I am building my first Flutter app and I am trying to filter a list of TreeTypes in Flutter with GetX using a TextFormField.
So the list is pulled from an API and I want to filter it in realtime using the TreeTypeController.filterTreeTypes(earchString) method.
It works in part. The results that do not contain the searchString are filtered out like they should but when I use backspace on the searchString, the removed items are not put back into the list.
I understand that I somehow need to make a clone of filteredTreeTypeList instead of filtering that and then overwriting it with the results but I just can't figure out how to do that. I have tried creating a new List with map and other ways I found on the interwebs but I keep getting the same problem.
Can someone please show me how to do it? Thank you!
Below are my GetxController and my view/screen.
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:bonsai_care_app/services/tree_type_service.dart';
import 'package:bonsai_care_app/models/tree_type.dart';
class TreeTypeController extends GetxController {
dynamic arguments = Get.arguments;
var treeTypeList = <TreeType>[].obs;
var isLoaded = true.obs;
@override
void onInit() {
super.onInit();
fetchAndSetTreeTypeList(arguments);
}
void filterTreeTypes(searchString) {
var filteredTreeTypeList = [];
filteredTreeTypeList = treeTypeList
.where((element) =>
element.name.toLowerCase().contains(searchString.toLowerCase()))
.toList();
print(filteredTreeTypeList.length);
treeTypeList(filteredTreeTypeList);
}
Future<void> fetchAndSetTreeTypeList(arguments) async {
debugPrint('TreeTypesController fetchTreeTypes()');
try {
isLoaded(false);
var tree_types = await TreeTypeService().fetchTreeTypes(arguments);
if (tree_types != null) {
treeTypeList(tree_types);
}
} catch (error) {
debugPrint(error);
throw (error);
} finally {
isLoaded(true);
}
}
}
import 'package:get/get.dart';
import 'package:flutter/material.dart';
import 'package:bonsai_care_app/controllers/tree_type_controller.dart';
import 'package:bonsai_care_app/views/select_tree_type_details_screen.dart';
class SelectTreeTypeResultsScreen extends StatelessWidget {
final TreeTypeController treeTypeController = Get.put(TreeTypeController());
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('select_tree_type_results__heading'.tr),
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Obx(
() {
return Column(
children: [
Container(
child: TextFormField(
onChanged: (query) {
treeTypeController.filterTreeTypes(query);
},
decoration: InputDecoration(
labelText:
'select_tree_type_results__search_input_label'.tr,
border: const OutlineInputBorder(),
),
),
),
Container(
height: 500,
width: 200,
child: Visibility(
visible: treeTypeController.isLoaded.value,
replacement: Center(
child: CircularProgressIndicator(),
),
child: treeTypeController.treeTypeList.length == 0
? Center(
child: Text('no_results'.tr),
)
: ListView.builder(
itemCount: treeTypeController.treeTypeList.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(treeTypeController
.treeTypeList[index].name),
onTap: () {
Get.to(() => SelectTreeTypeDetailsScreen(),
arguments: treeTypeController
.treeTypeList[index]);
},
);
},
),
),
),
],
);
},
),
],
),
);
}
}
CodePudding user response:
Declare an other list in the controller:
List<TreeType> treeList = [];
And initialise it in your api call:
treeList = tree_types;
And finally update your search function:
void filterTreeTypes(searchString) {
treeTypeList.value = treeList
.where((element) =>
element.name.toLowerCase().contains(searchString.toLowerCase()))
.toList();
}