Apologies for the confusion. If you're specifically looking for a widget that displays a tree structure with dropdowns for each group in Flutter, you can use the flutter_treeview package. This package provides a TreeView widget that allows…

.htaccessに以下を追加したけど、、PHP側にはpostじゃなくて、optionリクエストが飛んでくるなぁ、、これてapache側でなんとかならんのか？ Header set Access-Control-Allow-Origin "*" Header Set Access-Control-Allow-Headers "Origin, X-Requested-With…