Only allow numbers, decimals, negative

Question

I have this code that only permits numbers to be entered in an input field on keypress()

if (e.which != 8 && e.which != 0 && (e.which < 48 ||          


        

Answer 1

This is a solution, but I recommend to use mask plugin, for example: jQuery-Mask-Plugin

$("#id").keypress(function(e){
  if (e.which != 46 && e.which != 45 && e.which != 46 &&
      !(e.which >= 48 && e.which <= 57)) {
    return false;
  }
});