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POASP.NET MVC - Can't bind array to view model
 

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  1. POASP.NET MVC - Can't bind array to view model
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    <p>I have a view model with a from that includes a set of checkboxes. I need the check boxes to map to an array when binding in the post back method of my controller.</p> <p>Here's the view model.</p> <pre><code>@model TMDM.Models.TestSeriesCreateViewModel @{ ViewBag.Title = "Create"; } &lt;h2&gt;Create a Test Series&lt;/h2&gt; @using (Html.BeginForm()) { @Html.ValidationSummary(true) &lt;fieldset&gt; &lt;div class="editor-label"&gt; @Html.LabelFor(model =&gt; model.Title) &lt;/div&gt; &lt;div class="editor-field"&gt; @Html.EditorFor(model =&gt; model.Title) @Html.ValidationMessageFor(model =&gt; model.Title) &lt;/div&gt; &lt;h3&gt;Which Test Collections are in this Test Series?&lt;/h3&gt; &lt;div class="editor-field"&gt; @{ var i = 0; foreach (var testCollection in Model.TestCollections) { &lt;input type="checkbox" id="ChosenTestCollectionIds[@i]" name="ChosenTestCollectionIds[@i]" value="@testCollection.Id" /&gt; &lt;span&gt;@testCollection.Title&lt;/span&gt; &lt;br /&gt; i++; } } &lt;/div&gt; &lt;p&gt; &lt;input type="submit" value="Save" class="medium green awesome" /&gt; @Html.ActionLink("Cancel", "Index", "TestSeries", null, new { @class = "medium black awesome" }) &lt;/p&gt; &lt;/fieldset&gt; </code></pre> <p>The form is rendering fine, I've checked the source and each output check box has a different number for their id and name fields.</p> <pre><code>&lt;input type="checkbox" id="ChosenTestCollectionIds[0]" name="ChosenTestCollectionIds[0]" value="5" /&gt; &lt;input type="checkbox" id="ChosenTestCollectionIds[1]" name="ChosenTestCollectionIds[1]" value="6" /&gt; //etc... </code></pre> <p>Here is the view model.</p> <pre><code>public class TestSeriesModel { public int Id { get; set; } public string Title { get; set; } } public class TestSeriesCreateViewModel : TestSeriesModel { public List&lt;ITestCollectionDataObject&gt; TestCollections { get; set; } public int[] ChosenTestCollectionIds { get; set; } } </code></pre> <p>Problem I'm having is that when the form posts back the ChosenTestCollectionIds array comes back null. What am I doing wrong here?</p> <p><strong>ANSWER</strong></p> <p>I've worked out how to do it:</p> <pre><code>&lt;input type="checkbox" id="[@i]" name="ChosenTestCollectionIds" value="@testCollection.Id" /&gt; </code></pre>
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    1. COHello. I might help you more in a couple of hours, but in the meanwhile you want all of the checkboxes to have the same "name" attribute and different "id". Try that and see if it works.
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    2. CO@payntbrush: Perfect. +1 for beating me to it by 2.
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      1. USVarun Vohra
 

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