round variable and store in internal variable

Question

I am calculating a score (stored in D221_13) and want to display it to participants without decimal places.
Therefore, I created a javascript using Math.round() and I created the internal variable D221_14 to store my rounded score in.

However, when I try to display the score it says "NaN".

This is my code:

<script type="text/javascript">
<!--
 
var score = document.getElementById("D221_14");

score.value = Math.round("D221_13");
 
// -->
</script>

What do I need to change?

Answer 1

It may be easer to do that in PHP:

$val = round(value('D221_13'));
put('D221_14', $val);

If you like to do that in JavaScript, you will have to drag the question D221 (at least with the variables 13 und 14) on the page above the JavaScript. And, of course, you need to read from the internal variable:

var scoreA = document.getElementById("D221_13");
var scoreB = document.getElementById("D221_14");
scoreB.value = Math.round(parseFloat(scoreA.value));

but ... better use the PHP code, no need to move that from the server to the browser.