860701a18f214528cdfff2ad843f9e95 by 2025

Author:2025
Language: eng
Format: epub
Published: 2025-05-28T17:25:15+00:00

Chapter 6 Forms in Blazor

to do it is by using ValidationMessage component (see Listing 6-4). These can be placed anywhere inside EditForm, and the message displayed will be determined by the model property specified.

You can also handle different submit outcomes, both valid and invalid submit cases. This can be used for providing suggestions when inputs continue to be invalid, or for something like logging to improve user experience.

Validation Attributes

So far you have seen a few attributes and how they can be applied. Below you will find a full list of attributes available in Blazor. They all take different parameters and have different overrides, but every one of them will have ErrorMessage parameter where custom error message can be set.

Required

Ensures the field is not null or empty.

Example: [Required(ErrorMessage = “Name is required.”)]

Range

Specifies the minimum and maximum values allowed for a numeric property.

Example: [Range(18, 80, ErrorMessage = “Age must be between 18

and 80.”)]

StringLength

Specifies the maximum (and optionally minimum) length of a string.

Example: [StringLength(50, ErrorMessage = “Name cannot exceed 50

characters.”)]

MinLength

Specifies the minimum length of a string.

Example: [MinLength(5, ErrorMessage = “Password must be at least 5

characters long.”)]

MaxLength

Specifies the maximum length of a string.

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