Inject JavaScript with jQuery at runtime into WebBrowser

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.

Denis Palnitsky · Accepted Answer · 2010-07-26 12:30:15Z

1

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

answered Jul 26, 2010 at 12:30

Denis Palnitsky

18.4k14 gold badges49 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Johnydep Over a year ago

Hey Orsol, can you tell me how you connected to the webpage. I mean how your application connects to the page. I really want to do that but can't figure it out how to do that.

Denis Palnitsky Over a year ago

I load page in a WebBrowser control.

Furkan Gözükara Over a year ago

can you please include your full code ? i am getting $ undefined error. but plain javascript working.

ryan · Accepted Answer · 2010-07-23 15:08:57Z

0

It's possible you aren't specifying your script to run on load. alert("hello") is buying that time needed to download the script/finish building the HTML.

$(document).ready(function() {
  // Handler for .ready() called.
});

answered Jul 23, 2010 at 15:08

ryan

6,6856 gold badges45 silver badges70 bronze badges

Collectives™ on Stack Overflow

Inject JavaScript with jQuery at runtime into WebBrowser

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related