Limit the amount of number shown after a decimal place in javascript

Question

Hay, i have some floats like these

4.3455 2.768 3.67 

and i want to display them like this

4.34 2.76 3.67 

I don't want to round the number up or down, just limit the amount of numbers shown after the decimal place to 2.

Answer 1

You're looking for toFixed:

var x = 4.3455; alert(x.toFixed(2)); // alerts 4.35 -- not what you wanted! 

...but it looks like you want to truncate rather than rounding, so:

var x = 4.3455; x = Math.floor(x * 100) / 100; alert(x.toFixed(2)); // alerts 4.34 

Answer 2

As T.J answered, the toFixed method will do the appropriate rounding if necessary. It will also add trailing zeroes, which is not always ideal.

(4.55555).toFixed(2); //-> "4.56"  (4).toFixed(2); //-> "4.00" 

If you cast the return value to a number, those trailing zeroes will be dropped. This is a simpler approach than doing your own rounding or truncation math.

+parseFloat((4.55555).toFixed(2)); //-> 4.56  +parseFloat((4).toFixed(2)); //-> 4