jquery - 如何在选择元素的 foreach 循环中获取数据属性？

Question

<tr class="font-titlerow">    
<td class="fontname-col">
    <select>
    <option data-fontfamily="Abel" value="1">Abel</option>
    <option data-fontfamily="Arial" value="2">Arial</option>
    <option data-fontfamily="Arial+Black" value="3">Arial Black</option>
    </select>
</td>
</tr>

<tr class="font-titlerow">    
<td class="fontname-col">
    <select>
    <option data-fontfamily="Abel" value="1">Abel</option>
    <option data-fontfamily="Arial" value="2">Arial</option>
    <option data-fontfamily="Arial+Black" value="3">Arial Black</option>
    </select>
</td>
</tr>

如何在 jQuery 中循环选择并获取 data-fontfamily？

$("tr.font-titlerow").each(function(index) {       
    var drow = $(this);

    var fontselect =drow.find("td.fontname-col").find("select");
    var fontname = fontselect.val(); //This gives the value... (1,2 or 3 in example)
    var fontfamily = fontselect.attr('data-fontfamily'); //Does not work (obviously) 

}

Answer 1

您需要:selected selector ，因为自定义属性 fontfamily 是在 option 元素上定义的，而不是在 select 元素上定义的。

var fontfamily = fontselect.find('option:selected').data('fontfamily');

$("tr.font-titlerow").each(function(index) {
  var drow = $(this);

  var fontselect = drow.find("td.fontname-col").find("select");
  var fontname = fontselect.val(); //This gives the value... (1,2 or 3 in example)
  var fontfamily = fontselect.find(':selected').data('fontfamily');
  snippet.log(fontfamily)

});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Provides the `snippet` object, see http://meta.stackexchange.com/a/242144/134069 -->
<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>

<table>
  <tr class="font-titlerow">
    <td class="fontname-col">
      <select>
        <option data-fontfamily="Abel" value="1">Abel</option>
        <option data-fontfamily="Arial" value="2">Arial</option>
        <option data-fontfamily="Arial+Black" value="3">Arial Black</option>
      </select>
    </td>
  </tr>
</table>