How can I add new <tr> after a clicked <tr>. On click of this <tr> and remove now created when click other <tr> (with repeat 1st scenario) by jQuery?
I tried like this, but it does not work:
$("#test_table tr").click(function() {
$(this).prev().remove();
$(this).closest('tr').append('<tr><td>2.2</td></tr>');
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="test_table">
<tr>
<td>1</td>
</tr>
<tr>
<td>2</td>
</tr>
<tr>
<td>3</td>
</tr>
</table>Given your goal it seems that you want to replace the current tr with the new HTML snippet. To do that you just need to call after() to insert the new HTML, then remove() to clear the original tr:
$("#test_table tr").click(function() {
$(this).after('<tr><td>2.2</td></tr>').remove();
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="test_table">
<tr>
<td>1</td>
</tr>
<tr>
<td>2</td>
</tr>
<tr>
<td>3</td>
</tr>
</table>However, as the only effect of this is to change the text within the td, you can just call text() instead:
$("#test_table tr").click(function() {
$(this).find('td').text('2.2');
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="test_table">
<tr>
<td>1</td>
</tr>
<tr>
<td>2</td>
</tr>
<tr>
<td>3</td>
</tr>
</table>