Module development and code questions

Hi,

I have an ajax callback function in the form submit:

$form['display'] = [
     
      '#type' => 'button',
      '#value' => $this->t('More'),
       '#ajax' => [
        'callback' => 'Drupal\heritage_ui\Controller\HeritageTextContent::metadataDisplay',
        'effect' => 'slide',
        'event' => 'click',
      ],
    ];

I am getting a php warning:

I am facing an issue while uploading image in media library that your image could not retrieve the oEmbed resource.

Help will be appreciated.
 

Hello,

Following code gives me error

"The website encountered an unexpected error. Please try again later.
ParseError: syntax error, unexpected 'public' (T_PUBLIC) in Composer\Autoload\includeFile() (line 41 of modules\custom\rsvplist\src\EnablerService.php)."

Hi,

I don't know how to install correctly the module Address with Drupal 8.

I don't use Ludwig nor Composer.

How to make it using classic ftp ?

Is there anyway to see a content types display modes through jsonapi? This would allow be to configure teaser etc. for display on decoupled Drupal. 

Views UI: Administer views

I need to add anonymous access for this so that views show up on the JSON:API. 

Is this the best method to see my views on /jsonapi?

What are the security concerns that the message is hinting at?