Tabs: Move tabs into widgets directory

Ref #13885

1 files changed, 902 insertions, 0 deletions

diff --git a/ui/widgets/tabs.js b/ui/widgets/tabs.js
new file mode 100644
index 000000000..0b7bf5850
--- /dev/null
+++ b/ui/widgets/tabs.js
@@ -0,0 +1,902 @@
+/*!
+ * jQuery UI Tabs @VERSION
+ * http://jqueryui.com
+ *
+ * Copyright jQuery Foundation and other contributors
+ * Released under the MIT license.
+ * http://jquery.org/license
+ */
+
+//>>label: Tabs
+//>>group: Widgets
+//>>description: Transforms a set of container elements into a tab structure.
+//>>docs: http://api.jqueryui.com/tabs/
+//>>demos: http://jqueryui.com/tabs/
+//>>css.structure: ../themes/base/core.css
+//>>css.structure: ../themes/base/tabs.css
+//>>css.theme: ../themes/base/theme.css
+
+( function( factory ) {
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define( [
+			"jquery",
+			"../escape-selector",
+			"../keycode",
+			"../safe-active-element",
+			"../unique-id",
+			"../version",
+			"../widget"
+		], factory );
+	} else {
+
+		// Browser globals
+		factory( jQuery );
+	}
+}( function( $ ) {
+
+$.widget( "ui.tabs", {
+	version: "@VERSION",
+	delay: 300,
+	options: {
+		active: null,
+		classes: {
+			"ui-tabs": "ui-corner-all",
+			"ui-tabs-nav": "ui-corner-all",
+			"ui-tab": "ui-corner-top",
+			"ui-tabs-panel": "ui-corner-bottom"
+		},
+		collapsible: false,
+		event: "click",
+		heightStyle: "content",
+		hide: null,
+		show: null,
+
+		// callbacks
+		activate: null,
+		beforeActivate: null,
+		beforeLoad: null,
+		load: null
+	},
+
+	_isLocal: ( function() {
+		var rhash = /#.*$/;
+
+		return function( anchor ) {
+			var anchorUrl, locationUrl;
+
+			anchorUrl = anchor.href.replace( rhash, "" );
+			locationUrl = location.href.replace( rhash, "" );
+
+			// decoding may throw an error if the URL isn't UTF-8 (#9518)
+			try {
+				anchorUrl = decodeURIComponent( anchorUrl );
+			} catch ( error ) {}
+			try {
+				locationUrl = decodeURIComponent( locationUrl );
+			} catch ( error ) {}
+
+			return anchor.hash.length > 1 && anchorUrl === locationUrl;
+		};
+	} )(),
+
+	_create: function() {
+		var that = this,
+			options = this.options;
+
+		this.running = false;
+
+		this._addClass( "ui-tabs", "ui-widget ui-widget-content" );
+		this._toggleClass( "ui-tabs-collapsible", null, options.collapsible );
+
+		this._processTabs();
+		options.active = this._initialActive();
+
+		// Take disabling tabs via class attribute from HTML
+		// into account and update option properly.
+		if ( $.isArray( options.disabled ) ) {
+			options.disabled = $.unique( options.disabled.concat(
+				$.map( this.tabs.filter( ".ui-state-disabled" ), function( li ) {
+					return that.tabs.index( li );
+				} )
+			) ).sort();
+		}
+
+		// check for length avoids error when initializing empty list
+		if ( this.options.active !== false && this.anchors.length ) {
+			this.active = this._findActive( options.active );
+		} else {
+			this.active = $();
+		}
+
+		this._refresh();
+
+		if ( this.active.length ) {
+			this.load( options.active );
+		}
+	},
+
+	_initialActive: function() {
+		var active = this.options.active,
+			collapsible = this.options.collapsible,
+			locationHash = location.hash.substring( 1 );
+
+		if ( active === null ) {
+			// check the fragment identifier in the URL
+			if ( locationHash ) {
+				this.tabs.each( function( i, tab ) {
+					if ( $( tab ).attr( "aria-controls" ) === locationHash ) {
+						active = i;
+						return false;
+					}
+				} );
+			}
+
+			// check for a tab marked active via a class
+			if ( active === null ) {
+				active = this.tabs.index( this.tabs.filter( ".ui-tabs-active" ) );
+			}
+
+			// no active tab, set to false
+			if ( active === null || active === -1 ) {
+				active = this.tabs.length ? 0 : false;
+			}
+		}
+
+		// handle numbers: negative, out of range
+		if ( active !== false ) {
+			active = this.tabs.index( this.tabs.eq( active ) );
+			if ( active === -1 ) {
+				active = collapsible ? false : 0;
+			}
+		}
+
+		// don't allow collapsible: false and active: false
+		if ( !collapsible && active === false && this.anchors.length ) {
+			active = 0;
+		}
+
+		return active;
+	},
+
+	_getCreateEventData: function() {
+		return {
+			tab: this.active,
+			panel: !this.active.length ? $() : this._getPanelForTab( this.active )
+		};
+	},
+
+	_tabKeydown: function( event ) {
+		var focusedTab = $( $.ui.safeActiveElement( this.document[ 0 ] ) ).closest( "li" ),
+			selectedIndex = this.tabs.index( focusedTab ),
+			goingForward = true;
+
+		if ( this._handlePageNav( event ) ) {
+			return;
+		}
+
+		switch ( event.keyCode ) {
+		case $.ui.keyCode.RIGHT:
+		case $.ui.keyCode.DOWN:
+			selectedIndex++;
+			break;
+		case $.ui.keyCode.UP:
+		case $.ui.keyCode.LEFT:
+			goingForward = false;
+			selectedIndex--;
+			break;
+		case $.ui.keyCode.END:
+			selectedIndex = this.anchors.length - 1;
+			break;
+		case $.ui.keyCode.HOME:
+			selectedIndex = 0;
+			break;
+		case $.ui.keyCode.SPACE:
+			// Activate only, no collapsing
+			event.preventDefault();
+			clearTimeout( this.activating );
+			this._activate( selectedIndex );
+			return;
+		case $.ui.keyCode.ENTER:
+			// Toggle (cancel delayed activation, allow collapsing)
+			event.preventDefault();
+			clearTimeout( this.activating );
+			// Determine if we should collapse or activate
+			this._activate( selectedIndex === this.options.active ? false : selectedIndex );
+			return;
+		default:
+			return;
+		}
+
+		// Focus the appropriate tab, based on which key was pressed
+		event.preventDefault();
+		clearTimeout( this.activating );
+		selectedIndex = this._focusNextTab( selectedIndex, goingForward );
+
+		// Navigating with control/command key will prevent automatic activation
+		if ( !event.ctrlKey && !event.metaKey ) {
+
+			// Update aria-selected immediately so that AT think the tab is already selected.
+			// Otherwise AT may confuse the user by stating that they need to activate the tab,
+			// but the tab will already be activated by the time the announcement finishes.
+			focusedTab.attr( "aria-selected", "false" );
+			this.tabs.eq( selectedIndex ).attr( "aria-selected", "true" );
+
+			this.activating = this._delay( function() {
+				this.option( "active", selectedIndex );
+			}, this.delay );
+		}
+	},
+
+	_panelKeydown: function( event ) {
+		if ( this._handlePageNav( event ) ) {
+			return;
+		}
+
+		// Ctrl+up moves focus to the current tab
+		if ( event.ctrlKey && event.keyCode === $.ui.keyCode.UP ) {
+			event.preventDefault();
+			this.active.trigger( "focus" );
+		}
+	},
+
+	// Alt+page up/down moves focus to the previous/next tab (and activates)
+	_handlePageNav: function( event ) {
+		if ( event.altKey && event.keyCode === $.ui.keyCode.PAGE_UP ) {
+			this._activate( this._focusNextTab( this.options.active - 1, false ) );
+			return true;
+		}
+		if ( event.altKey && event.keyCode === $.ui.keyCode.PAGE_DOWN ) {
+			this._activate( this._focusNextTab( this.options.active + 1, true ) );
+			return true;
+		}
+	},
+
+	_findNextTab: function( index, goingForward ) {
+		var lastTabIndex = this.tabs.length - 1;
+
+		function constrain() {
+			if ( index > lastTabIndex ) {
+				index = 0;
+			}
+			if ( index < 0 ) {
+				index = lastTabIndex;
+			}
+			return index;
+		}
+
+		while ( $.inArray( constrain(), this.options.disabled ) !== -1 ) {
+			index = goingForward ? index + 1 : index - 1;
+		}
+
+		return index;
+	},
+
+	_focusNextTab: function( index, goingForward ) {
+		index = this._findNextTab( index, goingForward );
+		this.tabs.eq( index ).trigger( "focus" );
+		return index;
+	},
+
+	_setOption: function( key, value ) {
+		if ( key === "active" ) {
+			// _activate() will handle invalid values and update this.options
+			this._activate( value );
+			return;
+		}
+
+		if ( key === "disabled" ) {
+			// don't use the widget factory's disabled handling
+			this._setupDisabled( value );
+			return;
+		}
+
+		this._super( key, value );
+
+		if ( key === "collapsible" ) {
+			this._toggleClass( "ui-tabs-collapsible", null, value );
+
+			// Setting collapsible: false while collapsed; open first panel
+			if ( !value && this.options.active === false ) {
+				this._activate( 0 );
+			}
+		}
+
+		if ( key === "event" ) {
+			this._setupEvents( value );
+		}
+
+		if ( key === "heightStyle" ) {
+			this._setupHeightStyle( value );
+		}
+	},
+
+	_sanitizeSelector: function( hash ) {
+		return hash ? hash.replace( /[!"$%&'()*+,.\/:;<=>?@\[\]\^`{|}~]/g, "\\$&" ) : "";
+	},
+
+	refresh: function() {
+		var options = this.options,
+			lis = this.tablist.children( ":has(a[href])" );
+
+		// get disabled tabs from class attribute from HTML
+		// this will get converted to a boolean if needed in _refresh()
+		options.disabled = $.map( lis.filter( ".ui-state-disabled" ), function( tab ) {
+			return lis.index( tab );
+		} );
+
+		this._processTabs();
+
+		// was collapsed or no tabs
+		if ( options.active === false || !this.anchors.length ) {
+			options.active = false;
+			this.active = $();
+		// was active, but active tab is gone
+		} else if ( this.active.length && !$.contains( this.tablist[ 0 ], this.active[ 0 ] ) ) {
+			// all remaining tabs are disabled
+			if ( this.tabs.length === options.disabled.length ) {
+				options.active = false;
+				this.active = $();
+			// activate previous tab
+			} else {
+				this._activate( this._findNextTab( Math.max( 0, options.active - 1 ), false ) );
+			}
+		// was active, active tab still exists
+		} else {
+			// make sure active index is correct
+			options.active = this.tabs.index( this.active );
+		}
+
+		this._refresh();
+	},
+
+	_refresh: function() {
+		this._setupDisabled( this.options.disabled );
+		this._setupEvents( this.options.event );
+		this._setupHeightStyle( this.options.heightStyle );
+
+		this.tabs.not( this.active ).attr( {
+			"aria-selected": "false",
+			"aria-expanded": "false",
+			tabIndex: -1
+		} );
+		this.panels.not( this._getPanelForTab( this.active ) )
+			.hide()
+			.attr( {
+				"aria-hidden": "true"
+			} );
+
+		// Make sure one tab is in the tab order
+		if ( !this.active.length ) {
+			this.tabs.eq( 0 ).attr( "tabIndex", 0 );
+		} else {
+			this.active
+				.attr( {
+					"aria-selected": "true",
+					"aria-expanded": "true",
+					tabIndex: 0
+				} );
+			this._addClass( this.active, "ui-tabs-active", "ui-state-active" );
+			this._getPanelForTab( this.active )
+				.show()
+				.attr( {
+					"aria-hidden": "false"
+				} );
+		}
+	},
+
+	_processTabs: function() {
+		var that = this,
+			prevTabs = this.tabs,
+			prevAnchors = this.anchors,
+			prevPanels = this.panels;
+
+		this.tablist = this._getList().attr( "role", "tablist" );
+		this._addClass( this.tablist, "ui-tabs-nav",
+			"ui-helper-reset ui-helper-clearfix ui-widget-header" );
+
+		// Prevent users from focusing disabled tabs via click
+		this.tablist
+			.on( "mousedown" + this.eventNamespace, "> li", function( event ) {
+				if ( $( this ).is( ".ui-state-disabled" ) ) {
+					event.preventDefault();
+				}
+			} )
+
+			// support: IE <9
+			// Preventing the default action in mousedown doesn't prevent IE
+			// from focusing the element, so if the anchor gets focused, blur.
+			// We don't have to worry about focusing the previously focused
+			// element since clicking on a non-focusable element should focus
+			// the body anyway.
+			.on( "focus" + this.eventNamespace, ".ui-tabs-anchor", function() {
+				if ( $( this ).closest( "li" ).is( ".ui-state-disabled" ) ) {
+					this.blur();
+				}
+			} );
+
+		this.tabs = this.tablist.find( "> li:has(a[href])" )
+			.attr( {
+				role: "tab",
+				tabIndex: -1
+			} );
+		this._addClass( this.tabs, "ui-tabs-tab", "ui-state-default" );
+
+		this.anchors = this.tabs.map( function() {
+			return $( "a", this )[ 0 ];
+		} )
+			.attr( {
+				role: "presentation",
+				tabIndex: -1
+			} );
+		this._addClass( this.anchors, "ui-tabs-anchor" );
+
+		this.panels = $();
+
+		this.anchors.each( function( i, anchor ) {
+			var selector, panel, panelId,
+				anchorId = $( anchor ).uniqueId().attr( "id" ),
+				tab = $( anchor ).closest( "li" ),
+				originalAriaControls = tab.attr( "aria-controls" );
+
+			// inline tab
+			if ( that._isLocal( anchor ) ) {
+				selector = anchor.hash;
+				panelId = selector.substring( 1 );
+				panel = that.element.find( that._sanitizeSelector( selector ) );
+			// remote tab
+			} else {
+				// If the tab doesn't already have aria-controls,
+				// generate an id by using a throw-away element
+				panelId = tab.attr( "aria-controls" ) || $( {} ).uniqueId()[ 0 ].id;
+				selector = "#" + panelId;
+				panel = that.element.find( selector );
+				if ( !panel.length ) {
+					panel = that._createPanel( panelId );
+					panel.insertAfter( that.panels[ i - 1 ] || that.tablist );
+				}
+				panel.attr( "aria-live", "polite" );
+			}
+
+			if ( panel.length ) {
+				that.panels = that.panels.add( panel );
+			}
+			if ( originalAriaControls ) {
+				tab.data( "ui-tabs-aria-controls", originalAriaControls );
+			}
+			tab.attr( {
+				"aria-controls": panelId,
+				"aria-labelledby": anchorId
+			} );
+			panel.attr( "aria-labelledby", anchorId );
+		} );
+
+		this.panels.attr( "role", "tabpanel" );
+		this._addClass( this.panels, "ui-tabs-panel", "ui-widget-content" );
+
+		// Avoid memory leaks (#10056)
+		if ( prevTabs ) {
+			this._off( prevTabs.not( this.tabs ) );
+			this._off( prevAnchors.not( this.anchors ) );
+			this._off( prevPanels.not( this.panels ) );
+		}
+	},
+
+	// allow overriding how to find the list for rare usage scenarios (#7715)
+	_getList: function() {
+		return this.tablist || this.element.find( "ol, ul" ).eq( 0 );
+	},
+
+	_createPanel: function( id ) {
+		return $( "<div>" )
+			.attr( "id", id )
+			.data( "ui-tabs-destroy", true );
+	},
+
+	_setupDisabled: function( disabled ) {
+		var currentItem, li, i;
+
+		if ( $.isArray( disabled ) ) {
+			if ( !disabled.length ) {
+				disabled = false;
+			} else if ( disabled.length === this.anchors.length ) {
+				disabled = true;
+			}
+		}
+
+		// disable tabs
+		for ( i = 0; ( li = this.tabs[ i ] ); i++ ) {
+			currentItem = $( li );
+			if ( disabled === true || $.inArray( i, disabled ) !== -1 ) {
+				currentItem.attr( "aria-disabled", "true" );
+				this._addClass( currentItem, null, "ui-state-disabled" );
+			} else {
+				currentItem.removeAttr( "aria-disabled" );
+				this._removeClass( currentItem, null, "ui-state-disabled" );
+			}
+		}
+
+		this.options.disabled = disabled;
+	},
+
+	_setupEvents: function( event ) {
+		var events = {};
+		if ( event ) {
+			$.each( event.split( " " ), function( index, eventName ) {
+				events[ eventName ] = "_eventHandler";
+			} );
+		}
+
+		this._off( this.anchors.add( this.tabs ).add( this.panels ) );
+		// Always prevent the default action, even when disabled
+		this._on( true, this.anchors, {
+			click: function( event ) {
+				event.preventDefault();
+			}
+		} );
+		this._on( this.anchors, events );
+		this._on( this.tabs, { keydown: "_tabKeydown" } );
+		this._on( this.panels, { keydown: "_panelKeydown" } );
+
+		this._focusable( this.tabs );
+		this._hoverable( this.tabs );
+	},
+
+	_setupHeightStyle: function( heightStyle ) {
+		var maxHeight,
+			parent = this.element.parent();
+
+		if ( heightStyle === "fill" ) {
+			maxHeight = parent.height();
+			maxHeight -= this.element.outerHeight() - this.element.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.element.children().not( this.panels ).each( function() {
+				maxHeight -= $( this ).outerHeight( true );
+			} );
+
+			this.panels.each( function() {
+				$( this ).height( Math.max( 0, maxHeight -
+					$( this ).innerHeight() + $( this ).height() ) );
+			} )
+				.css( "overflow", "auto" );
+		} else if ( heightStyle === "auto" ) {
+			maxHeight = 0;
+			this.panels.each( function() {
+				maxHeight = Math.max( maxHeight, $( this ).height( "" ).height() );
+			} ).height( maxHeight );
+		}
+	},
+
+	_eventHandler: function( event ) {
+		var options = this.options,
+			active = this.active,
+			anchor = $( event.currentTarget ),
+			tab = anchor.closest( "li" ),
+			clickedIsActive = tab[ 0 ] === active[ 0 ],
+			collapsing = clickedIsActive && options.collapsible,
+			toShow = collapsing ? $() : this._getPanelForTab( tab ),
+			toHide = !active.length ? $() : this._getPanelForTab( active ),
+			eventData = {
+				oldTab: active,
+				oldPanel: toHide,
+				newTab: collapsing ? $() : tab,
+				newPanel: toShow
+			};
+
+		event.preventDefault();
+
+		if ( tab.hasClass( "ui-state-disabled" ) ||
+				// tab is already loading
+				tab.hasClass( "ui-tabs-loading" ) ||
+				// can't switch durning an animation
+				this.running ||
+				// 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.tabs.index( tab );
+
+		this.active = clickedIsActive ? $() : tab;
+		if ( this.xhr ) {
+			this.xhr.abort();
+		}
+
+		if ( !toHide.length && !toShow.length ) {
+			$.error( "jQuery UI Tabs: Mismatching fragment identifier." );
+		}
+
+		if ( toShow.length ) {
+			this.load( this.tabs.index( tab ), event );
+		}
+		this._toggle( event, eventData );
+	},
+
+	// handles show/hide for selecting tabs
+	_toggle: function( event, eventData ) {
+		var that = this,
+			toShow = eventData.newPanel,
+			toHide = eventData.oldPanel;
+
+		this.running = true;
+
+		function complete() {
+			that.running = false;
+			that._trigger( "activate", event, eventData );
+		}
+
+		function show() {
+			that._addClass( eventData.newTab.closest( "li" ), "ui-tabs-active", "ui-state-active" );
+
+			if ( toShow.length && that.options.show ) {
+				that._show( toShow, that.options.show, complete );
+			} else {
+				toShow.show();
+				complete();
+			}
+		}
+
+		// start out by hiding, then showing, then completing
+		if ( toHide.length && this.options.hide ) {
+			this._hide( toHide, this.options.hide, function() {
+				that._removeClass( eventData.oldTab.closest( "li" ),
+					"ui-tabs-active", "ui-state-active" );
+				show();
+			} );
+		} else {
+			this._removeClass( eventData.oldTab.closest( "li" ),
+				"ui-tabs-active", "ui-state-active" );
+			toHide.hide();
+			show();
+		}
+
+		toHide.attr( "aria-hidden", "true" );
+		eventData.oldTab.attr( {
+			"aria-selected": "false",
+			"aria-expanded": "false"
+		} );
+		// If we're switching tabs, remove the old tab from the tab order.
+		// If we're opening from collapsed state, remove the previous tab from the tab order.
+		// If we're collapsing, then keep the collapsing tab in the tab order.
+		if ( toShow.length && toHide.length ) {
+			eventData.oldTab.attr( "tabIndex", -1 );
+		} else if ( toShow.length ) {
+			this.tabs.filter( function() {
+				return $( this ).attr( "tabIndex" ) === 0;
+			} )
+				.attr( "tabIndex", -1 );
+		}
+
+		toShow.attr( "aria-hidden", "false" );
+		eventData.newTab.attr( {
+			"aria-selected": "true",
+			"aria-expanded": "true",
+			tabIndex: 0
+		} );
+	},
+
+	_activate: function( index ) {
+		var anchor,
+			active = this._findActive( index );
+
+		// trying to activate the already active panel
+		if ( active[ 0 ] === this.active[ 0 ] ) {
+			return;
+		}
+
+		// trying to collapse, simulate a click on the current active header
+		if ( !active.length ) {
+			active = this.active;
+		}
+
+		anchor = active.find( ".ui-tabs-anchor" )[ 0 ];
+		this._eventHandler( {
+			target: anchor,
+			currentTarget: anchor,
+			preventDefault: $.noop
+		} );
+	},
+
+	_findActive: function( index ) {
+		return index === false ? $() : this.tabs.eq( index );
+	},
+
+	_getIndex: function( index ) {
+		// meta-function to give users option to provide a href string instead of a numerical index.
+		if ( typeof index === "string" ) {
+			index = this.anchors.index( this.anchors.filter( "[href$='" + $.ui.escapeSelector( index ) + "']" ) );
+		}
+
+		return index;
+	},
+
+	_destroy: function() {
+		if ( this.xhr ) {
+			this.xhr.abort();
+		}
+
+		this.tablist
+			.removeAttr( "role" )
+			.off( this.eventNamespace );
+
+		this.anchors
+			.removeAttr( "role tabIndex" )
+			.removeUniqueId();
+
+		this.tabs.add( this.panels ).each( function() {
+			if ( $.data( this, "ui-tabs-destroy" ) ) {
+				$( this ).remove();
+			} else {
+				$( this ).removeAttr( "role tabIndex " +
+					"aria-live aria-busy aria-selected aria-labelledby aria-hidden aria-expanded" );
+			}
+		} );
+
+		this.tabs.each( function() {
+			var li = $( this ),
+				prev = li.data( "ui-tabs-aria-controls" );
+			if ( prev ) {
+				li
+					.attr( "aria-controls", prev )
+					.removeData( "ui-tabs-aria-controls" );
+			} else {
+				li.removeAttr( "aria-controls" );
+			}
+		} );
+
+		this.panels.show();
+
+		if ( this.options.heightStyle !== "content" ) {
+			this.panels.css( "height", "" );
+		}
+	},
+
+	enable: function( index ) {
+		var disabled = this.options.disabled;
+		if ( disabled === false ) {
+			return;
+		}
+
+		if ( index === undefined ) {
+			disabled = false;
+		} else {
+			index = this._getIndex( index );
+			if ( $.isArray( disabled ) ) {
+				disabled = $.map( disabled, function( num ) {
+					return num !== index ? num : null;
+				} );
+			} else {
+				disabled = $.map( this.tabs, function( li, num ) {
+					return num !== index ? num : null;
+				} );
+			}
+		}
+		this._setupDisabled( disabled );
+	},
+
+	disable: function( index ) {
+		var disabled = this.options.disabled;
+		if ( disabled === true ) {
+			return;
+		}
+
+		if ( index === undefined ) {
+			disabled = true;
+		} else {
+			index = this._getIndex( index );
+			if ( $.inArray( index, disabled ) !== -1 ) {
+				return;
+			}
+			if ( $.isArray( disabled ) ) {
+				disabled = $.merge( [ index ], disabled ).sort();
+			} else {
+				disabled = [ index ];
+			}
+		}
+		this._setupDisabled( disabled );
+	},
+
+	load: function( index, event ) {
+		index = this._getIndex( index );
+		var that = this,
+			tab = this.tabs.eq( index ),
+			anchor = tab.find( ".ui-tabs-anchor" ),
+			panel = this._getPanelForTab( tab ),
+			eventData = {
+				tab: tab,
+				panel: panel
+			},
+			complete = function( jqXHR, status ) {
+				if ( status === "abort" ) {
+					that.panels.stop( false, true );
+				}
+
+				that._removeClass( tab, "ui-tabs-loading" );
+				panel.removeAttr( "aria-busy" );
+
+				if ( jqXHR === that.xhr ) {
+					delete that.xhr;
+				}
+			};
+
+		// not remote
+		if ( this._isLocal( anchor[ 0 ] ) ) {
+			return;
+		}
+
+		this.xhr = $.ajax( this._ajaxSettings( anchor, event, eventData ) );
+
+		// support: jQuery <1.8
+		// jQuery <1.8 returns false if the request is canceled in beforeSend,
+		// but as of 1.8, $.ajax() always returns a jqXHR object.
+		if ( this.xhr && this.xhr.statusText !== "canceled" ) {
+			this._addClass( tab, "ui-tabs-loading" );
+			panel.attr( "aria-busy", "true" );
+
+			this.xhr
+				.done( function( response, status, jqXHR ) {
+					// support: jQuery <1.8
+					// http://bugs.jquery.com/ticket/11778
+					setTimeout( function() {
+						panel.html( response );
+						that._trigger( "load", event, eventData );
+
+						complete( jqXHR, status );
+					}, 1 );
+				} )
+				.fail( function( jqXHR, status ) {
+					// support: jQuery <1.8
+					// http://bugs.jquery.com/ticket/11778
+					setTimeout( function() {
+						complete( jqXHR, status );
+					}, 1 );
+				} );
+		}
+	},
+
+	_ajaxSettings: function( anchor, event, eventData ) {
+		var that = this;
+		return {
+			url: anchor.attr( "href" ),
+			beforeSend: function( jqXHR, settings ) {
+				return that._trigger( "beforeLoad", event,
+					$.extend( { jqXHR: jqXHR, ajaxSettings: settings }, eventData ) );
+			}
+		};
+	},
+
+	_getPanelForTab: function( tab ) {
+		var id = $( tab ).attr( "aria-controls" );
+		return this.element.find( this._sanitizeSelector( "#" + id ) );
+	}
+} );
+
+// DEPRECATED
+// TODO: Switch return back to widget declaration at top of file when this is removed
+if ( $.uiBackCompat !== false ) {
+
+	// Backcompat for ui-tab class (now ui-tabs-tab)
+	$.widget( "ui.tabs", $.ui.tabs, {
+		_processTabs: function() {
+			this._superApply( arguments );
+			this._addClass( this.tabs, "ui-tab" );
+		}
+	} );
+}
+
+return $.ui.tabs;
+
+} ) );