Link 

page

Links to internal pages

url

Links to external pages

file

Links to a file

folder

Links to a folder

email

Creates an email link

telephone

Creates a phone link

record

Enables any record link handler that is defined in the LinkHandler API. To enable only a specific custom LinkHandler, add the defined identifier instead.

EXT:my_extension/Configuration/TCA/Overrides/118-tx_myextension_conference-ticket_link.php

<?php

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

defined('TYPO3') or die();

ExtensionManagementUtility::addTCAcolumns('tx_myextension_conference', [
  'ticket_link' => [
    'label' => 'my_extension.db:conference.ticket_link',
    'displayCond' => [
      'AND' => [
        'FIELD:registration_open:REQ:true',
        'FIELD:seats:>:0',
      ],
    ],
    'config' => [
      'type' => 'link',
      'allowedTypes' => ['page', 'url'],
      'appearance' => [
        'browserTitle' => 'my_extension.db:conference.ticket_link.browser_title',
      ],
    ],
  ],
]);
ExtensionManagementUtility::addToAllTCAtypes(
  'tx_myextension_conference',
  'ticket_link',
  '',
  'after:registration_deadline',
);

Copied!

'allowedTypes' => [
  'page',
  // A custom link handler, defined by its identifier
  'my_handler',
],

Copied!

// Allow all link types (or skip this option)
'allowedTypes' => ['*'],

Copied!

Has information about the appearance, namely:

Controls the autocomplete attribute of a given link field. If set to true (default false), adds attribute autocomplete="on" to the email input field allowing browser auto filling the field:

'autocomplete' => true,

Default value set if a new record is created.

For details see fieldControl.

For details see fieldInformation.

Possible keywords: useOrOverridePlaceholder

This property is related to the placeholder property. When defined, a checkbox will appear above the field. If that box is checked, the field can be used to enter whatever the user wants as usual. If the box is not checked, the field becomes read-only and the value saved to the database will be NULL .

If set to true, a checkbox will appear, which by default deactivates the field. In the deactivated state the field is saved as NULL in the database. By activating the checkbox it is possible to set a value. If nothing is entered into the field, then an empty string will be saved and not a NULL .

The database field must allow the NULL value.

Placeholder, containing a default value.

'placeholder' => 'https://example.org',

Renders the field in a way that the user can see the value but cannot edit it.

If set to true a non-empty value is required in the field. Otherwise the form cannot be saved.

By default, all fields of type link are considered searchable. To exclude a field from being searchable, set the following in the field's TCA configuration:

<?php

use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;

defined('TYPO3') or die();

ExtensionManagementUtility::addTCAcolumns('tx_myextension_talk', [
  'recording' => [
    'label' => 'my_extension.db:talk.recording',
    'config' => [
      'type' => 'link',
      'allowedTypes' => ['url'],
      'appearance' => [
        'allowedOptions' => [],
        'enableBrowser' => false,
      ],
      'behaviour' => [
        'allowLanguageSynchronization' => true,
      ],
      'searchable' => false,
    ],
  ],
]);
ExtensionManagementUtility::addToAllTCAtypes(
  'tx_myextension_talk',
  'recording',
  'talk,keynote',
  'before:--div--;core.form.tabs:access',
);

Abstract value for the width of the <input> field. To set the link field to the full width of the form area, use the value 50. Minimum is 10. Default is 30.

Renders a select box with static values next to the input field. When an item is selected, the value replaces the current input value.

items (array)

A list of selectable items. Each item should be an associative array: ['label' => 'Shown label', 'value' => 'storedValue']. The label can be plain text or a label reference.