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Javascript in htmlplaceholder to Silverlight

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HTMLPlaceHolder

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answered on 23 Jul 2009, 02:46 PM

Hi Reddy,

I am not sure if I understand you correctly, you ask:
" I need to call a function in silverlight control from the html hosted by the htmlplaceholder."

1. If you mean how to call in Silverlight a JavaScript function from the HTML hosted by the Htmlplaceholder then all you need to do is the following:

in JavaScript

function test() {
                window.alert("This is a test function");
            }
in Silverlight

           // Get the IFrame from the HtmlPresenter
            HtmlElement iframe = (HtmlElement)RadHtmlPlaceholder1.HtmlPresenter.Children[0];
            // Set an ID to the IFrame so that can be used later when calling the javascript
            iframe.SetAttribute("id", "myIFrame");
            // Code to be executed
            string code = "document.getElementById('myIFrame').contentWindow.test();";
            HtmlPage.Window.Eval(code);

2.If you want to call managed C# code from JavaScript then take a look at the following articles:
http://silverlight.net/quickstarts/htmlbridge1.aspx#html_bridge_overview
http://msdn.microsoft.com/en-us/library/cc221414(VS.95).aspx

Please l

answered on 09 Sep 2009, 12:18 AM

I have a silverlight page which includes a RadHtmlPlaceholder.
RadHtmlPlaceholder has a web page which has controls (e.g. buttons).
When the button is clicked, I want to handle that event in Silverlight.

This article points to Microsofts article

http://silverlight.net/quickstarts/htmlbridge1.aspx#html_bridge_overview

Which shows some sample code like..

public Page()

{

InitializeComponent();

HtmlDocument htmlDoc = HtmlPage.Document;

...

// Add an event handler for the Convert button.

HtmlElement htmlEl = htmlDoc.GetElementById("Convert");

htmlEl.AttachEvent("onclick", new EventHandler(this.OnConvertClicked));

}

void OnConvertClicked(object sender, HtmlEventArgs e)

{

}

But this is for caller page not RadHtmlPlaceholder. Please show some samples for RadHtmlPlaceholder.

I need help mainly on how to get the HtmlElement inside RadHtmlPlaceholder by name.

answered on 09 Sep 2009, 07:15 AM

Hello Srinivas,

the article you are pointing to is working when the buttons are on the same page where the silverlight application is. Since you are using external page this will not be possible.

If the page you are using is from the same domain you can still do it, but in a very different way.

You will need first to handle the button clicks inside the page where you have registered the Silverlight application. Then you can simply call a method from the Silverlight application to get notified about the button click.

All the best,
Valentin.Stoychev
the Telerik team

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