Only Accept Numbers with Decimal in a Input Using Javascript?

Question

How to only allow decimals numbers in a Input Ej:

12.00,
12.44,
00.34

Many Thanks

Do you mean at validation (of some kind) or do you mean not even letting the key presses register in the input? — Corbin
– Corbin, Commented Sep 7, 2011 at 22:32
Yes!, I want Validate an input for only set numbers with decimals :), sorry for my bad english — blackriderws
– blackriderws, Commented Sep 7, 2011 at 22:33
You'll want to look into attaching a handler for an onkeydown event. You'll need to check in the event object to see what the actual key pressed was, and then you can either return false or true to allow the event to continue or not. — Corbin
– Corbin, Commented Sep 7, 2011 at 22:44

Oscar Godson · Accepted Answer · 2011-09-07 22:34:05Z

1

Here:

var isFloat = function(n) {
 return n % 1 !== 0;
}

So you could do:

if(isFloat(n)){
  //Do something
}
else{
  //Give an error
}

answered Sep 7, 2011 at 22:34

Oscar Godson

32.9k42 gold badges129 silver badges207 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1