TagBoxValidateBy Enum

Lists values that define how a TagBox located within the standard EditForm is validated.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v20.2.dll

Declaration

public enum TagBoxValidateBy

Members

Name Description
Auto

If the Tags property is specified, the editor's tags are validated. If the Values property is specified, the editor's values are validated.

Tags

The editor's tags are validated.

Values

The editor's values are validated.

Related API Members

The following properties accept/return TagBoxValidateBy values:

Remarks

The DevExpress UI components support the Blazor's form validation. For more information, refer to the ASP.NET Core Blazor forms and validation MSDN article.

The code below uses the ValidateBy property to validate email addresses (custom tags) specified in the TagBox. In this example the following validation settings are specified:

After a user types an email address, the edit box is underlined in red or green: red indicates the editor contains an invalid tag(s) or is empty; green indicates the tags are valid.

<EditForm Model="@recipients" OnValidSubmit="@HandleValidSubmit" OnInvalidSubmit="@HandleInvalidSubmit">
    <DataAnnotationsValidator />
    <p>
        <label for="emails">Recipients:</label>
        <DxTagBox Id="emails"
                  NullText="Select email recipients"
                  Data="@Emails.DataSource"
                  TData="string"
                  TValue="string"
                  AllowCustomTags="true"
                  ValidateBy="TagBoxValidateBy.Tags"
                  @bind-Tags="@recipients.Data">
        </DxTagBox>
        <ValidationMessage For="@(() => recipients.Data)" />
    </p>
    <button type="submit">Submit</button>
</EditForm>

@code {
    EmailRecipients recipients = new EmailRecipients();

    private void HandleValidSubmit() {
        Console.WriteLine("OnValidSubmit");
    }
    private void HandleInvalidSubmit() {
        Console.WriteLine("OnInvalidSubmit");
    }
} 

TagBox Validation

For more information, refer to the following help topic: Validate Input.

Run Demo: TagBox - Validation

See Also