html - Jquery 将表的第一列复制到下一列

Question

我需要对表进行移动查看和操作。我的桌面表格如下:

    <table>
                <thead>
                    <tr>
                        <th scope="row">&nbsp;</th>
                        <th scope="col">&nbsp;</th>
                        <th scope="col"><strong>Special Header</strong></th>
                        <th scope="col">&nbsp;</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <th scope="row"><strong>First</strong></th>
                        <td><strong>Second</strong></td>
                        <td><strong>Third</strong></td>
                        <td><strong>fourth</strong></td>
                    </tr>
                    <tr>
                        <th scope="row"><strong>Text</strong></th>
                        <td>Text</td>
                        <td>Text</td>
                        <td>Text</td>
                    </tr>
                </tbody>
            </table>

对于移动设备，我需要将第一个列复制到所有其他列。表格应如下所示:

<table>
                <thead>
                    <tr>
                        <th scope="row">&nbsp;</th>
                        <th scope="col">&nbsp;</th>
                        <th scope="row">&nbsp;</th>
                        <th scope="col"><strong>Special Header</strong></th>
                        <th scope="row">&nbsp;</th>
                        <th scope="col">&nbsp;</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <th scope="row"><strong>First</strong></th>
                        <td><strong>Second</strong></td>
                        <th scope="row"><strong>First</strong></th>
                        <td><strong>Third</strong></td>
                        <th scope="row"><strong>First</strong></th>
                        <td><strong>fourth</strong></td>
                    </tr>
                    <tr>
                        <th scope="row"><strong>Text</strong></th>
                        <td>Text</td>
                        <th scope="row"><strong>Text</strong></th>
                        <td>Text</td>
                        <th scope="row"><strong>Text</strong></th>
                        <td>Text</td>
                    </tr>
                </tbody>
            </table>

我找到了一些 Jquery，但是这段代码只在末尾附加了第一列:

$('#addcolumn').click(function() {
    
    $('table tr').each(function() {
      $(this).append($(this).find('th:first').clone());
    });

  });

能否请您帮助使 Jquery 代码能够解决我的问题，谢谢!马丁

Answer 1

您可以使用 insertAfter这将在目标后的匹配元素集中插入元素。因此，对于 tbody > td你可以遍历 tr 并得到 first克隆它然后你可以检查是否td不是 last-child of tr 如果是，则在之后添加克隆元素 td .现在，对于thead你可以简单地使用 eq(0)获得第一个th然后使用 insertAfter在每个 scope="col" 之后添加克隆.

演示代码:

$('#addcolumn').click(function() {
  ///loop through tds
  $('tbody  td').each(function() {
    //get th
    var clone = $(this).closest("tr").find('th:first').clone()
    //if td is not last
    if (!$(this).is(':last-child')) {
      $(clone).insertAfter(this); //insert the cloned th
    }
  });
  //get the header first th
  var headers = $("table").find("thead th:eq(0)").clone();
  //insert cloned to th where scope=col and not last child
  $(headers).insertAfter("thead th[scope=col]:not(:last-child)");


});
$('#normal').click(function() {
//remove th not first child from thead and tbody
$("thead th[scope=row]:not(:first-child)").remove();
$("tbody th[scope=row]:not(:first-child)").remove();
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
  <thead>
    <tr>
      <th scope="row">&nbsp;</th>
      <th scope="col">&nbsp;</th>
      <th scope="col"><strong>Special Header</strong></th>
      <th scope="col">&nbsp;</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row"><strong>First</strong></th>
      <td><strong>Second</strong></td>
      <td><strong>Third</strong></td>
      <td><strong>fourth</strong></td>
    </tr>
    <tr>
      <th scope="row"><strong>Text</strong></th>
      <td>Text</td>
      <td>Text</td>
      <td>Text</td>
    </tr>
  </tbody>
</table>


<button id="addcolumn">Add</button>
<button id="normal">Reset</button>