https://api.jqueryui.com/accordion/
//>>demos: https://jqueryui.com/accordion/
//>>css.structure: ../../themes/base/core.css
//>>css.structure: ../../themes/base/accordion.css
//>>css.theme: ../../themes/base/theme.css

( function( factory ) {
	"use strict";

if ( typeof define === "function" && define.amd ) {

// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"../version",
			"../keycode",
			"../unique-id",
			"../widget"
		], factory );
	} else {

// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
"use strict";

return $.widget( "ui.accordion", {
	version: "1.13.3",
	options: {
		active: 0,
		animate: {},
		classes: {
			"ui-accordion-header": "ui-corner-top",
			"ui-accordion-header-collapsed": "ui-corner-all",
			"ui-accordion-content": "ui-corner-bottom"
		},
		collapsible: false,
		event: "click",
		header: function( elem ) {
			return elem.find( "> li > :first-child" ).add( elem.find( "> :not(li)" ).even() );
		},
		heightStyle: "auto",
		icons: {
			activeHeader: "ui-icon-triangle-1-s",
			header: "ui-icon-triangle-1-e"
		},

// Callbacks
		activate: null,
		beforeActivate: null
	},

hideProps: {
		borderTopWidth: "hide",
		borderBottomWidth: "hide",
		paddingTop: "hide",
		paddingBottom: "hide",
		height: "hide"
	},

showProps: {
		borderTopWidth: "show",
		borderBottomWidth: "show",
		paddingTop: "show",
		paddingBottom: "show",
		height: "show"
	},

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

this.prevShow = this.prevHide = $();
		this._addClass( "ui-accordion", "ui-widget ui-helper-reset" );
		this.element.attr( "role", "tablist" );

// Don't allow collapsible: false and active: false / null
		if ( !options.collapsible && ( options.active === false || options.active == null ) ) {
			options.active = 0;
		}

this._processPanels();

// handle negative values
		if ( options.active < 0 ) {
			options.active += this.headers.length;
		}
		this._refresh();
	},

_getCreateEventData: function() {
		return {
			header: this.active,
			panel: !this.active.length ? $() : this.active.next()
		};
	},

_createIcons: function() {
		var icon, children,
			icons = this.options.icons;

if ( icons ) {
			icon = $( "<span>" );
			this._addClass( icon, "ui-accordion-header-icon", "ui-icon " + icons.header );
			icon.prependTo( this.headers );
			children = this.active.children( ".ui-accordion-header-icon" );
			this._removeClass( children, icons.header )
				._addClass( children, null, icons.activeHeader )
				._addClass( this.headers, "ui-accordion-icons" );
		}
	},

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

_destroy: function() {
		var contents;

// Clean up main element
		this.element.removeAttr( "role" );

// Clean up headers
		this.headers
			.removeAttr( "role aria-expanded aria-selected aria-controls tabIndex" )
			.removeUniqueId();

this._destroyIcons();

// Clean up content panels
		contents = this.headers.next()
			.css( "display", "" )
			.removeAttr( "role aria-hidden aria-labelledby" )
			.removeUniqueId();

if ( this.options.heightStyle !== "content" ) {
			contents.css( "height", "" );
		}
	},

_setOption: function( key, value ) {
		if ( key === "active" ) {

// _activate() will handle invalid values and update this.options
			this._activate( value );
			return;
		}

if ( key === "event" ) {
			if ( this.options.event ) {
				this._off( this.headers, this.options.event );
			}
			this._setupEvents( value );
		}

this._super( key, value );

// Setting collapsible: false while collapsed; open first panel
		if ( key === "collapsible" && !value && this.options.active === false ) {
			this._activate( 0 );
		}

if ( key === "icons" ) {
			this._destroyIcons();
			if ( value ) {
				this._createIcons();
			}
		}
	},

_setOptionDisabled: function( value ) {
		this._super( value );

this.element.attr( "aria-disabled", value );

// Support: IE8 Only
		// #5332 / #6059 - opacity doesn't cascade to positioned elements in IE
		// so we need to add the disabled class to the headers and panels
		this._toggleClass( null, "ui-state-disabled", !!value );
		this._toggleClass( this.headers.add( this.headers.next() ), null, "ui-state-disabled",
			!!value );
	},

_keydown: function( event ) {
		if ( 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._eventHandler( event );
			break;
		case keyCode.HOME:
			toFocus = this.headers[ 0 ];
			break;
		case keyCode.END:
			toFocus = this.headers[ length - 1 ];
			break;
		}

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

_panelKeyDown: function( event ) {
		if ( event.keyCode === $.ui.keyCode.UP && event.ctrlKey ) {
			$( event.currentTarget ).prev().trigger( "focus" );
		}
	},

refresh: function() {
		var options = this.options;
		this._processPanels();

// Was collapsed or no panel
		if ( ( options.active === false && options.collapsible === true ) ||
				!this.headers.length ) {
			options.active = false;
			this.active = $();

// active false only when collapsible is true
		} else if ( options.active === false ) {
			this._activate( 0 );

// was active, but active panel is gone
		} else if ( this.active.length && !$.contains( this.element[ 0 ], this.active[ 0 ] ) ) {

// all remaining panel are disabled
			if ( this.headers.length === this.headers.find( ".ui-state-disabled" ).length ) {
				options.active = false;
				this.active = $();

// activate previous panel
			} else {
				this._activate( Math.max( 0, options.active - 1 ) );
			}

// was active, active panel still exists
		} else {

// make sure active index is correct
			options.active = this.headers.index( this.active );
		}

this._destroyIcons();

this._refresh();
	},

_processPanels: function() {
		var prevHeaders = this.headers,
			prevPanels = this.panels;

if ( typeof this.options.header === "function" ) {
			this.headers = this.options.header( this.element );
		} else {
			this.headers = this.element.find( this.options.header );
		}
		this._addClass( this.headers, "ui-accordion-header ui-accordion-header-collapsed",
			"ui-state-default" );

this.panels = this.headers.next().filter( ":not(.ui-accordion-content-active)" ).hide();
		this._addClass( this.panels, "ui-accordion-content", "ui-helper-reset ui-widget-content" );

// Avoid memory leaks (#10056)
		if ( prevPanels ) {
			this._off( prevHeaders.not( this.headers ) );
			this._off( prevPanels.not( this.panels ) );
		}
	},

_refresh: function() {
		var maxHeight,
			options = this.options,
			heightStyle = options.heightStyle,
			parent = this.element.parent();

this.active = this._findActive( options.active );
		this._addClass( this.active, "ui-accordion-header-active", "ui-state-active" )
			._removeClass( this.active, "ui-accordion-header-collapsed" );
		this._addClass( this.active.next(), "ui-accordion-content-active" );
		this.active.next().show();

this.headers
			.attr( "role", "tab" )
			.each( function() {
				var header = $( this ),
					headerId = header.uniqueId().attr( "id" ),
					panel = header.next(),
					panelId = panel.uniqueId().attr( "id" );
				header.attr( "aria-controls", panelId );
				panel.attr( "aria-labelledby", headerId );
			} )
			.next()
				.attr( "role", "tabpanel" );

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

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

this._createIcons();

this._setupEvents( options.event );

if ( heightStyle === "fill" ) {
			maxHeight = parent.height();
			this.element.siblings( ":visible" ).each( function() {
				var elem = $( this ),
					position = elem.css( "position" );

if ( position === "absolute" || position === "fixed" ) {
					return;
				}
				maxHeight -= elem.outerHeight( true );
			} );

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 ( heightStyle === "auto" ) {
			maxHeight = 0;
			this.headers.next()
				.each( function() {
					var isVisible = $( this ).is( ":visible" );
					if ( !isVisible ) {
						$( this ).show();
					}
					maxHeight = Math.max( maxHeight, $( this ).css( "height", "" ).height() );
					if ( !isVisible ) {
						$( this ).hide();
					}
				} )
				.height( maxHeight );
		}
	},

_activate: function( index ) {
		var active = this._findActive( index )[ 0 ];

// Trying to activate the already active panel
		if ( active === this.active[ 0 ] ) {
			return;
		}

// Trying to collapse, simulate a click on the currently active header
		active = active || this.active[ 0 ];

this._eventHandler( {
			target: active,
			currentTarget: active,
			preventDefault: $.noop
		} );
	},

_findActive: function( selector ) {
		return typeof selector === "number" ? this.headers.eq( selector ) : $();
	},

_setupEvents: function( event ) {
		var events = {
			keydown: "_keydown"
		};
		if ( event ) {
			$.each( event.split( " " ), function( index, eventName ) {
				events[ eventName ] = "_eventHandler";
			} );
		}

this._off( this.headers.add( this.headers.next() ) );
		this._on( this.headers, events );
		this._on( this.headers.next(), { keydown: "_panelKeyDown" } );
		this._hoverable( this.headers );
		this._focusable( this.headers );
	},

_eventHandler: function( event ) {
		var activeChildren, clickedChildren,
			options = this.options,
			active = this.active,
			clicked = $( event.currentTarget ),
			clickedIsActive = clicked[ 0 ] === active[ 0 ],
			collapsing = clickedIsActive && options.collapsible,
			toShow = collapsing ? $() : clicked.next(),
			toHide = active.next(),
			eventData = {
				oldHeader: active,
				oldPanel: toHide,
				newHeader: collapsing ? $() : clicked,
				newPanel: toShow
			};

event.preventDefault();

if (

// click on active header, but not collapsible
				( clickedIsActive && !options.collapsible ) ||

// allow canceling activation
				( this._trigger( "beforeActivate", event, eventData ) === false ) ) {
			return;
		}

options.active = collapsing ? false : this.headers.index( clicked );

// 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( eventData );

// Switch classes
		// corner classes on the previously active header stay after the animation
		this._removeClass( active, "ui-accordion-header-active", "ui-state-active" );
		if ( options.icons ) {
			activeChildren = active.children( ".ui-accordion-header-icon" );
			this._removeClass( activeChildren, null, options.icons.activeHeader )
				._addClass( activeChildren, null, options.icons.header );
		}

if ( !clickedIsActive ) {
			this._removeClass( clicked, "ui-accordion-header-collapsed" )
				._addClass( clicked, "ui-accordion-header-active", "ui-state-active" );
			if ( options.icons ) {
				clickedChildren = clicked.children( ".ui-accordion-header-icon" );
				this._removeClass( clickedChildren, null, options.icons.header )
					._addClass( clickedChildren, null, options.icons.activeHeader );
			}

this._addClass( clicked.next(), "ui-accordion-content-active" );
		}
	},

_toggle: function( data ) {
		var toShow = data.newPanel,
			toHide = this.prevShow.length ? this.prevShow : data.oldPanel;

// Handle activating a panel during the animation for another activation
		this.prevShow.add( this.prevHide ).stop( true, true );
		this.prevShow = toShow;
		this.prevHide = toHide;

if ( this.options.animate ) {
			this._animate( toShow, toHide, data );
		} else {
			toHide.hide();
			toShow.show();
			this._toggleComplete( data );
		}

toHide.attr( {
			"aria-hidden": "true"
		} );
		toHide.prev().attr( {
			"aria-selected": "false",
			"aria-expanded": "false"
		} );

// if we're switching panels, remove the old header from the tab order
		// if we're opening from collapsed state, remove the previous header from the tab order
		// if we're collapsing, then keep the collapsing header in the tab order
		if ( toShow.length && toHide.length ) {
			toHide.prev().attr( {
				"tabIndex": -1,
				"aria-expanded": "false"
			} );
		} else if ( toShow.length ) {
			this.headers.filter( function() {
				return parseInt( $( this ).attr( "tabIndex" ), 10 ) === 0;
			} )
				.attr( "tabIndex", -1 );
		}

toShow
			.attr( "aria-hidden", "false" )
			.prev()
				.attr( {
					"aria-selected": "true",
					"aria-expanded": "true",
					tabIndex: 0
				} );
	},

_animate: function( toShow, toHide, data ) {
		var total, easing, duration,
			that = this,
			adjust = 0,
			boxSizing = toShow.css( "box-sizing" ),
			down = toShow.length &&
				( !toHide.length || ( toShow.index() < toHide.index() ) ),
			animate = this.options.animate || {},
			options = down && animate.down || animate,
			complete = function() {
				that._toggleComplete( data );
			};

if ( typeof options === "number" ) {
			duration = options;
		}
		if ( typeof options === "string" ) {
			easing = options;
		}

// fall back from options to animation in case of partial down settings
		easing = easing || options.easing || animate.easing;
		duration = duration || options.duration || animate.duration;

if ( !toHide.length ) {
			return toShow.animate( this.showProps, duration, easing, complete );
		}
		if ( !toShow.length ) {
			return toHide.animate( this.hideProps, duration, easing, complete );
		}

total = toShow.show().outerHeight();
		toHide.animate( this.hideProps, {
			duration: duration,
			easing: easing,
			step: function( now, fx ) {
				fx.now = Math.round( now );
			}
		} );
		toShow
			.hide()
			.animate( this.showProps, {
				duration: duration,
				easing: easing,
				complete: complete,
				step: function( now, fx ) {
					fx.now = Math.round( now );
					if ( fx.prop !== "height" ) {
						if ( boxSizing === "content-box" ) {
							adjust += fx.now;
						}
					} else if ( that.options.heightStyle !== "content" ) {
						fx.now = Math.round( total - toHide.outerHeight() - adjust );
						adjust = 0;
					}
				}
			} );
	},

_toggleComplete: function( data ) {
		var toHide = data.oldPanel,
			prev = toHide.prev();

this._removeClass( toHide, "ui-accordion-content-active" );
		this._removeClass( prev, "ui-accordion-header-active" )
			._addClass( prev, "ui-accordion-header-collapsed" );

// Work around for rendering bug in IE (#5421)
		if ( toHide.length ) {
			toHide.parent()[ 0 ].className = toHide.parent()[ 0 ].className;
		}
		this._trigger( "activate", null, data );
	}
} );

} );

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