Multiply variable to one decimal place

Question

My employer wishes for a textbox to convert feet to metres to one decimal place, however, I am unfamiliar with Javascript and only know the bare basics for HTML purposes. My current code converts it correctly, but it is not to one decimal place.. Any suggestions?

Code:

    <script type="text/javascript">
<!--
function validate() {
var ft = document.getElementById('LengthFt');
var res=0.3048*ft.value;
var mtrs = document.getElementById('LengthMtrs');
mtrs.value = res;
}
//-->
</script>

possible duplicate: http://stackoverflow.com/questions/7342957/how-do-you-round-to-1-decimal-place-in-javascript — TimCodes.NET, Feb 27 '12 at 19:04
Tip: we haven't needed to hide scripts with comments (!--) since 1996. — Diodeus - James MacFarlane, Feb 27 '12 at 19:05

score 1 · Accepted Answer · answered Feb 27 '12 at 19:04

It looks like you've done the conversion. After that, all you need to do is format the number properly.

The toFixed method can be used to format to a fixed number of decimal places.

Replacing

mtrs.value = res;

with

mtrs.value = res.toFixed(1);

should leave the right number in the LengthMtrs input accurate to the closest decimeter.

Multiply variable to one decimal place

1 Answers1