Edit in JSFiddle

$(document).ready(function (e) {
    $("input").on('click', function (e) {
        e.preventDefault();
        $.ajax({
            success: function () {
                $("input").val("Ajax success!");
            },
            error: function() {
                $("input").val("Ajax error!");
            }
        });
    });
});

<form ajax="true">
    <input type="submit" value="Without Ajax!" />
</form>