Question

I have this bit of javascript that will detect popup browsers disabled and the javascript is working BUT I want to have a div show the error instead of just the browser alert, but I just can’t figure out why it’s my div is not showing up. Any help would be greatly appreciated. Thank you!

HTML:

<span id="popupBrowserAlert" style="background-color:#ffdd77;display:none;" >Your popup blocker is enabled</span>

JS:

var wPopup = 'newPopup';
var popUp = window.open('page url', wPopup, 'width=800, height=600, left=24, top=24, scrollbars, resizable');



if (popUp == null || typeof(popUp) == 'undefined') {

    document.getElementById('popupBrowserAlert').style.display = 'block';
}
else {
    popUp.focus();
}

Answer 1

You can simply use this:

if (!popUp) {...}

This works if the value of popUp is false, undefined, null, '' or 0.