Dialog: Fixed #3087: Added beforeclose callback for dialogs (can prevent closing the dialog by returning false).

tests/dialog.js

@@ -622,6 +622,30 @@ test("close", function() {
 	el.remove();
 });
 
+test("beforeclose", function() {
+	expect(6);
+	
+	el = $('<div/>').dialog({
+		beforeclose: function(ev, ui) {
+			ok(true, '.dialog("close") fires beforeclose callback');
+			equals(this, el[0], "context of callback");
+			return false;
+		}
+	});
+	el.dialog('close');
+	isOpen('beforeclose callback should prevent dialog from closing');
+	el.remove();
+	
+	el = $('<div/>').dialog().bind('dialogbeforeclose', function(ev, ui) {
+		ok(true, '.dialog("close") triggers dialogbeforeclose event');
+		equals(this, el[0], "context of event");
+		return false;
+	});
+	el.dialog('close');
+	isOpen('dialogbeforeclose event should prevent dialog from closing');
+	el.remove();
+});
+
 module("dialog: Tickets");
 
 })(jQuery);

ui/ui.dialog.js

@@ -135,6 +135,10 @@ $.widget("ui.dialog", {
 	},
 	
 	close: function() {
+		if (false === this._trigger('beforeclose', null, { options: this.options })) {
+			return;
+		}
+		
 		(this.overlay && this.overlay.destroy());
 		this.uiDialog
 			.hide(this.options.hide)