Question

In ASP.NET, is it possible to use the

'<%= control.ClientID %>' 

in an external javascript file or must it be in the ASPX itself as script block?

If it is not possible, are there any tricks to make this work?

Answer 1

Or you could register your client id’s in an array and use this array in your javascript file.

Aspx(Js)

var pageControls = {
   'myControlId1' : '<%= control1.ClientID %>',
   'myControlId2' : '<%= control2.ClientID %>',
   ...
}

Javascript

alert(pageControls['myControlId2']);