Comments on: JavaScript round float to n decimal points

By: Nabil

Nabil — Wed, 06 Apr 2011 17:20:30 +0000

This is very clean, if val is not a number the function will return NaN (Not a Number)

Thanks Chat!

Chat — Wed, 06 Apr 2011 16:24:34 +0000

make it simpler
function round(val, prec)
{
return parseFloat(parseFloat(val).toFixed(prec));
}

Dmitry — Mon, 16 Aug 2010 03:18:05 +0000

It would be better to use prototyping here. Newer browsers support toFixed() function. Older don’t.
So here’s the way to do it:

if (!Number.toFixed) {
Number.prototype.toFixed=function(x) {
var temp=this;
temp=Math.round(temp*Math.pow(10,x))/Math.pow(10,x);
return temp;
}}

example:

f=123.23453

window.alert(f.toFixed(2));