When I use embedded javascript functions I can get client id of elements with this code:
document.getElementById('<%=buttonXXX.ClientID%>' )
But now I am using external javascript file for caching and faster rendering and this code does not work any more for getting client id's of elements, it gives error.
How can I get client id's of elements at external javascript file using asp.net 2.0 , netframework 3.5 , c# , iis 7.5