Blasor Form Validation Library

[Frangoudes Panikos]

Hello,

 Are there any examples how to use the Blasor Form Validation Library like is  advertised in Form Validation library to validate HTML form elements ?

[Berly Christopher]

Hi Frangoudes, 

  

Greetings from Syncfusion. 

  

You can achieve the blazor form validation for form elements using data annotation support. We have prepared the sample for validate our EJ2 TextBox, DatePicker and NumericTextBox component using data annotation as mentioned in the below code example.  

[Pages/Index.razor] 

<EditForm Model="@employee" OnValidSubmit="@HandleValidSubmit" OnInvalidSubmit="@HandleInvalidSubmit"> 

    <DataAnnotationsValidator /> 

    <div class="form-group"> 

        <label for="employee-id">Employee ID</label> 

        <EjsTextBox id="employee-id" Placeholder='Provide employee ID' bind-Value="@employee.EmpID"></EjsTextBox> 

        <ValidationMessage For="@(() => employee.EmpID)" /> 

    </div> 

    <div class="form-group"> 

        <label for="employee-name">Employee Name</label> 

        <EjsTextBox id="employee-name" Placeholder='Provide employee name' bind-Value="@employee.Name"></EjsTextBox> 

        <ValidationMessage For="@(() => employee.Name)" /> 

    </div> 

    <div class="form-group"> 

        <label for="DOB">Date of Birth</label> 

        <EjsDatePicker id="date-of-birth" Placeholder='Provide employee age older than 21yrs' bind-Value="@employee.DateOfBirth"></EjsDatePicker> 

        <ValidationMessage For="@(() => employee.DateOfBirth)" /> 

    </div> 

    <div class="form-group"> 

        <label for="salary">Salary</label> 

        <EjsNumericTextBox id="salary" Placeholder="Enter the salary" bind-Value="@employee.Salary" Step="1000"></EjsNumericTextBox> 

        <ValidationMessage For="@(() => employee.Salary)" /> 

    </div> 

    <button type="submit" class="btn btn-primary">Register</button> 

    <h2>@FormValidateState</h2> 

</EditForm> 

 

@functions { 

    public string FormValidateState = "Click Register button to validate and submit the form."; 

    public Employee employee = new Employee(); 

 

    public void HandleValidSubmit() 

    { 

        FormValidateState = "Submitted form is valid."; 

 

    } 

    // Form Validation State : @FormValidationState 

    public void HandleInvalidSubmit() 

    { 

        FormValidateState = "Submitted form is invalid."; 

 

    } 

 

    public class Employee 

    { 

        [Required(ErrorMessage = "Employee ID is required")] 

 

        public string EmpID { get; set; } 

 

        [Required(ErrorMessage = "Name is required")] 

        public string Name { get; set; } 

 

        [Required] 

        [DateOfBirthValidationAttribute(ErrorMessage = "Employee age must be older than 21yrs.")] 

        public DateTime? DateOfBirth { get; set; } = new DateTime(1998, 1, 1); 

 

        [Required] 

        [Range(5000, 10000, ErrorMessage = "Salary range is invalid (5000-10000).")] 

        public object Salary { get; set; } 

 

    } 

 

    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)] 

    public class DateOfBirthValidationAttribute : ValidationAttribute 

    { 

        public override bool IsValid(object value) 

        { 

            return (DateTime.Now - (DateTime)value).Days / 365 >= 21; 

        } 

    } 

} 

  

Please find the sample from the below link. 

Sample Link: http://www.syncfusion.com/downloads/support/forum/145156/ze/Form_validation_demo727349169  

Regards, 

Berly B.C 

[Frangoudes Panikos]

Thank you very much Berly for your prompt reply.

[Berly Christopher]

Hi Frangoudes, 

  

Most Welcome. We are glad to assist you. 

  

Regards, 

Berly B.C