number-to-currency.js

Site.util.number_to_currency = function num2money(n_value) {
  // validate input
  if (isNaN(Number(n_value))) return 'ERROR';

  // save the sign
  var b_negative = Boolean(n_value < 0);
  n_value = Math.abs(n_value);

  // round to 1/100 precision, add ending zeroes if needed
  var s_result = String(Math.round(n_value * 1e2) % 1e2 + '00').substring(0, 2);

  // separate all orders
  var b_first = true;
  var s_subresult;
  while (n_value >= 1) {
    s_subresult = (n_value >= 1e3 ? '00': '') + Math.floor(n_value % 1e3);
    s_result = s_subresult.slice( - 3) + (b_first ? '.': ',') + s_result;
    b_first = false;
    n_value = n_value / 1e3;
  }
  // add at least one integer digit
  if (b_first) s_result = '0.' + s_result;

  // apply formatting and return
  return b_negative ? '($' + s_result + ')': '$' + s_result;
}