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Feb 20th, 2020
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  1. Number.isInteger = Number.isInteger || function(value) {
  2.   return typeof value === 'number' && Number.isFinite(value) && !(value % 1);
  3. };
  4.  
  5. $(document).on('click','.plusminus-btn',function(e) {
  6.     var $input = $(this).siblings('input');
  7.     var val = +$input.val();
  8.     if ($(this).hasClass('minus')) {
  9.         if (val < 2) return false;
  10.         val--;
  11.     } else {
  12.         val++;
  13.     }
  14.     $input.val(val);
  15. });
  16.  
  17. $(document).on('blur','.plusminus-input',function(e) {
  18.     var n = +$(this).val();
  19.     if (!Number.isInteger(n) || n < 1) {
  20.         $(this).val(1);
  21.         n = 1;
  22.     }
  23. });
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