FilamentPHP: Add "Select all" to Select Component

If you need to select all options in a Multi-Select Form Component, you can achieve this easily by adding a 'hint' action.

->hintAction(Forms\Components\Actions\Action::make('select_all')
    ->label(__('Select all'))
    ->action(fn (Forms\Components\Select $component) => $component->state(array_keys($component->getOptions())))
)

The final component should look this

Forms\Components\Select::make('select_all_options')
    ->multiple()
    ->options([
        '1' => 'Laravel Hive',
        '2' => 'FilamentPHP',
        '3' => 'Laravel',
    ])
    ->hintAction(Forms\Components\Actions\Action::make('select_all')
        ->label(__('Select all'))
        ->action(fn (Forms\Components\Select $component) => $component->state(array_keys($component->getOptions())))
    )

When you view your form, you will see a 'Select all' button next to the label.