Accordion: Enhance refresh to allow adding/removing panels. Fixes #4672 - Accordion: ability to add/remove panels

1 files changed, 126 insertions, 87 deletions

diff --git a/ui/jquery.ui.accordion.js b/ui/jquery.ui.accordion.js
index 17ce155a8..4ebc5b549 100644
--- a/ui/jquery.ui.accordion.js
+++ b/ui/jquery.ui.accordion.js
@@ -43,95 +43,23 @@ $.widget( "ui.accordion", {
 	},
 
 	_create: function() {
-		var accordionId = this.accordionId = "ui-accordion-" +
-				(this.element.attr( "id" ) || ++uid),
-			options = this.options;
-
+		var options = this.options;
 		this.prevShow = this.prevHide = $();
-		this.element.addClass( "ui-accordion ui-widget ui-helper-reset" );
-
-		this.headers = this.element.find( options.header )
-			.addClass( "ui-accordion-header ui-helper-reset ui-state-default ui-corner-all" );
-		this._hoverable( this.headers );
-		this._focusable( this.headers );
-
-		this.headers.next()
-			.addClass( "ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom" )
-			.hide();
+		this.element.addClass( "ui-accordion ui-widget ui-helper-reset" )
+			// ARIA
+			.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.active = this._findActive( options.active )
-			.addClass( "ui-accordion-header-active ui-state-active" )
-			.toggleClass( "ui-corner-all ui-corner-top" );
-		this.active.next()
-			.addClass( "ui-accordion-content-active" )
-			.show();
-
-		this._createIcons();
-		this.refresh();
-
-		// ARIA
-		this.element.attr( "role", "tablist" );
-
-		this.headers
-			.attr( "role", "tab" )
-			.each(function( i ) {
-				var header = $( this ),
-					headerId = header.attr( "id" ),
-					panel = header.next(),
-					panelId = panel.attr( "id" );
-				if ( !headerId ) {
-					headerId = accordionId + "-header-" + i;
-					header.attr( "id", headerId );
-				}
-				if ( !panelId ) {
-					panelId = accordionId + "-panel-" + i;
-					panel.attr( "id", panelId );
-				}
-				header.attr( "aria-controls", panelId );
-				panel.attr( "aria-labelledby", headerId );
-			})
-			.next()
-				.attr( "role", "tabpanel" );
-
-		this.headers
-			.not( this.active )
-			.attr({
-				"aria-selected": "false",
-				tabIndex: -1
-			})
-			.next()
-				.attr({
-					"aria-expanded": "false",
-					"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",
-				tabIndex: 0
-			})
-			.next()
-				.attr({
-					"aria-expanded": "true",
-					"aria-hidden": "false"
-				});
-		}
-
-		this._on( this.headers, { keydown: "_keydown" });
-		this._on( this.headers.next(), { keydown: "_panelKeyDown" });
-		this._setupEvents( options.event );
+		this._refresh();
 	},
 
 	_getCreateEventData: function() {
@@ -283,9 +211,114 @@ $.widget( "ui.accordion", {
 	},
 
 	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 = $();
+		// active false only when collapsible is true
+		} if ( options.active === false ) {
+			this._activate( 0 );
+		// was active, but active panel is gone
+		} else if ( this.active.length && !$.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() {
+		this.headers = this.element.find( this.options.header )
+			.addClass( "ui-accordion-header ui-helper-reset ui-state-default ui-corner-all" );
+
+		this.headers.next()
+			.addClass( "ui-accordion-content ui-helper-reset ui-widget-content ui-corner-bottom" )
+			.filter(":not(.ui-accordion-content-active)")
+			.hide();
+	},
+
+	_refresh: function() {
 		var maxHeight,
-			heightStyle = this.options.heightStyle,
-			parent = this.element.parent();
+			options = this.options,
+			heightStyle = options.heightStyle,
+			parent = this.element.parent(),
+			accordionId = this.accordionId = "ui-accordion-" +
+				(this.element.attr( "id" ) || ++uid);
+
+		this.active = this._findActive( options.active )
+			.addClass( "ui-accordion-header-active ui-state-active" )
+			.toggleClass( "ui-corner-all ui-corner-top" );
+		this.active.next()
+			.addClass( "ui-accordion-content-active" )
+			.show();
+
+		this.headers
+			.attr( "role", "tab" )
+			.each(function( i ) {
+				var header = $( this ),
+					headerId = header.attr( "id" ),
+					panel = header.next(),
+					panelId = panel.attr( "id" );
+				if ( !headerId ) {
+					headerId = accordionId + "-header-" + i;
+					header.attr( "id", headerId );
+				}
+				if ( !panelId ) {
+					panelId = accordionId + "-panel-" + i;
+					panel.attr( "id", panelId );
+				}
+				header.attr( "aria-controls", panelId );
+				panel.attr( "aria-labelledby", headerId );
+			})
+			.next()
+				.attr( "role", "tabpanel" );
+
+		this.headers
+			.not( this.active )
+			.attr({
+				"aria-selected": "false",
+				tabIndex: -1
+			})
+			.next()
+				.attr({
+					"aria-expanded": "false",
+					"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",
+				tabIndex: 0
+			})
+			.next()
+				.attr({
+					"aria-expanded": "true",
+					"aria-hidden": "false"
+				});
+		}
+
+		this._createIcons();
+
+		this._setupEvents( options.event );
 
 		if ( heightStyle === "fill" ) {
 			maxHeight = parent.height();
@@ -342,14 +375,20 @@ $.widget( "ui.accordion", {
 	},
 
 	_setupEvents: function( event ) {
-		var events = {};
-		if ( !event ) {
-			return;
+		var events = {
+			keydown: "_keydown"
+		};
+		if ( event ) {
+			$.each( event.split(" "), function( index, eventName ) {
+				events[ eventName ] = "_eventHandler";
+			});
 		}
-		$.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 ) {