check window open

Question

var windowUrl = \"\";
var windowName = \"mywin\";
var w = window.open(windowUrl, windowName, windowSize);
w.document.write(html);
w.document.close();

T

Answer 1

Try the following:

<script type="text/javascript">
function loadUniquePage(page) 
{
    if (opener && !opener.closed) {
        opener.focus();
    } else {
        var myWin = window.open(page,'','width=800,height=600');
        opener = myWin;
    }
}
</script>

also take a look at this question - JavaScript window.open only if the window does not already exist

also take a look on the link provided by @Aram Kocharyan:
https://developer.mozilla.org/en/DOM/window.closed