php - 向 CSS 表格添加样式

Question

我正在将数据库中的数据回显到 <table> 中，但是我试图在每个输出下添加一条渐变线，以显示在每个 <tr> 之间输出行。但我无法在 <tr> 上获得正确的 CSS .

我已经成功地将我想要的设计放在了 <hr> 上这里:http://jsfiddle.net/ghrw3k8e/ .

但我希望它在我的表格行(而不是列)之间。

我的 PHP 输出数据:

echo " <tr> 
<td align='center'>".$1." </td> 
<td align='center'>".$2."</td> 
<td align='center'>".$3."</td>
 </tr> ";

Answer 1

只需使用 pseudo-elements .你必须把那个“边框”放在一个 <td> 上每个 <tr> , 所以它的宽度应该等于 100 × number_of_columns %如果它们都一样width :

table {
  width: 100%;
  border-collapse: collapse; 
}

td {
  position:relative;   
  width: 33.333333%;
  border: 1px solid transparent;
  text-align:center;
}

tr:not(:last-child) > td:first-child::after {
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  height: 1px;
  width:300%;
  background-image: -webkit-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:    -moz-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:     -ms-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:      -o-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
}

<table>
  <tr><td>A</td><td>B</td><td>C</td></tr>
  <tr><td>D</td><td>E</td><td>F</td></tr>
  <tr><td>G</td><td>H</td><td>I</td></tr>
</table>

尽管将它放在 <tr> 上似乎更合乎逻辑。 ，它不会正确定位，正如您可以从规范中看到的那样:http://www.w3.org/TR/CSS21/visuren.html#propdef-position

The effect of 'position:relative' on table-row-group, table-header-group, table-footer-group, table-row, table-column-group, table-column, table-cell, and table-caption elements is undefined.

这是不正确的代码。你可以看到 ::after元素位于页面的最底部:

table {
  width: 100%;
  border-collapse: collapse;
}


tr{
  position:relative;    
}

td {
  width: 33.333333%;
  border: 1px solid transparent;
  text-align: center;
}


tr:not(:last-child)::after {
  content:"";
  position:absolute;
  bottom:-1px;
  left:0;
  height: 1px;
  width:300%;
  background-image: -webkit-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:    -moz-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:     -ms-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
  background-image:      -o-linear-gradient(left, rgba(0,0,0,0), rgba(176,0,0,.8), rgba(0,0,0,0));
}

<table>
  <tr><td>A</td><td>B</td><td>C</td></tr>
  <tr><td>D</td><td>E</td><td>F</td></tr>
  <tr><td>G</td><td>H</td><td>I</td></tr>
</table>