Knockout, how to subscribe to every change in observableArray

Question

can you help me to get subscription on every change of my observable collection and on every item change. Didn't find information on http://knockoutjs.com/documentation/observableArrays.html

$(document).ready(function () {

    var Item = function (isSelected, isEnabled, errorState,
    name, group, processed, errors, state) {
        var self = this;
        self._isSelected = ko.observable(isSelected);
        self._isEnabled = ko.observable(isEnabled);
        self._errorState = ko.observable(errorState);
        self._name = ko.observable(name);
        self._group = ko.observable(group);
        self._processed = ko.observable(processed);
        self._errors = ko.observable(errors);
        self._state = ko.observable(state);
    };

    function ViewModel() {
        var self = this;
        self.SentinelList= ko.observableArray([
        ko.observable(new Item(false, false, false, 'Mail1', 'Mailing', 4, 0, 1)),
        ko.observable(new Item(false, false, false, 'Ident1', 'Identity', 5, 0, 0)),
        ko.observable(new Item(false, false, false, 'Cook', 'Look', 2, 0, 1))]);
    }

    var vm = new ViewModel();

    for (var item in vm.SentinelList) {
        item.subscribe(function () {
            console.log('List changed');
        });
    }

    ko.applyBindings(vm);
});

Answer 1

You can use the subscribe againt the array :

    self.SentinelList.subscribe(function (changes) {

        changes.forEach(function (change) {
            if (change.status === 'added') {
                 console.log('new item !!');
                 change.value.subcriptions.push(change.value.subscribe(event));
            } else if (change.status === 'deleted') {
                ko.utils.arrayForEach(change.value.subcriptions, function(s) {
                    if(s) s.dispose();
                }
                                     );
                console.log('deleted item !!');
            }
        });

    }, null, "arrayChange");

See fiddle