How do I validate numbers in Javascript?

Question

How to validate a numeric numbers?

Look here - this has the answer stackoverflow.com/questions/1303646/… — Romain Hippeau
– Romain Hippeau, Commented Apr 18, 2010 at 2:54
do you mean the datatype is number or string type number? var strNum = '123'; — Sungguk Lim
– Sungguk Lim, Commented Apr 18, 2010 at 4:33

MiffTheFox · Accepted Answer · 2010-04-18 02:51:47Z

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, 2010 at 2:51

MiffTheFox

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1 Comment

Just for the record, if you want to allow commas or dollar signs just add them after the 9 in the brackets.

Community · Accepted Answer · 2017-05-23 12:05:42Z

1

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

CommunityBot

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answered Apr 18, 2010 at 3:45

Roman

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