How to pass variable to global variable from registerEvents

[gzai]

Hi,
I want to pass variable to global variable from registerEvents but when I get value of global variable the result is empty. how to pass variable to global variable from registerEvents?

Laravel 8.4
Laravel Excel 3.1

// Export
class MappingExport implements FromView, WithTitle, WithEvents, WithProperties 
{
    private $master_mapping_data;

    public function __construct() {
        $this->master_mapping_data = collect();
    }

    public function registerEvents(): array
    {
        return [
            AfterSheet::class => function(AfterSheet $event) {
                // calculate cell for header
                $this->master_mapping_data = $cell_header; // collect(['A','B','C']) data cell header
            },
        ];
    }

    public function view(): View
    {
        return view('exports.mapping', [
            // other variable
            'master_mapping_data' => $this->master_mapping_data,
        ]);
    }
}

// View
call master_mapping_data the result is empty

[patrickbrouwers]

After sheet is not executed before the view.

[gzai]

ah right, after sheet gets raised at the end of the sheet process.
looks like I will move this code // calculate cell for header $cell_header to __construct.
thanks @patrickbrouwers