Make async event synchronous in JavaScript

Question

I\'m using the WPF 3.5SP1 WebBrowser control to display a page containing some javascript functions. My program then needs to invoke a javascript function which will make an

Answer 1

Is there a way I can make the first javascript function sleep until something happens (with out locking up the browser)?

Yes - you can use the asynchronous function as it was intended to be used: pass it a callback, and let it do its thing. You should be able to pass a callback from C# into your JS function, which can then either pass it to your asynchronous function directly, or wrap it in another function if post-processing is required.

---

An example of the implementation of a callback - this works with the WinForms WebBrowser control, i haven't tested it with WPF but they should be pretty much the same:

[System.Runtime.InteropServices.ComVisibleAttribute(true)]
public class Callback
{
   // allows an instance of Callback to look like a function to the script
   // (allows callback() rather than forcing the script to do callback.callMe)
   [System.Runtime.InteropServices.DispId(0)]
   public void callMe(string url)
   {
      // whatever you want to happen once the async process is complete
   }
}

...

Callback cb = new Callback();
WebBrowser.InvokeScript("myscript", new object[] { cb })

...

function myscript(callback)
{
   some_async_function(function()
   {
      // script-specific completion code
      if ( callback )
         callback();
   });
}