CODEWITHSUNDEEP
asp.netasp.net-mvcvalidation
Ram
Ram

Reputation: 691

How to do multifield validation in MVC?

I'm able to validate each textbox separately by using data-val true but how can I do multi-field validation? I want to validate first name and last name together. Both fields are required. I'm using guid to generate an unique id so the values can be passed to the controller.

<input type="text" data-val="true" data-val-required="This field is required." name="FormResponse.NameResponse[@guid].FirstName" />
<span data-valmsg-for="FormResponse.NameResponse[@guid].FirstName" data-valmsg-replace="true"></span>

<input type="text" data-val="true" data-val-required="This field is required." name="FormResponse.NameResponse[@guid].LastName" />
<span data-valmsg-for="FormResponse.NameResponse[@guid].LastName" data-valmsg-replace="true"></span>

Upvotes: 1

Views: 264

Answers (2)

Georg Patscheider
Georg Patscheider

Reputation: 9463

To validate on the server side (at the time when the request is bound to the ViewModel), implement IValidatableObject:

using System.ComponentModel.DataAnnotations;

public class MyViewModel : IValidatableObject {

    // note that we do not have a [Required] attribute here, 
    // or we would show two validation messages if one property is not set
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext) {
        if (string.IsNullOrWhiteSpace(FirstName) || 
            string.IsNullOrWhiteSpace(LastName)) {
                yield return new ValidationResult(
                  "Both first and last name are required!",
                   new[] { "FirstName", "LastName" }
               );
        }
    }
}

The messages generated by this validation method can be rendered using @Html.ValidationSummary(). It will be shown after a round trip to the server on which validation failed.

You can test whether the model is valid in the controller by calling ModelState.IsValid.

ASP.NET MVC: Self Validating Model objects

Upvotes: 1

Hichem Al Abbessi
Hichem Al Abbessi

Reputation: 84

Use a ViewModel , and validate on submit/focusOut.

Upvotes: 0

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