Is there documentation about how to disable automatic validation and trigger manual validation?

[nicholasyin]

Description

For instance, I don't want the validation to automatically occur once a component lost focus. Instead, upon a submit button is clicked, I will invoke some kind of Validate method to perform a manual validation and, in case of validation errors, display the error message next to the origin component.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/blazor/forms/validation?view=aspnetcore-9.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/forms/validation.md

Document ID

bcb470e1-c859-0549-b4ef-c6c9b7ef2c72

Article author

@guardrex

Metadata

• ID: bcb470e1-c859-0549-b4ef-c6c9b7ef2c72
• PlatformId: b4c1bad9-fc7a-21f5-2552-f0f3617f77db
• Service: aspnet-core
• Sub-service: blazor

Related Issues

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[guardrex]

Hello @nicholasyin ... I don't understand the "once a component lost focus" part. Did you mean when a field loses focus?

Anyway, did you see the following ..............

https://learn.microsoft.com/en-us/aspnet/core/blazor/forms/validation?view=aspnetcore-9.0#business-logic-validation-with-a-validator-component

... which uses the CustomValidation component shown immediately before that section. That validation logic only runs after the Submit button is clicked.

[nicholasyin]

Hello @nicholasyin ... I don't understand the "once a component lost focus" part. Did you mean when a field loses focus?

Anyway, did you see the following ..............

https://learn.microsoft.com/en-us/aspnet/core/blazor/forms/validation?view=aspnetcore-9.0#business-logic-validation-with-a-validator-component

... which uses the CustomValidation component shown immediately before that section. That validation logic only runs after the Submit button is clicked.

Did you mean when a field loses focus?
Yes. And I looked at the article and found a custom validator component a bit overkill for my requirement. Anyway, I happened to find EditContext.EnableDataAnnotationsValidation method, and using a pattern like this:

editContext.EnableDataAnnotationsValidation(ServiceProvider);
editContext.Validate();

in EditForm.OnSubmit handler proved working as I expected. Thanks all the same and you can close this issue.