How to fix Absolute Positioning In FF?_问答_开发者

In IE8 absolute positioning works for being based of the parent. I can't seem to get it to work in FF. This is opposite of the problem people normally complain about.

Does anyone have any guess what is wrong?

Grae

Here is a sample:


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html>
<head>
    <script type="text/javascript" language="JavaScript">
        function firstChildC(startNode)
        {
            var nextNode = startNode.firstChild;

            while(nextNode.nodeType != 1)  //loop until it is an actual tag, not white space
                nextNode = nextNode.nextSibling;

            return nextNode;
        }

        var bFirefox = false;

        if (navigator.userAgent.indexOf("Firefox") != -1)
            bFirefox = true;

        function highlightPosition(event)
        {
            //gets the td that holds the pre tag, which holds the data
            var preTag;
            if(bFirefox)
                preTag = event.target;
            else
                preTag = event.srcElement;

            var containerOfPreTag = preTag.parentNode;
            var lineCountTD = firstChildC(containerOfPreTag.parentNode);
            var numLines = parseInt(lineCountTD.innerHTML);
            var lineHeight = preTag.offsetHeight/numLines;

            //find line to highlight
            var currentLine;
            if(bFirefox)
                currentLine = parseInt(event.layerY / lineHeight);
            else
                currentLine = parseInt(event.offsetY / lineHeight);

            //highlight line
            var highlighterDiv = firstChildC(containerOfPreTag);

            highlightLine(highlighterDiv,0,preTag.offsetWidth, (lineHeight*currentLine), lineHeight);

            return 0;
        }

        function highlightLine(highlighterDiv, left, width, top, height)
        {
            highlighterDiv.style.display = "block";
            highlighterDiv.style.left = left+"px";
            highlighterDiv.style.width = width+"px";
            highlighterDiv.style.top = top+"px";
            highlighterDiv.style.height = height+"px";
        }
    </script>
</head>

<body id="page_body">
    <div id="section_content" style="overflow:auto; width:100%;">
        <table border="0" cellpadding="0" cellspacing="0" width="100%" style="line-height:1.1em">
            <tr>
                <td style="display:none;">
                    22
                </td>
                <td  style="width: 0px; vertical-align: top; border: 1px solid red">
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img   style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img   style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img   style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img   style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img   style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img  style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                    <div style='text-align: center; display:block;height: 1.1em; width: 1.1em'>
                        <img style='height: 0.8em; width: 0.8em'/>
                    </div>
                </td>

                <td style="font-size:100%;position:relative;">

                    <div style="height: 1.1em; background-color: #f7fa81; position: absolute; z-index:-1">
                    </div>

                    <PRE style="margin: 0px; border: 1px solid #ff0000" onmousemove="highlightPosition(event);">THIS IS PAGE 01. LINE 01.
THIS IS PAGE 01. LINE 02.
THIS IS PAGE 01. LINE 03.
THIS IS PAGE 01. LINE 04.
THIS IS PAGE 01. LINE 05.
THIS IS PAGE 01. LINE 06.
THIS IS PAGE 01. LINE 07.
THIS IS PAGE 01. LINE 08.
THIS IS PAGE 01. LINE 09.
THIS IS PAGE 01. LINE 10.
THIS IS PAGE 01. LINE 11.
THIS IS PAGE 01. LINE 12.
THIS IS PAGE 01. LINE 13.
THIS IS PAGE 01. LINE 14.
THIS IS PAGE 01. LINE 15.
THIS IS PAGE 01. LINE 16.
THIS IS PAGE 01. LINE 17.
THIS IS PAGE 01. LINE 18.
THIS IS PAGE 01. LINE 19.
THIS IS PAGE 01. LINE 20.
THIS IS PAGE 01. LINE 21.
THIS IS PAGE 01. LINE 22.</PRE>
                </td>
            </tr>
    开发者_开发知识库    </table>
    </div>
</body>
</html>

Lazy copypasta at request of OP:

Absolute positioning works based on the offset parent, not just the parent. The offset parent of an element e is the most immediate ancestor element of e which has position other than static (the default).

I would not recommend applying position: relative to a table cell. Use a liner div inside of the table cell, set up like this:

<td>
    <div style="position: relative; height: 100%; width: 100%;">...</div>
</td>

give the parent element position: relative.

Position relative does not work correctly on td since td is a block-like element and is already getting positioned relatively to the content around it (other tds). Rather nest another div inside td and make that div the relative and than use it to position your absolute content inside.

IE as always get's it wrong here altough display ok.