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     function after_action_login(){
     echo "<script>
      alert('This is a popup message');
      </script>";
}

the code above is part of my ApplicationDelegate.php.

My problem is that after the alert box has displayed and the user clicks ok to close the window I get this error:

Warning: Cannot modify header information - headers already sent by (output started at .../conf/ApplicationDelegate.php:34) in .../xataface/Dataface/AuthenticationTool.php on line 281

Any ideas?

The action_after_login() trigger is fired after successfully logging in. You shouldn't be outputting anything here. You could put a redirect here, or other book-keeping stuff... but nothing that is written to the browser.

If you want to add Javascript to a particular page you'll want to look at blocks and slots rather than triggers.

-Steve