How do I validate numbers in Javascript?

Question

How to validate a numeric numbers?

Answer 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!

Answer 2

Look here - this has the answer

http://stackoverflow.com/questions/1303646/check-variable-whether-is-number-or-string-in-javascript

Answer 3

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