Suppose that the dynamic part is the language of the application, assuming it is multilanguage, I would pass the parameter through the controller and it would work.

Now talking about ajax, or js?

Ok, but how am I supposed to set it for each field separately. I can change the template in factory, but I need to specify dynamic part in that template, which will be set for each field separately.

I'm not sure we are talking about the same thing.

@samdark только что мудохался с тем, что ListenerCollection::add не сохраняет список слушателей. Оказалось, что метод иммутабельный. А по имени и не скажешь ) и пример в доке такой, что тоже не намекает

I just have '{input}{text}' template for example, and I want to have a way to define {text} part later on for each field individually.

Similar to the way $field->label('somelabel') is applied, but my custom part

for example:

   'app' => [
       'nav' => [
           'guest' => [
               ['label' => 'Sing up', 'url' => '/registration/register'],
               ['label' => 'Sing in', 'url' => '/auth/login'],
           ],
           'logged' => [
               [
                   'label' => '<div class = "is-user-avatar">{logo}</div>' .
                              '<div class = "is-user-name"><span>{username}</span></div><span class="icon"></span>',
                   'items' => [
                       [
                           'label' => 'Profile',
                           'url' => '/setting/profile',
                           'icon' => 'mdi mdi-account',
                           'iconOptions' => 'icon'
                       ],
                       [
                           'label' => 'Setting Account',
                           'url' => '/setting/account',
                           'icon' => 'mdi mdi-settings',
                           'iconOptions' => 'icon'
                       ],
                       '-',
                       [
                           'label' => 'Logout',
                           'url' => '/auth/logout',
                           'icon' => 'mdi mdi-logout',
                           'iconOptions' => 'icon'
                       ]
                   ],
                   'options' => ['class' => 'has-dropdown-with-icons has-divider has-user-avatar'],
                   'encode' => false,
               ]
           ]
       ],

its config nav widget in logged have {logo}{username}.

if (isset($identity) && $identity->getId() !== null) {
   $navConfig['brand()'] = [$app->get('app.navBar.brand')];
   $navConfig['menuOptions()'] = [['class' => 'navbar-menu fadeIn animated faster', 'id' => 'navbar-menu']];
   $navConfig['options()'] = [['class' => 'navbar is-fixed-top']];
   $navConfig['toggleIcon()'] = ['<span class="icon"><i class="mdi mdi-forwardburger mdi-24px"></i></span>'];
   $navConfig['toggleOptions()'] = [['class' => 'navbar-item is-hidden-desktop jb-aside-mobile-toggle']];

   if ($app->get('app.nav.logged') !== []) {
       $menuItems = $app->get('app.nav.logged');
   }

   $label = '';

   foreach ($menuItems as $key => $item) {
       $label = strtr($item['label'], [
           '{logo}' => Html::img($aliases->get('@web/images/icon-avatar.png')),
           '{username}' => $identity->getIdentity()->username
       ]);

       if ($label !== '') {
           $menuItems[$key]['label'] = $label;
       }
   }
} else {
   $menuItems =  $app->get('app.nav.guest');
}
?>

<?= NavBar::begin($navConfig)->start(); ?>

   <?= Nav::widget()
       ->currentPath($url->generate($urlMatcher->getCurrentRoute()->getName()))
       ->items($menuItems)
   ?>

<?= NavBar::end();

username change dinamic

example for nav widget screen.

If I follow your code correctly, you just set contents of the label while configuring. Have a look at https://github.com/yiisoft/form/issues/17#issuecomment-671565268

Terabytesoftw Also as far as I see your example is for custom widget. But I'm talking about reusing Field widget as it is ok and I need just small part to be dynamic.

It's normal yiisoft/yii-bulma widget is not custom, just configure it.

Well you can add a dynamic tag method to widgets, it can be good.

$field->config($form, 'email')
   ->label(false)
   ->textInput(['required' => true])
   ->dinamicTags(['template', ['{dynamic}' => 'Here goes dynamic contents']])

Yes, but I just want to point out that I don't need custom widget. Yes, I know I can do anything in my widget. But I'm just using Yiisoft\Form\Widget\Field which is ok by itself. And we were discussing that it is not extendable. I just want to have a dynamic part in it. So for that you are proposing to create my widget, copy paste all the code from Yiisoft\Form\Widget\Field and add my custom part there afterwards.

But I propose just to add a way of defining dynamic (custom) parts to Yiisoft\Form\Widget\Field to make it more extendable.

Well, but I like the idea of the dynamicTags, to make a method, passing the place where it will be replaced and the value, it would be very good.

If you are ok with my points mentioned in issue (1-6), I will prepare PRs for them (each separately).