Completed
Last Updated:
26 Jul 2019 07:50
by ADMIN
Release 1.4.0
RickC
Created on:
15 Jul 2019 07:03
Category:
DropDownList
Type:
Bug Report
Validation is triggered immediately upon load when binding to nullable GUID
When bound to a nullable GUID, the DropDownList invokes validation and shows validation messages as soon as the view loads.
Expected: the same behavior as with nullable int - validation is to be triggered by the form submission or selection from the dropdown.
Worked as expected in 1.2.0.
Reproducible:
@using Telerik.Blazor.Components.DropDownList@using System.ComponentModel.DataAnnotations<EditForm Model="@person" OnValidSubmit="@HandleValidSubmit"> <DataAnnotationsValidator /> <ValidationSummary /> <p class="gender"> Gender: <TelerikDropDownList @bind-Value="person.Gender" DefaultItem="@ddlHint" Data="@genders" TextField="MyTextField" ValueField="MyValueField"> </TelerikDropDownList> <ValidationMessage For="@(() => person.Gender)"></ValidationMessage> </p> <button type="submit">Submit</button></EditForm>@code { // Usually the model classes would be in different files public class Person { [Required(ErrorMessage = "Gender is mandatory.")]//the value field in the dropdown model must be null in the default item public Guid? Gender { get; set; } } public class MyDdlModel { //nullable so the default item can allow required field validation public Guid? MyValueField { get; set; } public string MyTextField { get; set; } } Person person = new Person(); MyDdlModel ddlHint = new MyDdlModel { MyValueField = null, MyTextField = "Gender" }; IEnumerable<MyDdlModel> genders = new List<MyDdlModel>{ new MyDdlModel {MyTextField = "female", MyValueField = new Guid()}, new MyDdlModel {MyTextField = "male", MyValueField = new Guid()}, new MyDdlModel {MyTextField = "other", MyValueField = new Guid()}, new MyDdlModel {MyTextField = "I'd rather not say", MyValueField = new Guid()} }; void HandleValidSubmit() { Console.WriteLine("OnValidSubmit"); }}
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