JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-sm-8">
<table>
<tr data-leaveTypeId="2"></tr>
</table>
   <select name="leave_type" class="select2-container form-control" id="leave_type_edit">
      <option value="0">---</option>
      <option value="1">Test</option>
       <option value="2">Test 2</option>
    </select>
</div>

JavaScript

var leaveTypeId = 2; // for example
$('#leave_type_edit').find('option[value="'+leaveTypeId+'"]').attr('selected','selected');