flutter search in search - flutter

Question

This is the onsearch function that searches for all custnum addresses.
onSearch(String text) async {
print(text);
List<Item> itemII = items;
if (text.isNotEmpty) {
List<Item> itemList = [];
for (var item in itemII) {
if (item.custnum == text.toLowerCase().toUpperCase()) {
itemList.add(item);
}
}
setState(() {
searchText = text;
searchitems.clear();
searchitems.addAll(itemList);
MainPage.searchItemMainPage.addAll(itemList);
if (searchitems.isNotEmpty) {
print({MainPage.searchItemMainPage[0].address});
searchitems[0].address!.sort((a, b) {
if (a.for_bill == 'Y' && b.for_bill == 'N') {
return -1;
} else if (a.for_bill == 'N' && b.for_bill == 'Y') {
return 1;
} else if (a.for_ship == 'Y' && b.for_ship == 'N') {
return -1;
} else if (a.for_ship == 'N' && b.for_ship == 'Y') {
return 1;
} else if (a.for_contact == 'Y' && b.for_contact == 'N') {
return -1;
} else if (a.for_contact == 'N' && b.for_contact == 'Y') {
return 1;
} else {
return 0;
}
});
}
});
} else {
setState(() {
searchCus.clear();
searchitems.clear();
MainPage.searchItemMainPage.clear();
// searchitems.addAll(items);
print('searchitems : $searchitems');
});
}
}
This is the onsearchaddr function, it finds the address in searchitems after the search. By typing the name of the field addr, then the address will be displayed.
onSearchAddr(String text) {
List<Item> result = searchitems;
if (text.isNotEmpty) {
List<Item> itemList = [];
for (var item in result) {
item.address = item.address!
.where((element) =>
element.addr1!.toUpperCase().toLowerCase().contains(text))
.toList();
itemList.add(item);
}
setState(() {
searchitems.clear();
searchitems.addAll(itemList);
print('itemList : ${itemList}');
});
} else {
setState(() {
searchitems.clear();
searchitems.addAll(MainPage.searchItemMainPage);
print(
'SearchitemsMainPage : ${MainPage.searchItemMainPage[0].address}');
});
}
}
Could you please write some code to modify onsearchaddr, it can search as typed but when it clears text it doesn't show information of searchitems as before but it shows information of last typed message.
It's like the previous backup wasn't provided.