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POASP.NET MVC Checkbox Group
 

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    <p>I am trying to formulate a work-around for the lack of a "checkbox group" in ASP.NET MVC. The typical way to implement this is to have check boxes of the same name, each with the value it represents.</p> <pre><code>&lt;input type="checkbox" name="n" value=1 /&gt; &lt;input type="checkbox" name="n" value=2 /&gt; &lt;input type="checkbox" name="n" value=3 /&gt; </code></pre> <p>When submitted, it will comma delimit all values to the request item "n".. so Request["n"] == "1,2,3" if all three are checked when submitted. In ASP.NET MVC, you can have a parameter of n as an array to accept this post.</p> <pre><code>public ActionResult ActionName( int[] n ) { ... } </code></pre> <p><strong>All of the above works fine.</strong> The problem I have is that when validation fails, the check boxes are not restored to their checked state. Any suggestions.</p> <p><strong>Problem Code:</strong> (I started with the default asp.net mvc project)</p> <p>Controller</p> <pre><code> public class HomeController : Controller { public ActionResult Index() { var t = getTestModel("First"); return View(t); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult Index(TestModelView t) { if(String.IsNullOrEmpty( t.TextBoxValue)) ModelState.AddModelError("TextBoxValue", "TextBoxValue required."); var newView = getTestModel("Next"); return View(newView); } private TestModelView getTestModel(string prefix) { var t = new TestModelView(); t.Checkboxes = new List&lt;CheckboxInfo&gt;() { new CheckboxInfo(){Text = prefix + "1", Value="1", IsChecked=false}, new CheckboxInfo(){Text = prefix + "2", Value="2", IsChecked=false} }; return t; } } public class TestModelView { public string TextBoxValue { get; set; } public List&lt;CheckboxInfo&gt; Checkboxes { get; set; } } public class CheckboxInfo { public string Text { get; set; } public string Value { get; set; } public bool IsChecked { get; set; } } } </code></pre> <p>ASPX</p> <pre><code>&lt;% using( Html.BeginForm() ){ %&gt; &lt;p&gt;&lt;%= Html.ValidationSummary() %&gt;&lt;/p&gt; &lt;p&gt;&lt;%= Html.TextBox("TextBoxValue")%&gt;&lt;/p&gt; &lt;p&gt;&lt;% int i = 0; foreach (var cb in Model.Checkboxes) { %&gt; &lt;input type="checkbox" name="Checkboxes[&lt;%=i%&gt;]" value="&lt;%= Html.Encode(cb.Value) %&gt;" &lt;%=cb.IsChecked ? "checked=\"checked\"" : String.Empty %&gt; /&gt;&lt;%= Html.Encode(cb.Text)%&gt;&lt;br /&gt; &lt;% i++; } %&gt;&lt;/p&gt; &lt;p&gt;&lt;input type="submit" value="submit" /&gt;&lt;/p&gt; &lt;% } %&gt; </code></pre> <p><strong>Working Code</strong></p> <p>Controller</p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] public ActionResult Index(TestModelView t) { if(String.IsNullOrEmpty( t.TextBoxValue)) { ModelState.AddModelError("TextBoxValue", "TextBoxValue required."); return View(t); } var newView = getTestModel("Next"); return View(newView); } </code></pre> <p>ASPX</p> <pre><code>int i = 0; foreach (var cb in Model.Checkboxes) { %&gt; &lt;input type="checkbox" name="Checkboxes[&lt;%=i%&gt;].IsChecked" &lt;%=cb.IsChecked ? "checked=\"checked\"" : String.Empty %&gt; value="true" /&gt; &lt;input type="hidden" name="Checkboxes[&lt;%=i%&gt;].IsChecked" value="false" /&gt; &lt;input type="hidden" name="Checkboxes[&lt;%=i%&gt;].Value" value="&lt;%= cb.Value %&gt;" /&gt; &lt;input type="hidden" name="Checkboxes[&lt;%=i%&gt;].Text" value="&lt;%= cb.Text %&gt;" /&gt; &lt;%= Html.Encode(cb.Text)%&gt;&lt;br /&gt; &lt;% i++; } %&gt;&lt;/p&gt; &lt;p&gt;&lt;input type="submit" value="submit" /&gt;&lt;/p&gt; </code></pre> <p>Of course something similar could be done with Html Helpers, but this works.</p>
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    1. USGreg Ogle
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    1. COPost the code for your controller.
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      1. USRobert Harvey
    2. COAs they say in The Matrix; there is no state ;) http://stackoverflow.com/questions/1473483/asp-net-mvc-and-viewstate
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    3. CO@magnus: That's a lot to wade through for what is probably a simple problem in the controller.
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