Javascript alert message not showing up

Question

I have a page written in asp.net, in which i am calling javascript alert message and it is not showing up, if i clear cache memory of browser then the alert message is showing up. Can any body tell the reason and solution.

Answer 1

Use onClientClick like this

 <asp:Button ID="btnSubmit" OnClick="btnSubmit_click()" OnClientClick="return check()"    
     runat="server"/>

  <script type="text/javascript">
    function check() {
       if (confirm('Are you sure you want to submit ?')) {
          // do further form validation here..  
          return true;

        }
        else {
            return false;
        }
    }
  </script>