Validate when not empty

Question

Still with Tag Helper, We are in User Profile page, this page also include Change password option, the users are able to skip if they don't want to change the password, so the logic is the validation should be run if newPassword not empty!

if I use below:

    [DataType(DataType.Password)]  
    [Display(Name = "New Password")]  
    [StringLength(250, MinimumLength = 6, ErrorMessage = "Minimum 6 character password required")]  
    public string newPassword { get; set; } = "";  

    [NotMapped]  
    [Required(ErrorMessage = "Verify Password required")]  
    [CompareAttribute("newPassword", ErrorMessage = "Password doesn't match.")]  
    [DataType(DataType.Password)]  
    public string verifyPassword { get; set; } = "";  

if users don't want to change their password, then newPassword would be left empty, but it would be still validated here.

any body can give me an advice, how to deal with this?

Answer 1

Hi @Dondon510 ,

You can use the custom validation to build a conditional validation, refer the following sample:

1. Create a UserProfile model:
2. Create a RequiredIfAttribute class:
3. MVC controller:
4. The View page: Add the following scripts to achieve the custom client side validation:

You can view the above source code from here: 226071-customvalidation.txt

Then, the output as below:

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Best Regards,
Dillion