Getting ID from asp.net runat server in jQuery

Question

I\'m trying make some stuff in jQuery using ASP.NET. But the ID from runat=\"server\" is not the same as the id used in HTML.

I used to use this to get

Answer 1

<%= txtTest.ClientID %> should work but not in a separate javascript file where server side scripts do not execute. Another possibility is to use a class selector:

and then:

var value = $('.txtTest').val();