Validating multiple checkbox in ASP.NET MVC

Question

I have 4 checkboxes in my form and want user to select at least one of the checkbox when form is submitted.

I am using ExpressiveAnnotations.Attributes; reference as we use this in other part of project but it doesn't seems to be working for checkboxes.

I have 4 checkboxes lets say they are A, B, C, D and I have declared checkbox D as:

[Display(Name = "D Name")]
[AssertThat("(A == false) && (B == false) && (C == false) && (D== false)", ErrorMessage = "Required")]
public bool D { get; set; }

If I change 'AssertThat' to 'RequiredIf' - then it errors that A,B,C,D need to be Nullable

When I submit the form, all the other validations on the form works except this one. Once submitted, I can see the value of A,B,C,D are false.

I have looked into custom validation but can't seem to find what I am looking for.

Has anyone else has encountered this issue? Any help will be appreciated

Thanks,

tried looking into custom validation but no luck.

Jay · Accepted Answer · 2024-04-19 20:40:33Z

0

I was thinking wrong about AssertThat

i changed my AsertThat to:

[AssertThat("(A == true) || (B == true) || (C == true) || (D== true)", ErrorMessage = "Required")]

and thats working as expected.

answered Apr 19, 2024 at 20:40

Jay

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