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SearchSpring.Catalog.init({
  // ...
  afterResultsChange: function() {
  	$(document).trigger('Miva.SearchSpring.AfterResultsChange');
  }
  // ...
});

$(document).on('Miva.SearchSpring.AfterResultsChange', function(){
	// console.log('Miva.SearchSpring.AfterResultsChange');
	// Do something 
});