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POObservable arrays with knockout publishing/subscribing
 

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    <p>I'm following this post: </p> <p><a href="http://www.knockmeout.net/2012/05/using-ko-native-pubsub.html" rel="nofollow">http://www.knockmeout.net/2012/05/using-ko-native-pubsub.html</a></p> <p>to allow one of my vms to communicate with the other. One of my viewModels has an array that I need to expose to another viewModel. If this array is not an observable, the method from the above post works just fine. </p> <p>If the array is an observable array, publishedSelectedFolders is never populated. I'm trying to figure out why; hopefully it's something silly I'm doing. </p> <p>Here's my jsFiddle: </p> <p><a href="http://jsfiddle.net/PTSkR/40/" rel="nofollow">http://jsfiddle.net/PTSkR/40/</a></p> <p>If you uncomment the line in the vm, it works as expected (publishedSelectedFolders is populated as checks are ticked). Why is this happening?</p> <p>Code: </p> <pre><code> /* * Pub/Sub (decouples VMs but lets them access each others' data) */ var postbox = new ko.subscribable(); ko.subscribable.fn.publishOn = function (topic) { this.subscribe(function (newValue) { postbox.notifySubscribers(newValue, topic); }); return this; //support chaining }; ko.subscribable.fn.subscribeTo = function (topic) { postbox.subscribe(this, null, topic); return this; //support chaining }; /* Selection code */ this.publishedSelectedFolders = ko.observableArray().subscribeTo("SELECTED_FOLDERS"); var vm = { folders: ko.observableArray([{ "folderId": "1" }, { "folderId": "2" }]), // folders: [{"folderId": "1"}, {"folderId": "2"}, {"folderId": "3"}], selectedFolderIds: ko.observableArray(), }; vm.folderIndex = {}; ko.utils.arrayForEach(vm.folders, function (folder) { vm.folderIndex[folder.folderId] = folder; }); /* monitors selections and publishes to the shell */ this.selectedFolders = ko.computed(function () { return ko.utils.arrayMap(vm.selectedFolderIds(), function (id) { return vm.folderIndex[id]; }); }).publishOn("SELECTED_FOLDERS"); ko.applyBindings(vm); </code></pre>
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