Important: #91132 - Avoid JavaScript in User Settings Configuration options

See Issue #91132

Description

User Settings Configuration options for buttons onClick and onClickLabels (used to generate inline JavaScript onclick event) and confirmData.jsCodeAfterOk (used to execute a JavaScript callback in modal confirmations) should be omitted.

New options clickData.eventName and conformationData.eventName should be used containing an individual event name that has to be handled individually using a static JavaScript module.

This step is advised to reduce the amount of inline JavaScript code towards better support for Content-Security-Policy headers.

Applications having custom changes in $GLOBALS['TYPO3_USER_SETTINGS'] and using mentioned options onClick* or ``confirmData.jsCodeAfterOk`.

The following example show a potential migration path to avoid inline JavaScript.

$GLOBALS['TYPO3_USER_SETTINGS'] = [
    'columns' => [
        'customButton' => [
            'type' => 'button',
            'onClick' => 'alert("clicked the button")',
            'confirm' => true,
            'confirmData' => [
                'message' => 'Please confirm...',
                'jsCodeAfterOk' => 'alert("confirmed the modal dialog")',
            ]
         ],
         // ...

The above configuration can be replace by the the following.

$GLOBALS['TYPO3_USER_SETTINGS'] = [
    'columns' => [
        'customButton' => [
            'type' => 'button',
            'clickData' => [
                'eventName' => 'setup:customButton:clicked',
            ],
            'confirm' => true,
            'confirmData' => [
                'message' => 'Please confirm...',
                'eventName' => 'setup:customButton:confirmed',
            ]
         ],
         // ...

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');
        });
    });

PSR-14 event \TYPO3\CMS\Setup\Event\AddJavaScriptModulesEvent can be used to inject a JavaScript module to handle those custom JavaScript events.