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POUnobtrusive Validation when multiple controls have the same Name
 

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  1. POUnobtrusive Validation when multiple controls have the same Name
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    <p>I am having a problem with unobtrusive validation because I have a collection of controls and all have the same <strong>name</strong>. I would appreciate any input and will consider and entirely different approach</p> <p>My controls need the same name because they bind with a collection in the model and MVC4 uses control names for this (this is working). Unobtrusive validation finds the control based on the name so it’s always finding the last one.</p> <p>Here are all the details:</p> <p>I have a collection of Strings in my model.</p> <pre><code>public List&lt;String&gt; Signatures { get; set; } </code></pre> <p>The strings are bound to a collection of textBoxes in the view. The number of textBoxes is based on a selection from a radio button. If they choose 0 none are shown, choose 1 and one is shown, 2 and I show 2, up to a max of three.</p> <p>I just put 3 textBoxes in the view and use client side jQuery to show or hide based on the radio button selected.</p> <p>In the view, each textbox is an html Helper class bound with the model. Here is an example with two textboxes. (I add the validation span manually under each)</p> <pre><code>@Html.TextBoxFor(m =&gt; m.Signatures, new { @class = " firstSigLabel " }) &lt;span class="field-validation-valid" data-valmsg-for="Signatures" data-valmsg-replace="true"&gt;&lt;/span&gt; @Html.TextBoxFor(m =&gt; m.Signatures, new { @class = " secondSigLabel}) &lt;span class="field-validation-valid" data-valmsg-for="Signatures" data-valmsg-replace="true"&gt;&lt;/span&gt; </code></pre> <p>When save is clicked the action method correctly binds the two textBoxes with the Signatures collection.</p> <p>Now I need to add validation, which depends on the textBoxes that I am actually showing (the number from the radio button). I want the client side to work the same as it would if I just let MVC handle it (unobtrusive validation). We have a library that depends on this for some common tasks (like showing an indicator).</p> <p>When I show a text box, I use jQuery to add the attributes needed for unobtrusive validation (and remove them when I hide it). That way, if it is shown it is required and if it is hidden it is not required. Here are the inputs once they are visible:</p> <pre><code>&lt;input id="Signatures" class=" firstSigLabel" type="text" value="" name="Signatures" data-val-required="Enter a first Signature Label." data-val="true"&gt;&lt;/input&gt; &lt;input id="Signatures" class=" secondSigLabel" type="text" value="" name="Signatures" data-val-required="Enter a second Signature Label." data-val="true"&gt;&lt;/input&gt; </code></pre> <p>I also re-register the from with unobtrusive validation:</p> <pre><code>$(theForm).removeData('validator'); $.validator.unobtrusive.parse($(theForm)); </code></pre> <p>My problem is that unobtrusive validation uses the <strong>'data-valmsg-for'</strong> attribute in the SPAN, to find the element by <strong>name</strong>. However, I have two inputs with that name and it’s always finding the last one.</p> <p>I have tried changing the ID (Signatures1, Signatures2) but that does nothing.</p> <p>I cannot figure out how to change the name in the html helper, but if I do it will break the model binding in the controller.</p> <p>I know this is not simple – it is really obtrusive validation. I don’t know how to accomplish this with annotations since it is dependent on client side actions.</p> <p>I assume if I used ValidationMessageFor on three textboxes, bound to the same model property, I would still get this problem.</p> <p>Is there a way to overcome this?</p> <p>Am I missing something?</p> <p>Can you think of a better approach?</p>
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