Question

I have a JQuery code like this:

// Validation to avoid non alphanumeric characters from being typed
function alphanumeric(eventSource) {
    var numaric = eventSource.val();
    for (var j = 0; j < numaric.length; j++) {
        var alphaa = numaric.charAt(j);
        var hh = alphaa.charCodeAt(0);
        // If the value contains non alphanumeric characters
        if (!((hh > 47 && hh < 58) || (hh > 64 && hh < 91) || (hh > 96 && hh < 123))) {
            eventSource.val(numaric.substring(0, j) + numaric.substring(j + 1,  numaric.length));
        }
    }
}

I am trying to validate the special characters of a text box input.
But somehow, it also validates the space (space bar on keyboard), which the char code is 32.
Advice please, thanks.

Answer 1

Try this :

        function alphanumeric(eventSource) {
            var numaric = eventSource.val();
            for (var j = 0; j < numaric.length; j++) {
                var alphaa = numaric.charAt(j);
                var hh = String.charCodeAt(alphaa);                
                // If the value contains non alphanumeric characters
                if (hh != 32 && !((hh > 47 && hh < 58) || (hh > 64 && hh < 91) || (hh > 96 && hh < 123))) {
                    eventSource.val(numaric.substring(0, j) + numaric.substring(j + 1, numaric.length));
                }
            }
        }