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

Allow numbers, decimals, negative

This solution prevents double minuses or dots.

Just add number to input class.

$("input.number").on('keypress', function(e) {
    var caret = e.target.selectionStart;
    var nowStr = $(this).val().substr(0, caret) + String.fromCharCode(e.which) + $(this).val().substr(caret);
    if (!$.isNumeric(nowStr)) e.preventDefault();
});