JSFiddle - React, Tailwind, and code Playground

by hunter

HTML

<table id="tlbQueryConf">
    <tr>
        <td>            
            <select class="ddlFields">
                <option value="1">Prueba</option>
                <option value="2">cantidad de fallas</option>
                <option value="3">nÂş</option>
                <option value="4">Ciudad</option>
                <option value="5">COID</option>
                <option value="6">COID_DESC</option>
                <option value="7">Creado_EN</option>
                <option value="8">DSLAM PROVEEDOR</option>
            </select>
        </td>
    </tr>
</table>

JavaScript

var id = 1;
var field = 7;

$("#tlbQueryConf tr:last").append(
$('<td>', {
    html: $(".ddlFields").clone().attr({ 'id': 'ddlFields-' + id, 'class': ''}).val(field)
}));