This PR adds the fancy select functionality to Joomla's core ''Access'' fields.

Summary of Changes

Joomla is suitable for large websites. On such large websites, you can have many User Groups and Viewing Access Levels. When there are many Viewing Access Levels, assigning content to the right Access Level is hard. This PR adds a fancy select feature to the Access field in the back-end forms to make it easier to select the right Access Level.

Testing Instructions

Add a lot of Viewing Access Levels to the website, e.g. using this SQL query:

INSERT INTO `#__viewlevels` (`id`, `title`, `ordering`, `rules`) VALUES
(7, 'Marketing', 5, '[]'),
(8, 'Legal department', 6, '[]'),
(9, 'Research & Development', 7, '[]'),
(10, 'Finance', 8, '[]'),
(11, 'Sales', 9, '[]'),
(12, 'Customer Service', 10, '[]'),
(13, 'Human Resources', 11, '[]'),
(14, 'IT', 12, '[]'),
(15, 'Maintenance department', 13, '[]'),
(16, 'Quality management', 14, '[]'),
(17, 'Operations management', 15, '[]'),
(18, 'Performance management', 16, '[]'),
(19, 'Account department', 17, '[]'),
(20, 'Purchasing', 18, '[]'),
(21, 'Communications', 19, '[]');

Check the Access field in the forms when you create a new item or edit an existing one on these pages:

• Articles
  /administrator/index.php?option=com_content&view=articles
• Articles: Categories
  /administrator/index.php?option=com_categories&view=categories&extension=com_content
• Articles: Fields
  /administrator/index.php?option=com_fields&view=fields&context=com_content.article
• Articles: Field Groups
  /administrator/index.php?option=com_fields&view=groups&context=com_content.article
• Modules (Site)
  /administrator/index.php?option=com_modules&view=modules&client_id=0
• Modules (Administrator)
  /administrator/index.php?option=com_modules&view=modules&client_id=1
• Menus: All Menu Items
  /administrator/index.php?option=com_menus&view=items&menutype=
• Contacts
  /administrator/index.php?option=com_contact&view=contacts
• News Feeds
  /administrator/index.php?option=com_newsfeeds&view=newsfeeds
• Tags
  /administrator/index.php?option=com_tags&view=tags
• lugins
  /administrator/index.php?option=com_plugins&view=plugins
• Guided Tours
  /administrator/index.php?option=com_guidedtours&view=tours
• Languages: Content
  /administrator/index.php?option=com_languages&view=languages
• Global Configuration (Default Access Level)
  /administrator/index.php?option=com_config

Actual result BEFORE applying this Pull Request

Go to Content > Articles /administrator/index.php?option=com_content&view=articles > Edit or New
The Access field is a large dropdown list with all Viewing Access Levels ordered by ordering.

Expected result AFTER applying this Pull Request

Go to Content > Articles /administrator/index.php?option=com_content&view=articles > Edit or New
The Access field is a smaller dropdownlist with the advanced searchable options feature.
Type a part of a name to filter the options.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed