CODEWITHSUNDEEP
asp.netasp.net-mvcvalidationdata-annotationsasp.net-core-mvc
Thomas Andreè Wang
Thomas Andreè Wang

Reputation: 3429

Disable some [Required] field validators in a view

ASP.NET MVC Core if that makes any difference

Is there a simple way to disable some field validators in a model or view under certain cases?

Most information on the web looks to be from the ASP.NET Forms era. I could not find too many things to try out but, this looks to not do the trick. 

<label asp-for="Files.PromoImage" class="col-md-2 control-label"></label>
<div class="col-md-10">
    <input asp-for="Files.PromoImage" class="form-control" />
    @if (Model.Content.NewArticle)
    {
        <span asp-validation-for="Files.PromoImage" class="text-danger"></span>
    }
</div>
<div class="col-md-8">
    <div asp-validation-summary="ValidationSummary.All" class="text-danger"></div>
</div>

Upvotes: 1

Views: 861

Answers (1)

regnauld
regnauld

Reputation: 4336

<input asp-for="Files.PromoImage"/> will generate validation span and data-required attribute if the PromoImage property is marked with the [Required] attribute. You can check the generated html in the browser.

The easiest way to achieve what you want is to remove the [Required] attribute in the model and have something like this in the view:

@if (Model.Content.NewArticle)
{
    <input class="form-control" data-val="true" 
        data-val-required="The PromoImage field is required." name="Files.PromoImage" 
        placeholder="Promo Image" type="text" value="">        
}
else
{
    <input asp-for="Files.PromoImage" class="form-control"/>
}

Then again on the server, in your post action method, you have to do a manual validation for the PromoImage property.

Not so trivial but more elegant approach is to extend the MVC and jQuery validation with your own validation attribute and jQuery validator, e.g. [RequiredIf]. The API is slightly different in ASP.NET Core 1.0, but here is an example: Custom validation

Upvotes: 1

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