Extending the user settings

Adding fields to the User Settings is done in two steps. First of all, the new fields are added directly to the $GLOBALS['TYPO3_USER_SETTINGS'] array. Then the field is made visible by calling \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addFieldsToUserSettings().

The configuration needs to be put into ext_tables.php.

Here is an example, taken from the "examples" extension:

EXT:examples/ext_tables.php 
$GLOBALS['TYPO3_USER_SETTINGS']['columns']['tx_examples_mobile'] = array(
   'label' => 'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:be_users.tx_examples_mobile',
   'type' => 'text',
   'table' => 'be_users',
);
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addFieldsToUserSettings(
   'LLL:EXT:examples/Resources/Private/Language/locallang_db.xlf:be_users.tx_examples_mobile,tx_examples_mobile',
   'after:email'
);
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The second parameter in the call to addFieldsToUserSettings() is used to position the new field. In this example, we decide to add it after the existing "email" field.

In this example the field is also added to the "be_users" table. This is not described here as it belongs to 'extending the $TCA array'. See label 'extending' in older versions of the TCA-Reference.

And here is the new field in the User Tools > User Settings module:

Extending the User Settings configuration

"On Click" / "On Confirmation" JavaScript Callbacks

To extend the User Settings module with JavaScript callbacks - for example with a custom button or special handling on confirmation, use clickData or confirmData:

EXT:examples/ext_tables.php 
$GLOBALS['TYPO3_USER_SETTINGS'] = [
    'columns' => [
        'customButton' => [
            'type' => 'button',
            'clickData' => [
                'eventName' => 'setup:customButton:clicked',
            ],
            'confirm' => true,
            'confirmData' => [
                'message' => 'Please confirm...',
                'eventName' => 'setup:customButton:confirmed',
            ]
         ],
         // ...
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Events declared in corresponding eventName options have to be handled by a custom static JavaScript module. Following snippets show the relevant parts:

document.querySelectorAll('[data-event-name]')
    .forEach((element: HTMLElement) => {
        element.addEventListener('setup:customButton:clicked', (evt: Event) => {
            alert('clicked the button');
        });
    });
document.querySelectorAll('[data-event-name]')
    .forEach((element: HTMLElement) => {
        element.addEventListener('setup:customButton:confirmed', (evt: Event) => {
            evt.detail.result && alert('confirmed the modal dialog');
        });
    });
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PSR-14 event \TYPO3\CMS\Setup\Event\AddJavaScriptModulesEvent can be used to inject a JavaScript module to handle those custom JavaScript events.