PDF output keeps on opening/poping

Question

Hi I have created a MVC that when user clicks on a button, it would open a smartform in PDF format in a new window. But when I try to click again anything on my main window, it opens again the PDF file in a new window and the user cannot do anything more because of this. I am using this code:
<%
    IF display_url IS NOT INITIAL.
%>
      <script language="Javascript">
        window.open("<%= display_url%>").focus();
      </script>
<%
    ENDIF.
%>
Please help me solve this. Thanks.

Answer 1

I did a clear after opening the PDF like this:
<% IF display_url IS NOT INITIAL.%>
  <script = Javascript>
  window.open(<%=display_url%>).focus();
  <script>
<% clear display_url.
   ENDIF.
%>
And it is cleared. But when I click another button and the DO_REQUEST is called, the display_url contains the PDF url. that is why it opens again the page. I think the clearing doesn't update my class attribute (display_url).
Where can I clear the display_url so that this class attribute(display_url) will be cleared?