Allow Only Numbers (0-9) in Input Fields with jQuery

  $(".numbersOnly").keydown(function(e){
    var key = e.charCode || e.keyCode || 0;
    // allow backspace, tab, delete, arrows, numbers and keypad numbers ONLY
    return (
        key == 8 || 
        key == 9 ||
        key == 46 ||
        (key >= 37 && key <= 40) ||
        (key >= 48 && key <= 57) ||
        (key >= 96 && key <= 105));
  });