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POASP.NET MVC CheckboxListFor values not posting back
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  1. POASP.NET MVC CheckboxListFor values not posting back
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    copied!<p>In desperation, I created a CheckboxListFor method as follows (I ripped this off from somewhere, probably here).</p> <pre><code>public static MvcHtmlString CheckBoxListFor&lt;TModel, TProperty&gt;(this HtmlHelper&lt;TModel&gt; htmlHelper, Expression&lt;Func&lt;TModel, IEnumerable&lt;TProperty&gt;&gt;&gt; expression, MultiSelectList multiSelectList, object htmlAttributes = null) { //Derive property name for checkbox name var body = expression.Body as MemberExpression; string propertyName = body.Member.Name; //Get currently select values from the ViewData model IEnumerable&lt;TProperty&gt; list = expression.Compile().Invoke(htmlHelper.ViewData.Model); //Convert selected value list to a List&lt;string&gt; for easy manipulation var selectedValues = new List&lt;string&gt;(); if (list != null) { selectedValues = new List&lt;TProperty&gt;(list).ConvertAll(i =&gt; i.ToString()); } //Create div var divTag = new TagBuilder("div"); divTag.MergeAttributes(new RouteValueDictionary(htmlAttributes), true); //Add checkboxes foreach (SelectListItem item in multiSelectList) { divTag.InnerHtml += String.Format("&lt;div&gt;&lt;input type=\"checkbox\" name=\"{0}\" id=\"{0}_{1}\" " + "value=\"{1}\" {2} /&gt;&lt;label for=\"{0}_{1}\"&gt;{3}&lt;/label&gt;&lt;/div&gt;", propertyName, item.Value, selectedValues.Contains(item.Value) ? "checked=\"checked\"" : "", item.Text); } return MvcHtmlString.Create(divTag.ToString()); } </code></pre> <p>I call it like so:</p> <pre><code> &lt;h2&gt;Rights&lt;/h2&gt; &lt;div&gt; @Html.CheckBoxListFor(m=&gt;m.SelectedRights, Model.Rights) &lt;/div&gt; </code></pre> <p>And it renders out correctly. However, the selected values do not post back. How do I go about fixing this? Can anybody suggest a good starting point?</p> <p><strong>Update:</strong> I thought it might be good to add some more detail, as this thing may have multiple issues.</p> <p>The ids of the checkboxes are coming out like "SelectedRights_6". Here's the ViewModel I'm currently using.</p> <pre><code> public class RoleSingleViewModel : BaseEntitySingleViewModel { public override int ListViewColSpan { get { return 6; } } public string Name {get;set;} public string Description {get;set;} public IEnumerable&lt;SelectListItem&gt; Sites {get;set;} public int SiteId{get;set;} public string SiteText{get;set;} public override string TypeName { get { return "Role"; } } public MultiSelectList Rights { get{return new MultiSelectList(AllRights, "Key", "Value", SelectedRights);}} public List&lt;KeyValuePair&lt;int, string&gt;&gt; AllRights { get; set; } public List&lt;KeyValuePair&lt;int, string&gt;&gt; SelectedRights { get; set; } } </code></pre> <p>Also, the update method on the controller is like so. I set a breakpoint on the line where the exception is thrown and examined updateItem. The value of Rights, AllRights, and SelectedRights are not filled in (which is, I guess, expected behavior). I'm thinking my problem might be with the structure of my ViewModel. How should I change it?</p> <pre><code>[HttpPost] public ActionResult Edit(RoleSingleViewModel updateItem) { throw new NotImplementedException(); } </code></pre>
 

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