ASP.NET OnClientClick=“return false;” doesn't work

Question

I just want to add some client side (JQuery Javascript) validation in a web user control. I put an OnClientClick handler and the function gets called. BUT, even if I return

Answer 1

Try changing it to

OnClientClick="ValidateMail(); return false;" 

Answer 2

Do you have a click event handler (registered via jquery) which returns true? In that case, the return value of OnClientClick is ignored.

Have a look at my question (and answer): Why doesn't returning false from OnClientClick cancel the postback

Answer 3

for some reason, although I didn't have any jquery event handlers attached, it didn't work.

What actually worked was:

OnClientClick="if (validate_form() == false) return(false);"

Answer 4

oddly enough this worked for me:

OnClientClick="javascript:SubmitTableData(); return CanSubmit();"

set the return value submit with the first function call:

function CanSubmit() {    
    return submit;
}

Hope this helps someone.

Answer 5

Just add javascript:

Example:

javascript:return ValidateMail();

Answer 6

Great answers. I do it this way. Same result- the OnClick event is not fired off if false is returned from Java function.

OnClientClick = "if (!ValidateDelete()) return false;"
OnClick="btnDeleteSupplier_Click"