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

 $('.DecimalNumberWithNegative').keypress(function (event) {
        NumberPostiveNegativeWithDecimal(event, this)
    });
 $('.DecimalNumberWithNegative').keyup(function (event) {
         ReplaceNegative(event, this); 
    });

function NumberPostiveNegativeWithDecimal(evt, element) {
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (
        (charCode != 45 || $(element).val().indexOf('-') != -1) &&
        (charCode != 46 || $(element).val().indexOf('.') != -1) &&
        (charCode < 48 || charCode > 57))
        evt.preventDefault();
    return true; 
}

function ReplaceNegative(event, element) { 
    var $$this = $(element).val();
    //alert($$this);
    var charCode = (event.which) ? event.which : event.keyCode
    if (charCode == 189 && $$this.indexOf('-') > 0) {
        value = $$this.replace('-', '');
        $(element).val(value);
        event.preventDefault();
    } 
}