How to Center a Popup Window on Screen in Both Single and Dual Monitor Setups?

How to Center a Popup Window on Screen

To center a popup window on screen, we can utilize JavaScript's window.open function and some additional calculations to determine the exact x and y coordinates based on the current screen resolution.

Single/Dual Monitor Function

For both single and dual-monitor setups, the following function effectively centers the popup window horizontally while accounting for the possibility of it not being fully maximized:

<code class="javascript">const popupCenter = ({url, title, w, h}) => {
  // Adjust for dual-screen position
  const dualScreenLeft = window.screenLeft !== undefined ? window.screenLeft : window.screenX;
  const dualScreenTop = window.screenTop !== undefined ? window.screenTop : window.screenY;

  // Calculate available screen dimensions
  const width = window.innerWidth || document.documentElement.clientWidth || screen.width;
  const height = window.innerHeight || document.documentElement.clientHeight || screen.height;

  // Adjust for system zoom
  const systemZoom = width / window.screen.availWidth;

  // Calculate centered coordinates
  const left = (width - w) / 2 / systemZoom + dualScreenLeft
  const top = (height - h) / 2 / systemZoom + dualScreenTop

  // Open the new window
  const newWindow = window.open(url, title, 
    `
    scrollbars=yes,
    width=${w / systemZoom}, 
    height=${h / systemZoom}, 
    top=${top}, 
    left=${left}
    `
  )

  // Bring the new window to focus
  if (window.focus) newWindow.focus();
}</code>

Usage Example

To center a popup window at screen resolution 900x500 with the title "XTF":

<code class="javascript">popupCenter({url: 'http://www.xtf.dk', title: 'XTF', w: 900, h: 500});</code>

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