WPF Webbrowser C# JavaScript interop

Question

I am working on an application that is for the most part html/javascript (the whole "HTML5" thing) with a light shell of a WPF application so that it can interact with local resources.

The application has a single HTML file which I navigate to programmatically. Once the file is loaded, I am trying to attach event handlers so I can handle specific events in C#.

When I try to use the mshtml objects, it appears that I only get nulls back. For example, here is some code:

string initUrl = "file:///" + Path.Combine(Environment.CurrentDirectory, Path.Combine("Pages", "ComposeSurface.html"));
navBrowser.Navigate(new Uri(initUrl));

navBrowser.Navigated += (o, e2) => 
{ 
    HTMLDocumentClass documentObject = navBrowser.Document as HTMLDocumentClass;
    IHTMLElement ele = documentObject.getElementById("initButton");
    if (ele != null)
    {
        Func<IHTMLEventObj, bool> evra = (arg) => { MessageBox.Show("Hello"); return true; };
        ele.onclick = evra as object;
    }
};

getElementById always seems to return a null, however. I've double checked and the id of the element is consistent.

My second question has to do with handling the event - will this work for a click event from a regular HTML form button as far as attaching some C# to it?

Aaron Ray · Accepted Answer · 2011-07-09 04:53:12Z

2

Try using the LoadCompleted event. The document could still be downloading during the Navigated event.

http://msdn.microsoft.com/en-us/library/system.windows.controls.webbrowser.navigated.aspx

http://msdn.microsoft.com/en-us/library/system.windows.controls.webbrowser.loadcompleted.aspx

answered Jul 9, 2011 at 4:53

Aaron Ray

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