How to execute some js code after click on exposed filter AJAX enabled submit?
You can use the ajaxStart() function, to execute something before  Ajax request begins:

 Drupal.behaviors.&lt;themename/modulename&gt; = {
  attach: function (context, settings) {
    $('#edit-submit-phrases').on('click', function() {
      $( document ).ajaxStart(function() {
        alert('check'); 
      });
    });
  }
};