making a calculator

thx both of u, really appreciating this, thx again

oh n sory 1 last request in urs mwinter :P

can you put the price before tax and after tax to show, jsut like tweys? thanks man

Code:

---

<form action="">
  <label>Item price: <input type="text" name="price"></label>
  <label>Shipping charge: <input type="text" name="shipping"></label>
  <label>Subtotal: <input type="text" name="subtotal"></label>
  <label>Tax group:
  <select name="tax" size="1">
    <!-- VAT:  <option value="0.175">...</option> -->
  </select></label>
  <label>Total: <input type="text" name="total"></label>
  <input type="button" value="Calculate" onclick="calculate(this.form);">
</form>

---

Code:

---

function calculate(f) {
  var e = f.elements,
      p = e.price.value,
      s = e.shipping.value,
      t = e.tax,
      m = ['The following fields are invalid:\n'];

  if(!Number.isReal(p)) {m.push('Item price');}
  if(!Number.isReal(s)) {m.push('Shipping charge');}
  if(-1 == t.selectedIndex) {m.push('Tax group');}
  if(1 != m.length) {
    alert(m.join('\n'));
    return false;
  }
  e.total.value = ((+p + (+s)) * (1 + (+t.options[t.selectedIndex].value))
                              * 100).toCurrency('$');
  e.subtotal.value = (+p + (+s)).toCurrency('$');
}

if('function' != typeof Array.prototype.push) {
  Array.prototype.push = function(v) {
    var i = this.length >>> 0,
        j = 0,
        n = arguments.length;

    while(n > j) {this[i++] = arguments[j++];}
    return (this.length = i);
  };
}
Number.prototype.toCurrency = function(c, t, d) {
  var n = +this,
      s = (0 > n) ? '-' : '',
      m = String(Math.round(Math.abs(n))),
      i = '',
      j, f;
      c = c || '';
      t = t || '';
      d = d || '.';

  while (m.length < 3) {m = '0' + m;}
  f = m.substring((j = m.length - 2));
  while (j > 3) {i = t + m.substring(j - 3, j) + i; j -= 3;}
  i = m.substring(0, j) + i;
  return s + c + i + d + f;
};
Number.isReal = function(s) {
  return /^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$/.test(s);
};

---

Haven't got a clue what the difference between (s) and (+s) is, I just included it because Mike did :p

thx bro

Im setting up a website that needs to have a calculator similiar to this link:
https://www.101incorporate.com/incorporation-order.htm

The user need to be able to click on things and the calculator need to change according to the different packages and items they select. And the calculator will total it out.

Can anyone help me? Please. Thanks! :)

Perhaps DD can help move this post. But this question really belongs in the requesting script thread

I know this can be done in PHP and JS, it just depends on what you want/need/are able to use