Dialog: Keep track of instances to focus when elements outside the dialog get focus. Works with inheritance. Adds tests for both. Fixes #9241 - Dialog: UI dialog inheritance causes undefined property '_focusTabbable' in IE9

tests/unit/dialog/dialog_core.js

@@ -4,6 +4,7 @@
 
 (function($) {
 
+// TODO add teardown callback to remove dialogs
 module("dialog: core");
 
 test("title id", function() {
@@ -180,4 +181,51 @@ asyncTest( "#9048: multiple modal dialogs opened and closed in different order",
 		start();
 	});
 });
+
+asyncTest( "interaction between overlay and other dialogs", function() {
+	$.widget( "ui.testWidget", $.ui.dialog, {
+		options: {
+			modal: true,
+			autoOpen: false
+		}
+	});
+	expect( 2 );
+	var first = $( "<div><input id='input-1'></div>" ).dialog({
+			modal: true
+		}),
+		firstInput = first.find( "input" ),
+		second = $( "<div><input id='input-2'></div>" ).testWidget(),
+		secondInput = second.find( "input" );
+
+	// Support: IE8
+	// For some reason the focus doesn't get set properly if we don't
+	// focus the body first.
+	$( "body" ).focus();
+
+	// Wait for the modal to init
+	setTimeout(function() {
+		second.testWidget( "open" );
+
+		// Simulate user tabbing from address bar to an element outside the dialog
+		$( "#favorite-animal" ).focus();
+		setTimeout(function() {
+			equal( document.activeElement, secondInput[ 0 ] );
+
+			// Last active dialog must receive focus
+			firstInput.focus();
+			$( "#favorite-animal" ).focus();
+			setTimeout(function() {
+				equal( document.activeElement, firstInput[ 0 ] );
+
+				// Cleanup
+				first.remove();
+				second.remove();
+				delete $.ui.testWidget;
+				delete $.fn.testWidget;
+				start();
+			});
+		});
+	});
+});
+
 })(jQuery);

ui/jquery.ui.dialog.js

@@ -182,6 +182,7 @@ $.widget( "ui.dialog", {
 		this._isOpen = false;
 		this._focusedElement = null;
 		this._destroyOverlay();
+		this._untrackInstance();
 
 		if ( !this.opener.filter( ":focusable" ).focus().length ) {
 
@@ -562,11 +563,30 @@ $.widget( "ui.dialog", {
 	_trackFocus: function() {
 		this._on( this.widget(), {
 			"focusin": function( event ) {
+				this._untrackInstance();
+				this._trackingInstances().unshift( this );
 				this._focusedElement = $( event.target );
 			}
 		});
 	},
 
+	_untrackInstance: function() {
+		var instances = this._trackingInstances(),
+			exists = $.inArray( this, instances );
+		if ( exists !== -1 ) {
+			instances.splice( exists, 1 );
+		}
+	},
+
+	_trackingInstances: function() {
+		var instances = this.document.data( "ui-dialog-instances" );
+		if ( !instances ) {
+			instances = [];
+			this.document.data( "ui-dialog-instances", instances );
+		}
+		return instances;
+	},
+
 	_minHeight: function() {
 		var options = this.options;
 
@@ -783,8 +803,7 @@ $.widget( "ui.dialog", {
 
 					if ( !this._allowInteraction( event ) ) {
 						event.preventDefault();
-						this.document.find( ".ui-dialog:visible:last .ui-dialog-content" )
-							.data( this.widgetFullName )._focusTabbable();
+						this._trackingInstances()[ 0 ]._focusTabbable();
 					}
 				}
 			});