How can you insert a Javascript function into the page and then execute it?

[Chris Hansen]

I just started using CefSharp today and I was able to do this with the default Windows Forms web browser but I can't use that for what I need to do and here is what that looked like:

            HtmlElement head = browser.Document.GetElementsByTagName("head")[0];

            HtmlElement scriptEl = browser.Document.CreateElement("script");

            IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;

            element.text = "function enterJackpot() { $('#submit-wager').trigger('click'); }";

            head.AppendChild(scriptEl);

            browser.Document.InvokeScript("enterJackpot");

But this was in the regular Windows Forms browser, is there a way to do this exact same thing with CefSharp?

[Alex Maitland]

https://github.com/cefsharp/CefSharp/wiki/Frequently-asked-questions#1-how-do-you-call-a-javascript-methods-from-net

 

No need to declare a script block, once the browser has loaded you can execute a string of javascript. Obviously you can execute code directly or declare functions/classes.

 

Sent from Mail for Windows 10

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[Chris Hansen]

Thanks for the reply, but I'm not sure if I did it right. Would it just be something like this then?

browser.ExecuteScriptAsync("$('#submit-wager').trigger('click')");

This didn't work for me.

[Alex Maitland]

That looks fine. Are you waiting for the browser to finish loading?

https://github.com/cefsharp/CefSharp/blob/cefsharp/41/CefSharp/IWebBrowser.cs#L48

Check `IsLoading` property of the event args

[Chris Hansen]

Yes, the page is finished loading when I call it. It's just on a button click.

[Chris Hansen]

Thanks for the replies everyone but I figured it out. I tried a similar thing on a different site and it works there. The website I was using must have some sort of protection against this.

[Alex Maitland]

Incase your not aware, you can use the Chromium DevTools to debug javascript.

https://github.com/cefsharp/CefSharp/blob/cefsharp/41/CefSharp/IWebBrowser.cs#L304