Question

I have desktop application with WebBrowser control and try to inject JavaScript into loaded page.

For this I added two script elements:

private static void AddJQueryElement(HtmlElement head)
{
    HtmlElement scriptEl = head.Document.CreateElement("script");
    IHTMLScriptElement jQueryElement = (IHTMLScriptElement)scriptEl.DomElement;
    jQueryElement.src = @"http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js";

    head.AppendChild(scriptEl);           
}

private static void AddScriptElement(HtmlElement head)
{
    HtmlElement scriptEl = head.Document.CreateElement("script");
    IHTMLScriptElement myScriptElement = (IHTMLScriptElement)scriptEl.DomElement;
    myScriptElement.src = @"file:///c:\JScript.js";
    head.AppendChild(scriptEl);
}

how you can see first is reference to jQuery because I use it in my script. When I try to invoke function from my script using _webBrowser.Document.InvokeScript WebBrowser throws
Script Error :”Object expected”. and points to the line where i try to use jQuery (var tags = $("Body").find("*");).

How can I prevent this error?

Another interesting thing: if I add something like alert("hello"); to start of my function all works fine.

Answer 1

Haven’t got correct answer, but have solved the problem by using local copy of jquery.min.js.