Center a popup window on screen?

Question

How can we center a popup window opened via javascript window.open function on the center of screen variable to the currently selected screen resolution ?

Answer 1

function fnPopUpWindow(pageId) {
     popupwindow("hellowWorld.php?id="+pageId, "printViewer", "500", "300");
}

function popupwindow(url, title, w, h) {
    var left = Math.round((screen.width/2)-(w/2));
    var top = Math.round((screen.height/2)-(h/2));
    return window.open(url, title, 'toolbar=no, location=no, directories=no, status=no, '
            + 'menubar=no, scrollbars=yes, resizable=no, copyhistory=no, width=' + w 
            + ', height=' + h + ', top=' + top + ', left=' + left);
}

Print Me

Note: you have to use Math.round for getting the exact integer of width and height.