Question

I have a Silverlight application that generates a lot of Google Maps objects on the Silverlight site. For example a Map is created like this:

var map = HtmlPage.Window.CreateInstance(@"google.maps.Map", container, mapOptions);
var center = (ScriptObject)_map.Invoke("getCenter");

Everything works fine. But now I need to access the map object from Javascript directly. I think it could be done by exposing a map property as ScriptableMember and use it from Javascript. But that”s a bit odd because the map object lives already in the browser. But how do I access it?

Update

Just to make clearer what I’m talking about

Let’s say I have created my map as shown above. Now I have a loaded Javasript file with this function:

function ReadMapCenter()
{
  //Need the map object in Javascript
  map.getCenter();
}

How can I access the existing map Object from Javascript?

Answer 1

If you just expose it as type ScriptObject I think the bridge will simply unpack the scripted object rather than create yet another layer of wrapping for it.

Alternative

Don’t use CreateInstance

In your javascript at the global leve use:-

var map;
function createMap(container, mapOptions)
{
     if (!map)
     {
        map = new google.maps.Map(container, mapOptions);
     }
     return map;
}

now your javascript has a map global it can use.

In silverlight use:-

 var map = HtmlPage.Window.Invoke("createMap", container, mapOptions);