getByKey method
get manage by key, index
use in list form
if you create data by FormGroupManage.createList,can use index
get manage, In fact, list form must use index
param
Implementation
FormGroupItem getByKey(String key, {int? index}) {
String _searchKey = key;
if (index != null) {
_searchKey = '$index.$_searchKey';
}
if (!_list.containsKey(_searchKey)) {
throw ArgumentError('$_searchKey is not exit in manage');
}
return _list[_searchKey]!;
}