Center Dynamic Content

Oct 16, 2006

I need to center (horizontally as well as vertically) a div on screen. It will be in front of everything else on the page and will include dynamic HTML content. (radio buttons, text input, etc.) Essentially it's an in-page popup. (Don't call me evil, this is for a game I'm making.) So far I can get FF to center it with this code:

function ShowBox(str,MsgBox){
MsgBox.innerHTML = str;

var style = gStyle(MsgBox,null);
var h = parseFloat(style.height);
var w = parseFloat(style.width);

MsgBox.style.left = (gWinWidth() - w) / 2 + "px";
MsgBox.style.top = (gWinHeight() - h) / 2 + "px";


MsgBox.style.display = "block";
}


Where gStyle is a cross-browser alias for getComputedStyle, str is the message I want displayed in the box, and MsgBox is the div that acts as the popup. Code:

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