gistfile1.js

$(function () {
    $("#selectall").click(function () {
        $('.case').prop('checked', this.checked);
    });
    $(".case").click(function () {
        if ($(".case").length == $(".case:checked").length) {
            $("#selectall").prop("checked", true);
        } else {
            $("#selectall").prop("checked", false);
        }

        var sList = "";
        $(".case:checked").each(function () {
            sList += "(" + $(this).val() + "-" + (this.checked ? "checked" : "not checked") + ")";
        });
        $("#log").html(sList);
        $("#s").html($(".case:checked").serialize());
    });
});