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Asked: 2026-05-10T19:10:00+00:00

I have asp.net form that contains fields. When I access this window, my javascript

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I have asp.net form that contains fields. When I access this window, my javascript functions can access the fields via the DOM with the getElementById() method and when I postpack to the server I am receiving the updates made by the client.

However, when I launch the form as a child window using Telerik’s RadWindow control, the javascript can not access the hidden fields on the child form. Instead I get null.

My questions are:

  1. Are hidden fields on a child window not accessible when the window is launched from a parent asp.net form?
  2. Has anyone attempted this with Telerik controls and run into issues?

EDIT Craig pointed out that the id may be different. Two additional questions then:

  1. Can you ensure that the id you assign at the server is actually used?
  2. Is using getElementByName() a better mechanism to access DOM elements?
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1 Answer

  1. To get the ID of your asp.net control do something like this:

    <%= theControl.ClientID %>

    getElementByName is not as commonly used as getElementById. The ID attribute is supposed to be unique for each element on the page whereas the name attribute can be duplicated.

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