function dameEquiposArea(Request $r)
{
$id_area = $r->input('id_area');
$labArea = LabArea::find($id_area);
$items = InvItem::where('id_area', $id_area)->get();
$cadena = "";
foreach ($items as $item => $i) {
if ($i->id_item_principal == null) {
$cadena = $cadena . "<option>" . $i->codigo_lab . "</option> ";
}
}
return $cadena;
}
