Modules + PubSub

gistfile1.js

//Module

Widget = function (core) {
    var Entry = function (entryText, accountId) {
        this.EntryText = entryText;
        this.AccountId = accountId;
    };

    var EntriesViewModel = function () {
        var that = this;

        this.selectedAccount = null;
        this.allEntries = new ko.observableArray();
        this.newEntry = new ko.observable();

        this.getAllEntries = function (accountId) {
            that.selectedAccount = accountId;

            $.getJSON(getAllEntriesUrl + accountId, null, function (data, textStatus, xhr) {
                that.allEntries.removeAll();

                $.each(data, function (index, item) {
                    var existingEntry = new Entry(item.EntryText);
                    that.allEntries.push(existingEntry);
                });
            });
        };

        this.addEntry = function () {
            if ((this.newEntry() !== '')) {
                var entry = new Entry(this.newEntry(), that.selectedAccount);

                $.post(Nomos.Routes.addEntryUrl, entry, function (data, textStatus, xhr) {
                    core.publish('/entry/new', [entry]);
                    that.allEntries.push(entry);
                    that.newEntry('');
                }, 'JSON');
            }
        };
    };

    var entriesVM = new EntriesViewModel();

    return {

        init: function () {
            ko.applyBindings(entriesVM, document.getElementById('entries'));
            core.subscribe('/account/changed', entriesVM.getAllEntries);
        },

        destroy: function () {
            entriesVM = null;
        }
    }
};