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I would like to had a field link in a custom block. Here is my code to do that :

public function blockForm($form, FormStateInterface $form_state) {

$form['key_1'] = [
    '#title' => $this->t('Key 1 label'),
    '#type' => 'textfield',
    '#default_value' => '',
    '#required' => false,
];

$form['key_2'] = [
    '#title' => $this->t('key 2 link'),
    '#type' => 'link',
];

return $form;

} Now, when I go in admin/structure/block/manage/myblock, I can see my key 1 field. The key 2 is not render. If I change the type for any other (textfield, textarea, file_managed) my field is properly render. The default link module is enabled.

Is the link field type only usable in node form ? I can understand why.

3

You should add the field from the Block Type interface. Either add to the block type that comes with core or create a new one and add your fields.

Also, no, Drupal Fields and Form API elements are two different constructs. That is why 'link' does nothing. It would simply be:

$form['key_2'] = [
    '#title' => $this->t('key 2 link'),
    '#type' => 'url',
];

See: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element%21Url.php/class/Url/8.2.x

But you're creating more work that necessary.

In this context (a form) link pertains to a RenderElement and not a FormElement like url is.

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