Question

The HtmlObject provides all the necessary functionality to register managed event handlers for script and DOM events, but what if the class you need to listen to doesn’t exist as a DOM element, but a scripting variable (referenced via ScriptObject) instead?

Answer 1

As stated by AnthonyWJones, Silverlight can’t attached to JavaScript events. The right thing to do in this situation is to do the following:

Enable scripting access in Silverlight:

1. Mark the class with the
   ScriptableType attribute, or mark
   the specific methods with
   ScriptableMember
2. Call
   HtmlPage.RegisterScriptableObject in
   the constructor.

Once everything is set up in the Silverlight code, here’s what you do in JavaScript:

1. Obtain a reference to the JavaScript
   object and register an event handler
2. Use document.getElementById to get
   the Silverlight control
3. Call .Content.. in the
   JavaScript event handler. For
   example,
   silverlight.Content.Page.UpdateText(text).

So basically, all event handling is performed in JavaScript, but the JavaScript event handlers can be used to call functions in Silverlight.