Joomla! 4.x Coding • Re: Help button in backend: window has no "Back" button

Code:

    public function display($tpl = null)    {        $this->item  = $this->get('Item');        // Check for errors.        if (count($errors = $this->get('Errors')))            throw new Exception(implode("\n", $errors), 500);        $this->addToolbar();        parent::display($tpl);    }        protected function addToolbar()    {           JToolBarHelper::custom('dummyTask', 'arrow-left', 'arrow-left', 'Back', false);        $doc = JFactory::getDocument();        $doc->addScriptDeclaration("            document.addEventListener('DOMContentLoaded', function() {                var button = document.querySelector('#toolbar-arrow-left');                        if (button) {                    if (window.history.length === 1) {                        button.setAttribute('disabled', 'disabled');                        button.setAttribute('aria-disabled', 'true');                        button.classList.add('disabled');                        button.style.pointerEvents = 'none';                     }                    else {                        button.addEventListener('click', function(event) {                            event.preventDefault();                              window.history.back();                         });                    }                }            });        ");        if (JFactory::getUser()->authorise('core.admin', 'com_component_name'))            JToolBarHelper::preferences('com_component_name');        else            JFactory::getApplication()->input->set('hidemainmenu', true);        JToolBarHelper::title(JText::_($this->item->title, 'help'));    }