Call JS from managed code in EB VB (Window.Invoke)

10-08-2008 5:54 PM |

I am trying to call JS from managed code using Expression Blend as decribed in the link below.
http://msdn.microsoft.com/en-us/library/cc221359(vs.95).aspx

I know the example is for VS2008, but should it not work in EB as well?

I get the errors:
* Name 'ControlChars' is not defined
* Namespace or type specified in the Imports 'System.Windows.Hosting' doesn't conain any public member or cannot be foiund. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases.

I have tried simplifying the "HtmlPage.Window.Invoke" as well as the JS method.
The project then builds, but the part of the page containing the Silverlight app gets blank, only the html button shows.
(And is not working)

Re: Call JS from managed code in EB VB (Window.Invoke)

10-08-2008 7:33 PM |

Make sure you only call into HtmlPage properties/methods when HtmlPage.IsEnabled returns true. In Blend it should always return false.

Re: Call JS from managed code in EB VB (Window.Invoke)

10-10-2008 8:27 AM |

 Hi, thanks for the reply.

Can you please clarify what you mean by "calling into"?

I have read this page on HtmlPage.IsEnabled, with no luck.
http://msdn.microsoft.com/en-us/library/system.windows.browser.htmlpage.isenabled(VS.95).aspx

When trying to get the value:

Dim value As Boolean
value = HtmlPage.IsEnabled

I ge an error message, regardles of where I have tried to put the code (even within a new sub).

Do I have to set the value or wait for the value to get set to true?
How do I do that?

Re: Call JS from managed code in EB VB (Window.Invoke)

10-13-2008 4:33 PM |

Sorry,

This should work with vb.net

HtmlPage.Window.CreateInstance("JavascriptFunction...", Parm1)