Problems while rendering gridview

Hi everybody. I’m using Yii2 advanced, Kartik grid/export menu extensiones, Bootstrap 4 and AdminLTE3 theme. Everything renders properly but when I click on an export menu option nothing happens. If I check all the js libraries included, export and dialog library are missing. I’m quite sure is related to the AJAX call and the way I return data from my controller. When I use normal “render” method, everything works properly.

Here is my gridview code

echo GridView::widget([
'dataProvider' => $dataProvider,
'headerRowOptions' => ['class' => 'kartik-sheet-style'],
'pjax' => true,
'toolbar' => $toolbar,
'toggleDataOptions' => [   
    'all' => [
        'label' => Yii::t('kvgrid', 'Todo'),
        'class' => 'btn btn-secondary',
        'title' => 'Mostrar todos los resultados'
    ],
    'page' => [
        //'icon' => 'resize-small',
        'label' => Yii::t('kvgrid', 'Pagina'),
        'class' => 'btn btn-secondary',
        'title' => 'Mostrar la primera pagina'
    ],
],
'columns' => $gridColumns,
'showPageSummary' => false,
'summary' => ($dataProvider->getPagination()!=null)?"Mostrando <strong>{begin}</strong> - <strong>{end}</strong> de <strong>{totalCount}</strong> resultados.":$resultados,          
'panel' => [
    'after'=> $afterGrid, 
],
'responsive'=>true,
'options' => ['class' => 'grilla'],
'hover'=>true,
'export' => [
   'label' => "Exportar",
   'header' => '<li role="presentation" class="dropdown-header">Exportar informacion</li>',
],  
'exportConfig' => [         
    GridView::EXCEL => true,
    GridView::CSV => true,        
],
'emptyText'=>'No se encontraron resultados.']);

Here is my controller code

public function actionIndex()
{

	$model = $this->createFormModel();

	if ($model->load(Yii::$app->request->post()) && $model->validate()) {
		if (Yii::$app->request->isAjax) {

			$model->load(Yii::$app->request->post());

			Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;

			$POST_VARIABLE = Yii::$app->request->post('DynamicModel');

			$facultad = $POST_VARIABLE['facultad'];
			$titulos = $POST_VARIABLE['titulo'];

			$data = Egresados::getFilterData($facultad, $titulos);

			$seriesRows = $data['seriesRows'];
			$dataProvider = $data['provider'];

			$gridColumns = $this->buildColumnsGrid();
			$table = \GridFormat::buildGrid($dataProvider, $gridColumns);

			return [
				'seriesRows' => $seriesRows,
				'table' => $table,

			];
		}
	} else {

		return $this->render('index', [
			'model' => $model,
		]);
	}
}

My js code

function renderData(form) {
  $.ajax({
    url: form.attr("action"),
    type: "post",
    dataType: "json",
    data: form.serialize(),
    success: function (res) {
      let chartDumbbellRef = document.getElementById("chart-dumbbell");
      $("#table").html(res.table);
    },
    error: function (xhr, ajaxOptions, thrownError) {
      $("#error").closest(".card").removeClass("hidden");
    },
  });
}

$("#form").on("beforeSubmit", function () {
  renderData($(this));
  return false;
});