Popup in yii2

yii\bootstrap\Modal::begin([
  'id' => 'myModal',
   'size' => 'modal-lg',
   'header' => '',
   'clientOptions' => ['backdrop' => 'static', 'keyboard' => true]
  ]);


 yii\bootstrap\Modal::end();

      Html::a(Yii::t('app', ' {modelClass}', [
       'modelClass' => 'Add More Skill',
       ]), ['my/newskill'], ['class' => 'btn btn-success',
       'data-toggle'=>"modal",
       'data-target'=>"#myModal",
       'data-title'=>"My Skill",]);

$this->registerJs("
    $('#myModal').on('show.bs.modal', function (event) {
        var button = $(event.relatedTarget)
        var modal = $(this)
        var title = button.data('title')
        var href = button.attr('href')
        modal.find('.modal-title').html(title)
        modal.find('.modal-body').html('')
        $.post(href)
            .done(function( data ) {
                modal.find('.modal-body').html(data)
            });
        })
");

In controller

return $this->renderAjax('newskill', [
            'model' => $model,
            'services' => $services,
            'subservices' => $subservices,
            'basicinfo' => $basicinfo,
        ]);