I have the following code which runs but not the way it should. The user has to select a value from the drop-down list then, depending on the value selected, an area will be computed using the data in the `input` fields. The `switch` works fine because I can see the alert but the area returned (`aria1`/`aria2`) is shown as NaN.

FIDDLE HERE: <https://jsfiddle.net/aLgvwq3r/>

Select "Forma 1" and insert some values. Instead of NaN I should be getting a value for that area after I press the button. 

It looks like it is not values from the inputs. What should I do?

```
function arie1() {
  var lungC = parseFloat(document.getElementById('lungC').value);
  var latC = parseFloat(document.getElementById('latC').value);
  var hC = parseFloat(document.getElementById('hC').value);
  var hBaza = parseFloat(document.getElementById('hTotal').value);
  var latBaza = parseFloat(document.getElementById('latBaza').value);
  var aria1 = 2 * lungC * latC + 2 * lungC * hTotal + 2 * latBaza * (hC + hTotal) + 2 * 0.5 * lungC + 0.5 * latBaza + 5; //se vor lua 5m2 de rezerva si se va mentiona pe site sa se mai adauge o marja de eroare
  document.getElementById('mpv').innerHTML = aria1;
  document.getElementById('mp').style.display = 'block';

}

function arie2() {
  var lungC = parseFloat(document.getElementById('lungC').value);
  var latC = parseFloat(document.getElementById('latC').value);
  var hC = parseFloat(document.getElementById('hC').value);
  var hBaza = parseFloat(document.getElementById('hTotal').value);
  var latBaza = parseFloat(document.getElementById('latBaza').value);
  aria2 = parseFloat(lungC * latC + 2 * lungC * hTotal + 2 * latBaza * (hC + hTotal) + 2 * 0.5 * lungC + 0.5 * latBaza + 5); //se vor lua 5m2 de rezerva si se va mentiona pe site sa se mai adauge o marja de eroare
  document.getElementById('mpv').innerHTML = aria2;
  document.getElementById('mp').style.display = 'block';
}

function switcherForma() {
  switch (parseInt(document.getElementById('select-forma').value, 10)) {
    case 1:
      alert("Ati ales Forma 1");
      document.getElementById('f1').style.color = "red";
      document.getElementById('calculeaza').addEventListener('click', arie1);
      break;

    case 2:

      break;

    case 3:

      break;
  }
}

```