Center a popup window on screen?

05/12/2020 06:00:01

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 ?

Verified Answer (454 Votes)

05/31/2013 20:40:33

SINGLE/DUAL MONITOR FUNCTION (credit to http://www.xtf.dk - thank you!)

UPDATE: It will also work on windows that aren't maxed out to the screen's width and height now thanks to @Frost!

If you're on dual monitor, the window will center horizontally, but not vertically... use this function to account for that.

const popupCenter = ({url, title, w, h}) => {
    // Fixes dual-screen position                             Most browsers      Firefox
    const dualScreenLeft = window.screenLeft !==  undefined ? window.screenLeft : window.screenX;
    const dualScreenTop = window.screenTop !==  undefined   ? window.screenTop  : window.screenY;

    const width = window.innerWidth ? window.innerWidth : document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width;
    const height = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height;

    const systemZoom = width / window.screen.availWidth;
    const left = (width - w) / 2 / systemZoom + dualScreenLeft
    const top = (height - h) / 2 / systemZoom + dualScreenTop
    const newWindow = window.open(url, title, 
      `
      scrollbars=yes,
      width=${w / systemZoom}, 
      height=${h / systemZoom}, 
      top=${top}, 
      left=${left}
      `
    )

    if (window.focus) newWindow.focus();
}

Usage Example:

popupCenter({url: 'http://www.xtf.dk', title: 'xtf', w: 900, h: 500});  

CREDIT GOES TO: http://www.xtf.dk/2011/08/center-new-popup-window-even-on.html (I wanted to just link out to this page but just in case this website goes down the code is here on SO, cheers!)

454

Answer #2 (328 Votes)

11/01/2010 16:18:32

try it like this:

function popupwindow(url, title, w, h) {
  var left = (screen.width/2)-(w/2);
  var top = (screen.height/2)-(h/2);
  return window.open(url, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
} 
328

Answer #3 (64 Votes)

08/28/2015 04:54:05

Due to the complexity of determining the center of the current screen in a multi-monitor setup, an easier option is to center the pop-up over the parent window. Simply pass the parent window as another parameter:

function popupWindow(url, title, win, w, h) {
    const y = win.top.outerHeight / 2 + win.top.screenY - ( h / 2);
    const x = win.top.outerWidth / 2 + win.top.screenX - ( w / 2);
    return win.open(url, title, `toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=${w}, height=${h}, top=${y}, left=${x}`);
}

Implementation:

popupWindow('google.com', 'test', window, 200, 100);
64
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