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I select "Configuration type" as a Block and select my custom block to export the configuration from development/configuration/single/export, I got following configurations in Visibility of block.

If I want to set visibility programmatically, how can I do this?

visibility:
  _menu_position:
    id: _menu_position
    _menu_position:
      'main:menu_link_content:016650bb-ecd4-43e4-9d04-fef05ebcf186': 'main:menu_link_content:016650bb-ecd4-43e4-9d04-fef05ebcf186'
      'main:menu_link_content:2d195963-d98d-4f02-8129-6498c5db4b87': 'main:menu_link_content:2d195963-d98d-4f02-8129-6498c5db4b87'

For this, I have used following function,

function placeBlock(EntityInterface $entity) {

    $config = \Drupal::configFactory();
    $settings = [
        'plugin' => '_block_module_block', // Set the plugin id
        'region' => 'header', // Set region to header
        'id' => $entity->id() . '-_bm_autoheader', // Use the page id and the module name for machine name
        'theme' => $config->get('system.theme')->get('default'),
        'label' => $entity->label(), // Use the page label
        'visibility' => [],
        'weight' => 0,
        'label_display' => 0, // disable label
        'page_id' => $entity->id(), // Reference page
    ];
    $values = [];
    foreach (['region', 'id', 'theme', 'plugin', 'weight', 'visibility'] as $key) {
        $values[$key] = $settings[$key];
        // Remove extra values that do not belong in the settings array.
        unset($settings[$key]);
    }

    foreach ($values['visibility'] as $id => $visibility) {
         $values['visibility'][$id]['id'] = $id;
    }

    $values['settings'] = $settings;
    $block = Block::create($values);
    $block->save();
}

In my case, $visibility array getting null.

langcode: de
status: true
dependencies:
  module:
    - _block_module
  theme:
    - _drupal_theme
id: 57148-_bm_autoheader
theme: _drupal_theme
region: header
weight: 0
provider: null
plugin: _block_module_block
settings:
  id: _block_module_block
  label: 'Header Contact'
  provider: _block_module
  label_display: '0'
  page_id: '57148'
visibility: {  }

'visibility' => [],

Need help to understand the Visibility portion of the block. How it works in D8 and how we can set programmatically?

Thanks in advance.

1

I have found the solution, set the visibility configuration by the following function using $menuLinkItem->uuid().

function setVisibilityConfig($instance_id, array $configuration)

$block->setVisibilityConfig('_menu_position', array('id' => '_menu_position',
        '_menu_position'=> [
              'main:menu_link_content:'.$menuLinkItem->uuid() => 'main:menu_link_content:'.$menuLinkItem->uuid()
            ],
        'negate' => null,
        )
    );

Thanks, @SumitMadan for helping out to understand the visibility concept.

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