css - 将鼠标悬停在表格上时如何突出显示表格的行和列？

Question

我想做与本例中完全相同的事情:http://jsfiddle.net/ThinkingStiff/rUhCa/ .

但是，当我尝试更改表格的背景颜色时，悬停和突出显示停止工作。

下面你可以看到我的代码:

HTML

<table>
    <tr>
        <th></th>
        <th class="col">50kg</th>
        <th class="col">55kg</th>
        <th class="col">60kg</th>
    </tr>
    <tr>
        <th class="row">160cm</th>
        <td>20</td>
        <td>21</td>
        <td>23</td>
    </tr>
</table>

CSS

table {
   border-spacing: 0;
   border-collapse: collapse;
   overflow: hidden;
   z-index: 1;
}

td, th, .row, .col {
   cursor: pointer;
   padding: 10px;
   position: relative;
}

td:hover::before,
.row:hover::before { 
   background-color: #ffa;
   content: '\00a0';  
   height: 100%;
   left: -5000px;
   position: absolute;  
   top: 0;
   width: 10000px;   
   z-index: -1;        
}

td:hover::after,
.col:hover::after { 
   background-color: #ffa;
   content: '\00a0';  
   height: 10000px;    
   left: 0;
   position: absolute;  
   top: -5000px;
   width: 100%;
   z-index: -1;        
}

Answer 1

假设这是您正在寻找的东西。您设置 z-index: -1 会在 table 具有背景颜色时隐藏背景荧光笔，因为它的 z-index 值高于负值。但你真的根本不需要它们。您应该使用 RGBA 颜色 - 它指定颜色的不透明度来进行突出显示。希望对您有所帮助!

table {
   border-spacing: 0;
   border-collapse: collapse;
   overflow: hidden;
   background-color: tomato;
}

td, th {
   padding: 10px;
   position: relative;
}

tr:hover{
   background-color: rgba(255, 255, 0, 0.5);
}

td:hover::after,th:hover::after { 
   background-color: rgba(255, 255, 0, 0.5);
   content: '\00a0';  
   height: 10000px;    
   left: 0;
   position: absolute;  
   top: -5000px;
   width: 100%;   
}

<table>
    <tr>
        <th></th>
        <th>50kg</th>
        <th>55kg</th>
        <th>60kg</th>
        <th>65kg</th>
        <th>70kg</th>
    </tr>

    <tr>
        <th class="row">160cm</th>
        <td>20</td>
        <td>21</td>
        <td>23</td>
        <td>25</td>
        <td>27</td>
    </tr>

    <tr>
        <th class="row">165cm</th>
        <td>18</td>
        <td>20</td>
        <td>22</td>
        <td>24</td>
        <td>26</td>
    </tr>

    <tr>
        <th class="row">170cm</th>
        <td>17</td>
        <td>19</td>
        <td>21</td>
        <td>23</td>
        <td>25</td>
    </tr>

    <tr>
        <th class="row">175cm</th>
        <td>16</td>
        <td>18</td>
        <td>20</td>
        <td>22</td>
        <td>24</td>
    </tr>

</table>


























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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