How to give Flash message a custom css class in cake 3

Question

I want to give a Flash message a custom css class in Cakephp 3, there is my function in my (edit in this case) controller:

public function edit($id = null)
{
    $this->viewBuilder()->layout('personalizado');
    $user = $this->Users->get($id, [
        'contain' => []
    ]);
    if ($this->request->is(['patch', 'post', 'put'])) {
        $user = $this->Users->patchEntity($user, $this->request->data);
        if ($this->Users->save($user)) {
            $this->Flash->success('Utilizador editado com sucesso.', 'default', ['class' => 'alert alert-success']);
            return $this->redirect(['action' => 'index']);
        } else {
            $this->Flash->error(__('Erro ao apagar utilizador, por favor tente de novo.'));
        }
    }
    $this->set(compact('user'));
    $this->set('_serialize', ['user']);
}

I added the custom css claas in this line:

$this->Flash->success('Utilizador editado com sucesso.', 'default', ['class' => 'alert alert-success']);

but is not working, thanks in advance.

Answer 1

// In your Controller
$this->Flash->success('The user has been saved', [
    'params' => [
        'class' => 'alert alert-success'
    ]
]);

// In your View
<?= $this->Flash->render() ?>

<!-- In src/Template/Element/Flash/success.ctp -->
<div class="<?= h($params['class']) ?>">
    <?= h($message) ?>
</div>