Thousand separator with decimal on typing

number-decimal.js

var element = '#numberFormattedWithDecimal';
$(element).keyup(function(event) {
  
  /**
   * Regular Expression.
   *  ref.
   *    https://regex101.com
   *    
   * @type {RegExp}
   */
  var regex = /([0-9])([0-9]{2})$/;
  var rgex  = /\D/g;
  var regx  = /\B(?=(\d{3})+(?!\d)\.?)/g; // 

  // skip for arrow keys
  if(event.which >= 37 && event.which <= 40){
      event.preventDefault();
  }

  $(this).val(function(index, value) {
      return value
      .replace(rgex, "")
      .replace(regex, '$1.$2')  
      .replace(regx, ",");
      });
  });