Javascript to Silverlight when Silverlight instantiated with object tag

I've used an object tag to load my Silverlight control because I want to be able to input html into a Sharepoint page using the Rich Text Editor. It looks like this:

<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" id="SilverlightObject"
    width="850" height="600">
      <param name="source" value="ClientBin/LabsSurvey.xap"/>
      <param name="onError" value="onSilverlightError" />
      <param name="minRuntimeVersion" value="3.0.40624.0" />
      <param name="autoUpgrade" value="true" />
      <img src="ClientBin/InstallSilverlightLabsBanner.jpg" alt="Please Install Silverlight" />
      <br />
      <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration:none">
          <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style:none"/>
      </a>

    </object>

I've use the Javascrip开发者_运维百科t bridge in other Silverlight apps, and it works great for two-way communication between the web page and the Silverlight control.

BUT - it seems that in order for this to work, I have to instanciate my Silverlight control using the .NET Silverlight control.

I can not get a javascript call to a method within my Silverlight control to work when I've used the object tag. I set it up exactly the same way as in my other apps where it does work - the only difference is that the control was not embedded the same way in the html.

Does anyone have any tips for me?

It's also key to include the windowless parameter in your object definition in addition to the information called out in the answer from Kelsey. Without windowless=true, the call to Content will always return undefined....

Sample object definition:

    <div id="silverlightControlHost">
    <object id="silverlightObject" data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
      <param name="source" value="ClientBin/LabsCharts.xap"/>
      <param name="onError" value="onSilverlightError" />
      <param name="background" value="white" />
      <param name="windowless" value="true" />
      <param name="minRuntimeVersion" value="3.0.40624.0" />
      <param name="autoUpgrade" value="true" />
      <a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration:none">
          <img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style:none"/>
      </a>
    </object><iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"></iframe></div>

VB.Net class to register scriptable object:

Imports System.Windows.Browser

_ Partial Public Class MainPage Inherits UserControl

Public Sub New()
    ' Required to initialize variables
    InitializeComponent()
    AddHandler Loaded, AddressOf MainPage_Loaded
End Sub

Protected Sub MainPage_Loaded(ByVal sender As Object, ByVal e As EventArgs)
    HtmlPage.RegisterScriptableObject("MainPage", Me) 'not working!

    Dim so As ScriptObject = TryCast(HtmlPage.Window.Eval("charts"), ScriptObject)
    so.Invoke("registerSilverlight")
End Sub

Public Sub SayHi() MessageBox.Show("HI!!!!!") End Sub

End Class

And the javascript function, registerSilverlight

var charts = {
registerSilverlight: function() {

    var func = document.getElementById('silverlightObject');
    var content1 = func.Content;
    content1.MainPage.SayHi();


}

}

You might want to check out this thread:

How to call javascript function on a Silverlight 3 object?

I had problems as well and got it all working using the object tag.