Popup Windows: From a Form

For our next variation on the popup theme we're going to open the popup from a form. In this example we're going to change the script around. The following script is custom designed for opening a popup from a form. (We'll gloss over the details of how the script works for now. For the gory details on this script see Under the Hood: The Popup From a Form Script.) It works with forms that use both POST and GET. Copy the following script exactly as-is into the <HEAD> section of your document:

<SCRIPT TYPE="text/javascript">
<!--
function popupform(myform, windowname)
{
if (! window.focus)return true;
window.open('', windowname, 'height=200,width=400,scrollbars=yes');
myform.target=windowname;
return true;
}
//-->
</SCRIPT>

Now we'll add some code so that the popup opens when the user submits the form. Add an onSubmit attribute to <FORM ...> tag:

<FORM METHOD=POST
ACTION="../cgi-bin/mypopupcgi.pl"
onSubmit="popupform(this, 'join')">

The first argument for popupform() is always this, meaning the form itself. The second argument, 'join' in this case, is a unique name for the popup.