Comma and period checker

by Dave Mednick

HTML

<textarea name="testing" id="testing"></textarea>
<br />
<br />
<input type="text" id="kC" />
<br />
<input type="text" id="pC" />

JavaScript

var prevCode = 0;
$('#testing').keypress(function (e) {
    $('#kC').val(e.keyCode);
    $('#pC').val(prevCode);
    if ((prevCode == 44 || prevCode == 46) && (e.keyCode < 49 || e.keyCode > 57)) {
        var txtCurr = $('#testing').val();
        var lenCurr = txtCurr.length;
        var txtNew = txtCurr.substr(0,lenCurr);
        $('#testing').val(txtNew + " ");
    }
    prevCode = e.keyCode;
});