Validation messages not working properly

[FrancescoTerrosi]

Package

filament/filament

Package Version

v5.x

Laravel Version

v12+

Livewire Version

v4

PHP Version

PHP 8.4

Problem description

Validation messages simply seem to not work.

I have a resource with some fields that require validation (from a simple 'required' to a 'min/max' check), e.g.:

TextInput::make('name') ->required() ->validationMessages([ 'required' => 'Inserire il nome del partner.', ]) ->label('Nome'),

My validation messages are ignored in the resource creation page and default messages are displayed instead.

Expected behavior

The framework should display my custom validation messages.

Steps to reproduce

1. Create Filament user
2. Go to /admin panel
3. Log in and create a new "Partner" from "Partner resource"
4. Click the "Create" button without inserting anything (will break the validation rule "required" for the "name" field labeled "Nome"
5. [Optionally] Create any form component in a resource that has custom validation messages

Reproduction repository (issue will be closed if this is not valid)

https://github.com/FrancescoTerrosi/validation-messages-bug/tree/main

Relevant log output

[Nicholasbell03]

I have confirmed this behaviour with the reproduction repository, and also in a separate repository using v5.
The issue stems from changes in livewire from v3.5 to v4.0.

Please see a fix proposed in #19006 which solves this and adds test coverage.

[danharrin]

Browser validation messages should be working, it is a core feature of Filament. It prevents unnecessary network requests to check if a form is valid or not. I do not consider this a bug, and I am very confused by @Nicholasbell03 comments and the PR that mention that this is a change in behaviour between Livewire 3 and 4. As far as I am aware, it has always been like this.

Validation messages defined in validationMessages() are for server-side validation only, we cannot control browser validation messages.

Below is a screenshot of browser validation in action with Filament 4 / Livewire 3:

[FrancescoTerrosi]

@danharrin I am referring to Filament v5 and this indeed is a bug as my custom messages are not displayed, as shown in the repo.
I've always used this mechanism with no issues in older versions (v3, v4) of Filament.

[danharrin]

There are certain cases, for example when a text input is inside a collapsible Section, that we cannot use browser validation, and your custom validation messages will be used immediately on form submission. But I promise you that this behaviour has not changed between in v5. We have always used browser validation where possible by defaulting to backend validation. We can only control the messages sent by backend validation.