What is the best way to center an absolutely positioned div within Internet Explorer 7?

ENSURING PROPER LAYOUT CONTEXT

I am working with a simple layout for my webpage. It consists of two divs that are both positioned absolutely, with one centered within the other.

<div id="protocol_index_body_wrapper">
    <div id="protocol_index_body">
    </div>
</div>

This structure is styled with the following CSS:

#protocol_index_body_wrapper {
    background: url("/images/stripe.png") repeat scroll 0 0 transparent;
    position: absolute;
    top: 120px;
    left: 0px;
    right: 0px;
    bottom: 10px;
}
#protocol_index_body {
    width: 960px;
    margin: 0 auto;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

}

The desired outcome is shown in the image provided. This layout works as expected in IE8, Firefox, and Chrome. However, in IE7, the centered div appears flush against the left side instead. Any suggestions on how to address this issue?

htmlcssinternet-explorerlayoutinternet-explorer-7

Answer №1

Here's a helpful suggestion:

#protocol_index_body {
    width: 50px;
    margin: 0 auto 0 -25px;
    position: fixed;
    top: 0;
    left: 50%;
    right: 0;
    bottom: 0;
    background-color: red;
}

Alternatively...

#protocol_index_body {
    width: 50px;
    margin: 0 auto 0 50%;
    position: fixed;
    top: 0;
    left: -25px;
    right: 0;
    bottom: 0;
    background-color: red;
}

Answer №2

If there is no need for the parent div to have a flexible width (which might seem unnecessary if you're already defining the child div's width), then why not simply specify the parent div's width and include margin: 0 auto?

Answer №3

After experimenting with it, I discovered that this code functions the same in Firefox, Opera, and Internet Explorer 7:

#protocol_index_body_wrapper {
  background-color:black;
  padding: 0 0 20px 0;
  position: absolute;
  top: 120px;
  left: 0px;
  right: 0px;
  bottom: 10px;
  text-align: center;
  width: 100%;
  height: 100%;
}
#protocol_index_body {
  width: 50px;
  margin: 0 auto;
  background-color: red;
  height: 100%;
}

Answer №4

alignCenter = function() {

    var pageWidth = $("body").innerWidth();
    var contentWidth = $("#content_container").innerWidth();
    if(contentWidth < pageWidth) {

        $("#content_container").css("left", ((pageWidth - contentWidth)/2) + "px");

    }

}

window.onload = alignCenter;
window.onresize = alignCenter;
jQuery(window).load(function () { 

    alignCenter()

});

Answer №5

Set the wrapper to have text aligned in the center using <div align=center>
(not visually appealing, but effective)

Another option is with JavaScript:

Adjust the right margin of the element "protocol_index_body_wrapper" based on the client's screen width by calculating (clientWidth - 50)/2_+"px"

This method is compatible with IE6 and newer versions.

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