http://ayende.comAyende @ RahienCopyright (C) Ayende Rahien 2004 - 2021 (c) 202660@Stan: Neat trick! This is what I put into our little WebTestFramework here. It's similar to WatiN. /// <summary> /// Evaluates the specified JavaScript code within the scope of this /// document. Returns the value computed by the last expression in the /// code block after implicit conversion to a string. /// </summary> /// <example> /// The following example shows an alert dialog then returns the string "4". /// /// EvaluateJavaScript("window.alert('Hello world!'); 2 + 2"); /// /// </example> /// <param name="javaScriptCode">The JavaScript code</param> /// <returns>The result converted to a string</returns> /// <exception cref="JavaScriptException">Thrown when the JavaScript code cannot be evaluated /// or throws an exception during evaluation</exception> public string EvaluateJavaScript(string javaScriptCode) { const string resultPropertyName = "___expressionResult___"; const string errorPropertyName = "___expressionError___"; string exprWithAssignment = "try {\n" + "document." + resultPropertyName + "= String(eval('" + javaScriptCode.Replace("'", "\\'") + "'))\n" + "} catch (error) {\n" + "document." + errorPropertyName + "= 'message' in error ? error.name + ': ' + error.message : String(error)\n" + "}"; string result = null, error = null; Browser.Sync(delegate { // Prepare a property to acquire the result. IHTMLDocument2 domDocument = (IHTMLDocument2) DomReference; IHTMLWindow2 domWindow = domDocument.parentWindow; IExpando domDocumentExpando = (IExpando) domDocument; PropertyInfo resultProperty = InitializeExpandoProperty(domDocumentExpando, resultPropertyName); PropertyInfo errorProperty = InitializeExpandoProperty(domDocumentExpando, errorPropertyName); // Run the script. // The result value is not meaningful. domWindow.execScript(exprWithAssignment, "JavaScript"); // Obtain the result and error. result = (string)resultProperty.GetValue(domDocument, null); error = (string)errorProperty.GetValue(domDocument, null); }); if (error != null) throw new JavaScriptException(error); return result; } private static PropertyInfo InitializeExpandoProperty(IExpando expando, string propertyName) { PropertyInfo propertyInfo = expando.GetProperty(propertyName, BindingFlags.Instance); if (propertyInfo == null) propertyInfo = expando.AddProperty(propertyName); propertyInfo.SetValue(expando, null, null); return propertyInfo; } http://ayende.com/2285/eval-with-watin#comment5http://ayende.com/2285/eval-with-watin#comment5Thu, 05 Apr 2007 18:57:56 GMT@Stan, VERY cool! I wasn't aware of this possiblity http://ayende.com/2285/eval-with-watin#comment4http://ayende.com/2285/eval-with-watin#comment4Tue, 03 Apr 2007 22:15:36 GMTAyende, Here is a quick example: Assuming you have already inserted the following into the DOM: <script> function myeval() { return 33 + 44; } </script> The following code: Type scriptEngType = ie.HtmlDocument.Script.GetType(); int result = (int)scriptEngType.InvokeMember("myeval", BindingFlags.InvokeMethod, null, ie.HtmlDocument.Script, null); Console.WriteLine("Result: {0}", result); ...will print out: Result: 77 Hope that helps. http://ayende.com/2285/eval-with-watin#comment3http://ayende.com/2285/eval-with-watin#comment3Tue, 03 Apr 2007 21:58:04 GMT@Stan, Can you give ore details about it? document.execScript() has no return value. http://ayende.com/2285/eval-with-watin#comment2http://ayende.com/2285/eval-with-watin#comment2Tue, 03 Apr 2007 21:35:34 GMTAnother approach might be to insert the following into the DOM: <SCRIPT> function myeval() { return ... code goes here... } </SCRIPT> Then just execute that function using the document.Script property (defined on IHTMLDocument), which would allow you to capture the return value. It's a bit of a pain to use though because it only exposes the IDispatch interface so you either have to use reflection to make the appropriate call or use a loosely-typed language (Boo? ;) http://ayende.com/2285/eval-with-watin#comment1http://ayende.com/2285/eval-with-watin#comment1Tue, 03 Apr 2007 21:22:53 GMT