operatationsAsChecked

ko.bindingHandlers.operationsAsChecked = {
    init: function (element, valueAccessor, allBindings) {
        // Guest does nothing - disable
        var value = ko.utils.unwrapObservable(valueAccessor());
        var observable = valueAccessor();
        var guestBtn = $("button", element);

        guestBtn.on("click", function () {
            var checkboxes = $("input", element);
            if (observable().indexOf("Guest") == -1) {
                checkboxes.each(function () {
                    var chkb = this;
                    var $chkb = $(chkb);
                    $chkb.removeAttr("checked");
                    $chkb.attr("disabled", "disabled");
                });

                observable("Guest");
                guestBtn.html("<i class=\"fa fa-check\"></i> Is A Guest");
            } else {
                checkboxes.each(function () {
                    var chkb = this;
                    var $chkb = $(chkb);
                    $chkb.removeAttr("disabled");
                });
                observable("");
                guestBtn.html("Make A Guest");
            }
        });

        $(element).on("click", "input[type=checkbox]", function () {
            var chkb = this;
            var $chkb = $(chkb);
            var currentObservableOperations = observable().split(",");

            if ($chkb.is(":checked")) {
                currentObservableOperations.push($chkb.val());
            } else {
                currentObservableOperations = $.grep(currentObservableOperations, function (value) {
                    return !(value == $chkb.val())                                            
                });
            }

            observable(currentObservableOperations.join());
        });

        var checkboxes = $("input", element);

        //  Guests get no values!!
        if (observable().indexOf("Guest") > -1) {
            checkboxes.each(function () {
                var chkb = this;
                var $chkb = $(chkb);
                $chkb.attr("disabled", "disabled");
            });

            guestBtn.html("<i class=\"fa fa-check\"></i> Is A Guest");
        } else {
            checkboxes.each(function () {
                var chkb = this;
                var $chkb = $(chkb);
                
                if (observable().indexOf($chkb.val()) > -1) {
                    $chkb.attr("checked","checked");
                }
            });
        }
    }
};