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07.22.2008 at 03:36AM PDT, ID: 23584627
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9.5

Center a DIV - Firefox/IE issues

Asked by tigermatt in Dynamic HTML (DHTML), JavaScript, Document Object Model

Tags: , , , , , ,

I'm using the below code to center - vertically and horizontally - the DIV with id "window" on a page. In IE 6 and 7, the code works perfectly fine and the div appears in the center of the screen; however, Firefox refuses to center the div and places it in the top-left corner.

The div element in question is configured with a z-index higher than the page - and I know something is working, because IE works.

Where have I gone wrong?Start Free Trial 
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function showPopup()
{
 
if (document.getElementById && !document.all) // Detect FF
{
 
var IpopTop = (window.innerHeight - document.getElementById("window").offsetHeight)/2;
var IpopLeft = (window.innerWidth - document.getElementById("window").offsetWidth)/2;
document.getElementById("window").style.left = IpopLeft + window.pageXOffset;
document.getElementById("window").style.top = IpopTop + window.pageYOffset;
}
else // Just assume otherwise (IE) at this stage.
{
 
var IpopTop = (document.body.clientHeight - document.getElementById("window").offsetHeight)/2;
var IpopLeft = (document.body.clientWidth - document.getElementById("window").offsetWidth)/2;
document.getElementById("window").style.left = IpopLeft + document.body.scrollLeft;
document.getElementById("window").style.top = IpopTop + document.body.scrollTop;
}
document.getElementById("window").style.visibility = "visible";
document.getElementById("greypage").style.visibility = "visible";
}
 
 
<div id="window" style="position: absolute;z-index:4;padding:5px;visibility:hidden;display: block;margin:0 auto;width:500px;border:1px solid #000000;background-color: #FFFFFF;">Populated by AJAX</div>
[+][-]07.22.2008 at 06:24AM PDT, ID: 22059051

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About this solution

Zones: Dynamic HTML (DHTML), JavaScript, Document Object Model
Tags: dhtml, javascript, center in page, firefox, internet explorer, incompatibility, inconsistency
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Solution Provided By: MMDeveloper
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.22.2008 at 02:23PM PDT, ID: 22063826

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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[+][-]07.23.2008 at 05:44PM PDT, ID: 22075316

Assisted solutions are selected by the member who asked the question as a comment that contributed to their question's solution.

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