How I can auto update cart page after putting quantity

[padmdillo]

I would like to reload page once user change the quantity at cart page. 

[Fayyaz_Ahmed]

$('.qty-input').on('change', function(){
                var prev = $(this).data('val');
                var current = $(this).val();
                  setTimeout(function() {
                      if (prev != current){
                        $( "#cart_update" ).trigger( "click" );
                      }
                  }, 500);
            });

[padmdillo]

Thank you Fayyaz for taking time to answer my question. Which file I should add this code. 

[Fayyaz_Ahmed · Accepted solution]

Please go to sections and then go to cart-template.liquid and add the this code in very bottom. Wrap with Script tags

[Jordan_CS]

I can't get this to work buddy. Any suggestions for me to try? Cheers