Tip

Controlling pop-up windows through JavaScript

Have you been wondering how to pop-up a new window in the center of the browser screen the way you desire. To actually center the pop up window, you need the use of the window objects outer width, and outer height property and screen object width and height property. Use the following code.

Function centerWindow() { if (document.all) { var xMax = screen.width, yMax = screen.height } else if (document.layers) { var xMax = window.outerWidth, yMax = window.outerHeight } else { var xMax = 640, yMax=480 } var xOffset = (xMax - 200)/2, yOffset = (yMax - 200)/2; window.open('testpage.htm','Example','width=200,height=200,screenX='+x Offset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'') }

This was first published in June 2001

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