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POMake SelectList observable
 

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    <p>I would like to make my SelectList observable so the ViewModel gets updated with changes made to that SelectList. I see the values displayed in the drop down list in my UI but I never see that selected value updated in my ViewModel, It is always null. I have other controls on the form that are updated without issue so I would like to know how, specifically, to make a SelectList observable. It seems SelectLists and knockout are a little different than a standard input control.</p> <p>I have the following in a class:</p> <pre><code>public string LocationId { get; set; } public IEnumerable&lt;SelectListItem&gt; Locations { get; set; } </code></pre> <p>I have the following that populates my array of locations:</p> <pre><code> private PersonViewModel _viewModel; public ActionResult Index() { var locations = new[] { new SelectListItem { Value = "US", Text = "United States" }, new SelectListItem { Value = "CA", Text = "Canada" }, new SelectListItem { Value = "MX", Text = "Mexico" }, }; _viewModel.Locations = locations; return View(_viewModel); } </code></pre> <p>I have the following in my markup:</p> <pre><code>&lt;script type="text/javascript"&gt; Person.ViewModel = ko.mapping.fromJS(@Html.Raw(Json.Encode(Model))); var locationsArray = ko.observableArray(@Html.Raw(Json.Encode(Model.Locations))); &lt;/script&gt; &lt;form&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt; Locations: &lt;/td&gt; &lt;td&gt; @Html.DropDownListFor(model =&gt; model.LocationId, new SelectList(Model.Locations, "Value", "Text"), new { id = "locationsArray" }) &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; </code></pre>
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