<?php
$x = 0;
for ($x = 0; $x < $n; $x++) {
echo '<option value="' . $elementos[$x]->id . '">' . $elementos[$x]->factura . '</option>';
}
?>
</select>
<span class="input-group-btn">
<input type="submit" class="btn btn-default" type="button" name="btnSeleccion" value="Seleccionar"/>
</span>
</div>
</form>
<?php
$modificar = new Mantenimiento();
if (isset($_POST['btnSeleccion'])) {
$modificar->get($_POST['selMain2']);
}
?>
<form method="post" acction="adminMaintenance.php">
<input type="hidden" <?php
echo 'value="' . $modificar->id . '"';
?>
name="txtId">
<div class="form-group">
<label for="txtFactura">Factura</label>
<input type="text" <?php
echo 'value="' . $modificar->factura . '"';
?>
class="form-control" id="txtFactura1" name="txtFactura1" placeholder="# de Factura" required autofocus>
</div>
<div class="form-group">
