Jquery copy first column of table to each next column - html

Question

I need for mobile view som manipulation of table. My table for desktop look like:
<table>
<thead>
<tr>
<th scope="row"> </th>
<th scope="col"> </th>
<th scope="col"><strong>Special Header</strong></th>
<th scope="col"> </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>
For mobile devices I need to copy first colum to all other columns. Table should look like:
<table>
<thead>
<tr>
<th scope="row"> </th>
<th scope="col"> </th>
<th scope="row"> </th>
<th scope="col"><strong>Special Header</strong></th>
<th scope="row"> </th>
<th scope="col"> </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>
I found some Jquery, but this code only append first column at the end:
$('#addcolumn').click(function() {
$('table tr').each(function() {
$(this).append($(this).find('th:first').clone());
});
});
Can you please help to make Jquery code working for my problem, thank!
Martin

Answer 1

You can use insertAfter this will insert element in the set of matched elements after the target .So, for tbody > td you can loop through tr and get first th cloned it then you can check if td is not last-child of tr if yes just add the cloned element after that td.Now , for thead you can simply use eq(0) to get first th and then use insertAfter to add the cloned after every th where scope="col".
Demo Code :
$('#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"> </th>
<th scope="col"> </th>
<th scope="col"><strong>Special Header</strong></th>
<th scope="col"> </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>