How do I validate numbers in Javascript?

Question

How to validate a numeric numbers?

do you mean the datatype is number or string type number? var strNum = '123'; — Sungguk Lim, Apr 18 '10 at 04:33
Look here - this has the answer http://stackoverflow.com/questions/1303646/check-variable-whether-is-number-or-string-in-javascript — Romain Hippeau, Apr 18 '10 at 02:54

score 1 · Answer 1 · answered Apr 18 '10 at 02:51

1

var number_string = document.getElementById("my_input").value;
is_valid = /^[0-9]+$/.test(number_string);

Don't forget to server-side validate as well!

answered Apr 18 '10 at 02:51

MiffTheFox

Just for the record, if you want to allow commas or dollar signs just add them after the 9 in the brackets. – Michael Shnitzer Apr 18 '10 at 02:54

score 1 · Answer 2 · edited May 23 '17 at 12:05

1

There's also a pretty nice implementation of isNumeric here.

edited May 23 '17 at 12:05

Community

answered Apr 18 '10 at 03:45

Roman

2 Answers2