Issues with pop-up windows not displaying properly in JavaScript

Below is the code snippet I am working with -

int p = 0;

        try
        {

            p = System.Convert.ToInt16(txt7.Text);
        }
        catch
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "showMyMessage", "ShowMessage('Value must be numerical');", true);
        }

Additionally, here is the function -

 <script>

  function ShowMessage(message) { alert(message); }

</script>

Even though the code enters the catch block during debugging, the expected pop-up is not appearing on the front end. Can you help me identify what I might be overlooking?

Answer №1

Ensure to place your script at the beginning of the page, either within the body tag or head tag, as this may be causing the issue. The initial script call needs to be positioned beneath the script you have mentioned. For optimal efficiency, it is recommended to structure it as shown below

<script type="text/javascript>

  function DisplayAlert(text)
   {
        alert(text); 
   }    
</script>

Answer №2

When working with UpdatePanels, it is recommended to utilize ScriptManager.RegisterStartupScript for better functionality.

Answer №3

Specify the script type and ensure it is situated at the beginning.

 <script type="text/javascript">

 function DisplayNotification(notification)
 {
  alert(notification);
 }

</script>

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