Allow only numbers and one dot(floating point values) in text field with keyup event

Question

I need to allow only numbers and one dot in text feild like 56.50, 67.00, 78, 98.05, .25, 0.50 etc

$('#psp').keyup(function() {
if number or dot
.............
.............
else
alert('oops...  just entered an invalid character');
});

I would be really thankful if somebody can help :)

possible duplicate of [jQuery: what is the best way to restrict "number"-only input for textboxes? (allow decimal points)](http://stackoverflow.com/questions/891696/jquery-what-is-the-best-way-to-restrict-number-only-input-for-textboxes-all) — Ram, Oct 02 '13 at 17:56

score 1 · Accepted Answer · answered Oct 02 '13 at 17:56

1

You can use this regex:

^(?=\D*\d)\d*(\.\d+)?$

answered Oct 02 '13 at 17:56

anubhava

1

You need to make the dot optional. Otherwise, they'll never be able to type the characters before the dot. – Barmar Oct 02 '13 at 17:58

Rajesh · Answer 2 · 2013-10-02T18:13:07.197

1

You can try below code which uses regex:

var num = "56.50";
if(/^(?=.)[0-9]?[0-9]?(\.[0-9][0-9]?)?$/.test(num)) {
   //
}

edited Oct 02 '13 at 18:13

answered Oct 02 '13 at 18:01

Rajesh

2 Answers2