Dialog: Safe activeElement access.

tjvantoll · tjvantoll · commit 2dfe85d3e226 · 2013-10-01T09:22:07.000+03:00
Fixed #9420 - Dialog: Close causes blur of window in IE9
Fixed #8443 - Dialog: "unspecified error" when using ie9 and iframe
diff --git a/ui/jquery.ui.dialog.js b/ui/jquery.ui.dialog.js
@@ -169,7 +169,8 @@ $.widget( "ui.dialog", {
 	enable: $.noop,
 
 	close: function( event ) {
-		var that = this;
+		var activeElement,
+			that = this;
 
 		if ( !this._isOpen || this._trigger( "beforeClose", event ) === false ) {
 			return;
@@ -179,10 +180,22 @@ $.widget( "ui.dialog", {
 		this._destroyOverlay();
 
 		if ( !this.opener.filter(":focusable").focus().length ) {
-			// Hiding a focused element doesn't trigger blur in WebKit
-			// so in case we have nothing to focus on, explicitly blur the active element
-			// https://bugs.webkit.org/show_bug.cgi?id=47182
-			$( this.document[0].activeElement ).blur();
+
+			// support: IE9
+			// IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
+			try {
+				activeElement = this.document[ 0 ].activeElement;
+
+				// Support: IE9, IE10
+				// If the <body> is blurred, IE will switch windows, see #4520
+				if ( activeElement && activeElement.nodeName.toLowerCase() !== "body" ) {
+
+					// Hiding a focused element doesn't trigger blur in WebKit
+					// so in case we have nothing to focus on, explicitly blur the active element
+					// https://bugs.webkit.org/show_bug.cgi?id=47182
+					$( activeElement ).blur();
+				}
+			} catch ( error ) {}
 		}
 
 		this._hide( this.uiDialog, this.options.hide, function() {
