Creating a working quantity selector

Design help General
1

Does someone know where the mistake is?
The custom code is this:

<script>

$('.input-number-increment').click(function() {

  var $input = $(this).parents('.input-number-group').find('.input-number');

  var val = parseInt($input.val(), 10);

  $input.val(val + 1);

});



$('.input-number-decrement').click(function() {

  var $input = $(this).parents('.input-number-group').find('.input-number');

  var val = parseInt($input.val(), 10);

  $input.val(Math.max(val - 1, 1));

})



</script>

It should work as follows: If I hit the plus the one gets added to the quantity, if i hit minus it gets reduced

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