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center table vertically **URGENT 500 POINTS**

Posted on 2006-06-12
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Last Modified: 2012-05-05
I have a table that should be centered vertically but it always shows up right below my top table. How can I fix it.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>The Specialists Pricetag Generator</title>
<link href="/css/stylesheet.css" rel="stylesheet" type="text/css" />
</head>

<body>
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
      <tr>
            <td valign="top">
                  <table width="100%" height="10px" border="0" cellpadding="8" cellspacing="0">
                        <tr>
                              <td bgcolor="#003A69" class="menu"><div align="left">Test1</div></td>
                              <td bgcolor="#003A69" class="menu"><div align="center">Test2</div></td>
                              <td bgcolor="#003A69" class="menu"><div align="right">Test3</div></td>
                        </tr>
                  </table>
            </td>
      </tr>
      <tr>
            <td align="center" valign="middle" height="100%">
                  <form action="/?action=tagSheet" method="post" name="choose_tag_type">
                        <table width="400px" border="1px" bordercolor="#CCCCCC" cellpadding="0" cellspacing="0">
                              <tr>
                                    <td height="30px" colspan="2">
                                          The Specialists Pricetag Generator
                                    </td>
                              </tr>
                              <tr>
                                    <td align="left">Tag Type:</td>
                                    <td align="left">
                                          <select name="tag_type" onchange="choose_tag_type.submit()">
                                                <option value="">--------------------</option>
                                                <option value="1">Normal Tag</option>
                                                <option value="2">Head Unit Tag</option>
                                          </select>
                                    </td>
                              </tr>
                        </table>
                  </form>
            </td>
      </tr>
</table>
</body>
</html>


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Question by:TheMaximumWeasel
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7 Comments
 
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Accepted Solution

by:
bowen18 earned 500 total points
ID: 16888959
Your <DOCTYPE> tag is keeping it from working, as the way you've used relative height is invalid for xhtml.

Remove the following line:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

And change this line:
<html xmlns="http://www.w3.org/1999/xhtml">

to:
<html>

This page has a pretty good explanation of what's going on:
http://www.apptools.com/examples/tableheight.php
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Author Comment

by:TheMaximumWeasel
ID: 16889181
Thanks

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Author Comment

by:TheMaximumWeasel
ID: 16889190
I knew it was invalid XHTML but I didn't realized that the browser ignores invalid stuff because it used to work then I would apply height with CSS.

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LVL 30

Expert Comment

by:GrandSchtroumpf
ID: 16889644
>  Remove the following line:
>  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

What???  Your page MUST have a docytpe!!!

The dirty trick is to use this CSS (as in the link posted by bowen18):

   html,body{
      height:100%;
   }

But the only 100% correct solution is not to use any vertical centering...  and use some margin/padding instead.
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Expert Comment

by:bowen18
ID: 16890175
> What???  Your page MUST have a docytpe!!!

A bit dramatic, eh?  To be valid and proper, yes, the page should have a doctype.  However, in this example, the page will display properly without it.
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Expert Comment

by:GrandSchtroumpf
ID: 16890350
> A bit dramatic, eh?
Yes, a dramatic response to a dramatic advice :)
You gave the link to an article that explains the issue.
That's because relative heights are treated as "auto" when the container does not have an explicit height and that its "position" is not "absolute".
Using the "html,body{ height:100%; }" trick is not ideal, but it's much better than using quirks mode + invalid code.
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Author Comment

by:TheMaximumWeasel
ID: 16915018
css didn't work either I just decided to not center it vertically.

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