How to properly reload grid

[BenasPaulikas]

    $(document).on('pjax:beforeSend', function(event, xhr, settings) {
      settings.data = $('[name^=RequestSearch]').serialize();
    });
    $.pjax.reload("#dynagrid-1-pjax", {type: "POST"})

But in console I'm getting kv-dynagrid.js:127 Uncaught ReferenceError: initSelect2Loading is not defined

and many spinners :dancer:

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