ID problem in radpane

[york]

Hi,

I tried to fill radpane in radsplitter with radtreeview. When I used

var tree = $find("<%=RadTreeView1.ClientID %>");
tree.style.height = "100px";

It crushed because tree is null. But when used

var tree = document.getElementById("RadTreeView1");
tree.style.height = "100px";

It worked fine. Why is that?

[Marin Bratanov]

Hello York,

I have already replied to this question in the other thread you posted. But for your convenience and to help others with similar problems I am posting it here, too:

To get a null object you have probably attempted to get a reference to the object with the $find() method before the controls are initialized.

On the other hand, you are actually trying to set a CSS style to an HTML element, so you need an object with a reference to an HTML element, not to a JavaScript object, as these objects do not have styles. This means that you must use the $get() method (a shortcut to the getElementById() method you are using) to get the reference.

On the difference between these methods you can read in the MSDN articles on $find(), getElementById() and in this blog post.

Regards,
Marin
the Telerik team