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Editorial Team
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Asked: 2026-05-26T19:51:19+00:00

I Just starting out w/ ASP.NET MVC 3 and I am trying to render

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I Just starting out w/ ASP.NET MVC 3 and I am trying to render out the following HTML for the string properties on a ViewModel on the create/edit view.

<input id="PatientID" name="PatientID" placeholder="Patient ID" type="text" value="" maxlength="30" />

Each value ties back to the property on the ViewModel, id & name are the property name, placeholder is the Display attribute, value is the value of the property, and maxlength is the StringLength attribute.

Instead of typing out the above HTML w/ the correct values for each of my string properties I thought I would try to create an EditorTemplate by the name of SingleLineTextBox and use UIHint on my string properties or pass the name of the view when I call EditFor. So far so good, except I can’t figure out how to get the maxlength value off the StringLength attribute.

Here is the code I have so far:

<input id="@ViewData.ModelMetadata.PropertyName" name="@ViewData.ModelMetadata.PropertyName" placeholder="@ViewData.ModelMetadata.DisplayName" type="text" value="@ViewData.Model" maxlength="??" />

As you can see, not sure how to set maxlength value. Anyone know how?

Also, am I going about this the best way? As I said before I could just write out the plain HTML myself for each property on the page. I’ve looked at using TextBoxFor it wasn’t setting the maxlength and was adding a bunch of validation markup to the HTML output because of the StringLength attribute which I do not want. Another option I saw was extensions/helpers off the HTML class.

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1 Answer

  1. Editorial Team

    Instead of the StringLength attribute (because it’s a validator attribute not a metadata provider) you can use the AdditionalMetadata attribute. Sample usage:

    public class ViewModel
{
    [AdditionalMetadata("maxLength", 30)]
    public string Property { get; set; }
}

    Basically it puts the value 30 under the key maxLength in the ViewData.ModelMetadata.AdditionalValues dictionary. So you can use it your EditorTemplate: 

    <input maxlength="@ViewData.ModelMetadata.AdditionalValues["maxLength"]" id="@ViewData.ModelMetadata.PropertyName" name="@ViewData.ModelMetadata.PropertyName" placeholder="@ViewData.ModelMetadata.DisplayName" type="text" value="@ViewData.Model"  />
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