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POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
 

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  1. POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
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    <p>I have setup Knockoutjs to dynamically create an editable list of values using the following code:</p> <pre><code> var requirementModel = function() { var self = this; self.requirementtypes = ko.observableArray(@Html.Interpret(Model.requirementtypes)); self.requirementid = ko.observable(@Html.Interpret(Model.requirementid)); self.AddRequirementType = function() { self.requirementtypes.push({ requirementtypeid: null, number: "", requirementid: 0 }); }; self.RemoveType = function(Type) { self.requirementtypes.remove(Type); }; self.hookUpValidation = function() { $.validator.unobtrusive.parseDynamicContent('.dynamicData'); }; }; var viewModel = new requirementModel(); ko.applyBindings(viewModel); </code></pre> <p>With html:</p> <pre><code> &lt;div class="small-box dynamicData" data-bind="template:{ name: 'requirementType-template', foreach: requirementtypes, afterRender:$root.hookUpValidation }" &gt;&lt;/div&gt; &lt;button data-bind='click: AddType'&gt;Add Type&lt;/button&gt; </code></pre> <p>I have hooked up validation for dynamic data using the code recommended on <a href="https://stackoverflow.com/questions/4406291/jquery-validate-unobtrusive-not-working-with-dynamic-injected-elements">stackoverflow</a>.</p> <p>When I post back to the server (I'm not using JSON just form post) I can do more complex validation and if something fails I can use ModelState.AddModelError("input field name", "I pity the fool that broke this"); This works perfectly with either strongly type or @Html.ValidationMessage("input field name") for non dynamic fields</p> <p>However I can't find a way to hook Server Side Model Error to dynamic content.</p> <p>I have the span tags that work with the client side and they work perfectly. However they aren't getting hooked into data returned after serverside validation fails and return page. Any idea how to acheive this?</p> <p>Thanks</p>
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    1. USGraemeMiller
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      1. POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
      1. USAnders Fjeldstad
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      1. POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
      1. USUlf Lindback
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    1. COThe preferred approach is to build a custom ModelBinder to bind the incoming values to your model and let the default validation mechanism to kick-in. Do you mean your models are generated on client-side and you do not have it defined on server?
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      1. POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
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    2. COModel is defined on server side. A section of the page uses knockoutjs to add items to a list. I am getting everything back perfectly via post. The dynamic data is all posted. The issue is if I raise an error server side (e.g. complex validation) and then return to the view any errors raised against dynamically created items aren't bound.
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      1. POHow do I get ModelState.AddModel Error to bind to knockout dynamically created validation spans?
      1. USGraemeMiller
    3. COI'm thinking I am probably going to have to access modelstate and add appropriate errors to Knockout model and then use that. Just wondered if there was a more elegant way (like how I got client side validation)
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      1. USGraemeMiller
 

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