How do I pass a server control's actual client Id to a javascript function?

Question

I have the following textbox server control in my web page:

Answer 1

I solved the same problem with an

When using <%= TargetControl.ClientID %> (without single quotes surrounding), ASP.NET renders '<%= TargetControl.ClientID %>' and the associated javascript function isn´t called.

When using '<%= TargetControl.ClientID %>' (with sigle quotes surrounding), ASP.NET don´t evaluates the expression and renders exactly the same inside the single quotes.

So I decide to try with an Input(Checkbox) HTLM control instead, using the following markup

and it worked!!!

Hope it helps.