Widget: Throw errors for invalid method calls. Fixes #5972 - Widget: …

…Throw error for non-existent method calls.

tests/unit/widget/widget_core.js

@@ -120,6 +120,23 @@ test( "direct usage", function() {
 	equals( instance.getterSetterVal, 30, "getter/setter can act as setter" );
 });
 
+test( "error handling", function() {
+	expect( 2 );
+	var error = $.error;
+	$.widget( "ui.testWidget", {} );
+	$.error = function( msg ) {
+		equal( msg, "cannot call methods on testWidget prior to initialization; " +
+			"attempted to call method 'missing'", "method call before init" );
+	};
+	$( "<div>" ).testWidget( "missing" );
+	$.error = function( msg ) {
+		equal( msg, "no such method 'missing' for testWidget widget instance",
+			"invalid method call on widget instance" );
+	};
+	$( "<div>" ).testWidget().testWidget( "missing" );
+	$.error = error;
+});
+
 test("merge multiple option arguments", function() {
 	expect( 1 );
 	$.widget( "ui.testWidget", {

ui/jquery.ui.widget.js

@@ -96,19 +96,15 @@ $.widget.bridge = function( name, object ) {
 
 		if ( isMethodCall ) {
 			this.each(function() {
-				var instance = $.data( this, name ),
-					methodValue = instance && $.isFunction( instance[options] ) ?
-						instance[ options ].apply( instance, args ) :
-						instance;
-				// TODO: add this back in 1.9 and use $.error() (see #5972)
-//				if ( !instance ) {
-//					throw "cannot call methods on " + name + " prior to initialization; " +
-//						"attempted to call method '" + options + "'";
-//				}
-//				if ( !$.isFunction( instance[options] ) ) {
-//					throw "no such method '" + options + "' for " + name + " widget instance";
-//				}
-//				var methodValue = instance[ options ].apply( instance, args );
+				var instance = $.data( this, name );
+				if ( !instance ) {
+					return $.error( "cannot call methods on " + name + " prior to initialization; " +
+						"attempted to call method '" + options + "'" );
+				}
+				if ( !$.isFunction( instance[options] ) ) {
+					return $.error( "no such method '" + options + "' for " + name + " widget instance" );
+				}
+				var methodValue = instance[ options ].apply( instance, args );
 				if ( methodValue !== instance && methodValue !== undefined ) {
 					returnValue = methodValue;
 					return false;