February 13, 2019 11:09 by
PeterToday, I am going to show you how to fixed Silverlight 6 Control Content always null from Javascript Access. I got an Error when I try to access the Silverlight object from the client side. Here’s the following snippet code from client site.
function search() {
try {
var silverLightControl = document.getElementById("silverlightControl");
silverLightControl.Content.Page.SetUser(document.getElementById("txtUser").value);
} catch (e) {
alert(e.description);
}
}
The page with silverlight object embedded
<div id="silverlightControl">
<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
<param name="source" value="ClientBin/SLAspxCommunication.xap"/>
<param name="onError" value="onSilverlightError" />
<param name="background" value="white" />
<param name="minRuntimeVersion" value="5.0.61118.0" />
<param name="autoUpgrade" value="true" />
<a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=5.0.61118.0" style="text-decoration:none">
<img src="http://go.microsoft.com/fwlink/?LinkId=161376" 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>
At the silverlight object class, we have registered the page as javascriptable object with following line
HtmlPage.RegisterScriptableObject("Page", this);
public MainPage()
{
InitializeComponent();
_users = GenerateList();
HtmlPage.RegisterScriptableObject("Page", this);
}
The function looks simple that I just want to call the Silverlight function to search the user, unfortunately. This error message below always popped up.
When I debug the process, it indicate that the control did not contain a Content element. This Error
var silverLightControl = document.getElementById("silverlightControl");
It will load the Div Control instead of the object container that host the silverlight object. After I set the id to be silverlightControl for the object tag. then search function funtion well and access the SetUser function in the silverlight object.
<div>
<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%" id="silverlightControl">
<param name="source" value="ClientBin/SLAspxCommunication.xap"/>
<param name="onError" value="onSilverlightError" />
<param name="background" value="white" />
<param name="minRuntimeVersion" value="5.0.61118.0" />
<param name="autoUpgrade" value="true" />
<a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=5.0.61118.0" style="text-decoration:none">
<img src="http://go.microsoft.com/fwlink/?LinkId=161376" 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>
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