Tuesday, 3 December 2013

Unable to get value of the property 'toLowerCase': object is null or undefined

Open a modal RadWindow inside another RadWindow (or iframe) in IE9 and IE10 and avoid the JavaScript error this can cause because of a browser bug.

Note: This also applies to the server RadAlert(), RadConfirm() and RadPrompt() methods and the radopen(), radalert(), radconfirm() and radprompt() client-side methods when called from the server in the Sys.Application.Load event.

This can be solved by adding  a new method OnClientBeforeShow="fixIE" of

  <telerik:RadWindowManager ID="radWinManager"
            runat="server" DestroyOnClose="True" OnClientBeforeShow="fixIE"


  function fixIE() {

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