HTML text input allow only numeric input

Question

Is there a quick way to set an HTML text input () to only allow numeric keystrokes (plus \'.\')?

Answer 1

I opted to use a combination of the two answers mentioned here i.e.

and

function isNumberKey(evt){
    var charCode = (evt.which) ? evt.which : evt.keyCode
    return !(charCode > 31 && (charCode < 48 || charCode > 57));
}