I know there are plenty of answers surrounding this topic but I just cannot get this to work.

I need to prevent a link button posting back and the following code is not working. The code is definitely being hit in all the required places.

Link button definition:

  <asp:LinkButton ID=NavHelp OnClientClick=showConfirm(event); OnClick=NavHelp_Click ToolTip=Help runat=server></asp:LinkButton>

Javascript function (definitely being hit)

function showConfirm(event) {

  event.stopPropagation();

  return false;

}

However after showConfirm returns false the link button still posts back to the server side NavHelp method.

As a side note, I also put a breakpoint in the __doPostback method generated by .NET and it does get hit after showConfirm returns false.

Can anyone shed any light on this?