How to load data on scroll Yii2 (kop/yii2-scroll-pager )?

Question

Yii

echo \yii\widgets\ListView::widget([
                                'dataProvider' => $dataProvider,
                                'itemOptions' => ['class' => 'item'],
                                'itemView' => '_itemNew',
                                'summary' => false,
                                'pager' => ['class' => \kop\y2sp\ScrollPager::className(), 'eventOnScroll' => 'loadPager'],
                            ]);

did the same in loadPager

function loadPager() {
    $('.ias-trigger a').trigger('click');
}

when scrolling, each page is loaded twice, what's wrong?