html: hover table column [duplicate]

Question

How can I change the background column of an html table column when the mouse is over it?

Preferably with css only.

Answer 1

This can be done using CSS with no Javascript.

I used the ::after pseudo-element to do the highlighting. z-index keeps the highlighting below the <tds> in case you need to handle click events. Using a massive height allows it to cover the whole column. overflow: hidden on the <table> hides the highlight overflow.

Demo: http://jsfiddle.net/ThinkingStiff/2XeYe/

Output:

CSS:

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

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

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

HTML:

<table>
    <tr>
        <th></th><th>50kg</th><th>55kg</th><th>60kg</th><th>65kg</th><th>70kg</th>
    </tr>
    <tr>
        <th>160cm</th><td>20</td><td>21</td><td>23</td><td>25</td><td>27</td>
    </tr>
    <tr>
        <th>165cm</th><td>18</td><td>20</td><td>22</td><td>24</td><td>26</td>
    </tr>
    <tr>
        <th>170cm</th><td>17</td><td>19</td><td>21</td><td>23</td><td>25</td>
    </tr>
    <tr>
        <th>175cm</th><td>16</td><td>18</td><td>20</td><td>22</td><td>24</td>
    </tr>
</table>

Answer 2

I have a more simple solution (Live example: http://jsfiddle.net/q3HHt/1/)

HTML:

<table>
    <tr>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
  </tr>
    <tr>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
        <td>&nbsp;</td>
  </tr>
</table>

CSS:

table, td {
    border: 1px solid black;
}

td {
    width: 40px;  
    height: 40px;
}

.highlighted {
    background-color: #348A75;
}

jQuery:

$('td').hover(function() {
    var t = parseInt($(this).index()) + 1;
    $('td:nth-child(' + t + ')').addClass('highlighted');
},
function() {
    var t = parseInt($(this).index()) + 1;
    $('td:nth-child(' + t + ')').removeClass('highlighted');
});

Live example: http://jsfiddle.net/q3HHt/1/

Answer 3

Only works for cells or rows, sorry. e.g.

td {
  background-color: blue;
}

td:hover {
  background-color: red;
}

There are JavaScript solutions available but nothing in CSS right now will do what you want because of the limitations of selectors.

td  /* all cells */
{ 
  background-color: blue;
}

tr /* all rows */
{
  background-color: pink;
}

/* nothing for all columns */

Answer 4

Just to extends Muhammads answer (https://stackoverflow.com/a/11828637/1316280), if you want to highlight the cols only in the actual table, change the jquery-code-part to: this jsfiddle is specific for only the actual table

jQuery

$('td').hover(function() {
    var t = parseInt($(this).index()) + 1;
    $(this).parents('table').find('td:nth-child(' + t + ')').addClass('highlighted');
},
function() {
    var t = parseInt($(this).index()) + 1;
    $(this).parents('table').find('td:nth-child(' + t + ')').removeClass('highlighted');
});

jsFiddle: http://jsfiddle.net/q3HHt/123/