Rewrite of globalEval. Uses window.execScript or window.eval with a trick to...

Rewrite of globalEval. Uses window.execScript or window.eval with a trick to ensure proper context. Unit tests added.

src/core.js

@@ -561,24 +561,17 @@ jQuery.extend({
 
 	noop: function() {},
 
-	// Evalulates a script in a global context
+	// Evaluates a script in a global context
+	// Workarounds based on findings by Jim Driscoll
+	// http://weblogs.java.net/blog/driscoll/archive/2009/09/08/eval-javascript-global-context
 	globalEval: function( data ) {
-		if ( data && rnotwhite.test(data) ) {
-			// Inspired by code by Andrea Giammarchi
-			// http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
-			var head = document.head || document.getElementsByTagName( "head" )[0] || document.documentElement,
-				script = document.createElement( "script" );
-
-			if ( jQuery.support.scriptEval() ) {
-				script.appendChild( document.createTextNode( data ) );
-			} else {
-				script.text = data;
-			}
-
-			// Use insertBefore instead of appendChild to circumvent an IE6 bug.
-			// This arises when a base node is used (#2709).
-			head.insertBefore( script, head.firstChild );
-			head.removeChild( script );
+		if ( data && rnotwhite.test( data ) ) {
+			// We use execScript on Internet Explorer
+			// We use an anonymous function so that context is window
+			// rather than jQuery in Firefox
+			( window.execScript || function( data ) {
+				window[ "eval" ].call( window, data );
+			} )( data );
 		}
 	},
 

test/unit/core.js

@@ -172,6 +172,26 @@ test("selector state", function() {
 	);
 });
 
+test( "globalEval", function() {
+
+	expect( 3 );
+
+	jQuery.globalEval( "var globalEvalTest = true;" );
+	ok( window.globalEvalTest, "Test variable declarations are global" );
+
+	window.globalEvalTest = false;
+
+	jQuery.globalEval( "globalEvalTest = true;" );
+	ok( window.globalEvalTest, "Test variable assignments are global" );
+
+	window.globalEvalTest = false;
+
+	jQuery.globalEval( "this.globalEvalTest = true;" );
+	ok( window.globalEvalTest, "Test context (this) is the window object" );
+
+	window.globalEvalTest = undefined;
+});
+
 if ( !isLocal ) {
 test("browser", function() {
 	stop();