I new to Flutter and i was trying to find a solution for the below issue for several hours. I have searched and every solution provided does not work form me.
I have page where one of the widgets is the autocomplete text input. I have created this autocomplete widget on different class. I have added this widget as StatefulBuilder within my main widget. it is working fine however, i am not able to access its value so I can store it with other fields.
My code look like
class ItemDetails extends StatefulWidget {
const ItemDetails({Key? key}) : super(key: key);
static const routeName = '/item_details';
@override
State<ItemDetails> createState() => _ItemDetails();
}
class _ItemDetails extends State<ItemDetails> {
late TextEditingController labelController;
late TextEditingController valueController;
late TextEditingController notesController;
bool _submitted = false;
late var args;
String _itemLabel2 = "";
// var labelAutoComp = LabelSugg();
@override
void initState() {
super.initState();
labelController = TextEditingController();
valueController = TextEditingController();
notesController = TextEditingController();
}
@override
void dispose() {
labelController.dispose();
valueController.dispose();
notesController.dispose();
// Hive.close();
super.dispose();
}
String? _labelErrorText(context) {
final text = labelController.value.text;
if (text.isEmpty) {
// return 'Can\'t be empty';
return AppLocalizations.of(context)!.noEmpty;
}
}
String? _valueErrorText(context) {
final text = valueController.value.text;
if (text.isEmpty) {
// return 'Can\'t be empty';
return AppLocalizations.of(context)!.noEmpty;
}
}
@override
Widget build(BuildContext context) {
try {
args = ModalRoute.of(context)!.settings.arguments as Map;
} on Exception catch (e) {
// print(e);
}
// print(args);
return Scaffold(
appBar: AppBar(
title: Text(args['title']),
),
body: Container(
padding: const EdgeInsets.all(20),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(20),
child: Column(
// mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
LabelSugg(getLabelText: (String val) {
print(val);
_itemLabel2 = val;
}),
TextField(
autofocus: true,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.label,
hintText: AppLocalizations.of(context)!.labelHint,
errorText:
_submitted ? _labelErrorText(context) : null,
),
controller: labelController,
onChanged: (_) => setState(() {}),
),
const SizedBox(height: 5),
TextField(
autofocus: false,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.value,
hintText: AppLocalizations.of(context)!.valueHint,
errorText:
_submitted ? _valueErrorText(context) : null,
),
controller: valueController,
keyboardType: const TextInputType.numberWithOptions(
decimal: true, signed: false),
inputFormatters: <TextInputFormatter>[
FilteringTextInputFormatter.allow(
RegExp(r"[0-9.]")),
TextInputFormatter.withFunction(
(oldValue, newValue) {
try {
final text = newValue.text;
if (text.isNotEmpty) double.parse(text);
return newValue;
} catch (e) {}
return oldValue;
}),
], // Only numbers can be entered
onChanged: (_) => setState(() {}),
),
const SizedBox(height: 5),
TextField(
autofocus: true,
decoration: InputDecoration(
labelText: AppLocalizations.of(context)!.notes,
hintText: AppLocalizations.of(context)!.noteHint,
),
controller: notesController,
onChanged: (_) => setState(() {}),
),
]),
// ],
),
Expanded(
child: Align(
alignment: FractionalOffset.bottomCenter,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton.icon(
onPressed: () {
setState(() => _submitted = true);
if (_labelErrorText(context) == null &&
_valueErrorText(context) == null) {
//insert
var localLabel = labelController.value.text;
var _localValue = 0.0;
if (valueController.value.text != '') {
_localValue =
double.parse(valueController.value.text);
} else {
_localValue = 0.0;
}
var localNotes = notesController.value.text;
addItemToList(
localLabel, _localValue, localNotes);
Navigator.of(context).pop();
labelController.clear();
valueController.clear();
notesController.clear();
}
},
label: Text(AppLocalizations.of(context)!.add),
icon: const Icon(Icons.save, size: 18),
),
const SizedBox(width: 10),
ElevatedButton.icon(
onPressed: () => {Navigator.pop(context)},
label: Text(AppLocalizations.of(context)!.cancel),
icon: const Icon(Icons.cancel, size: 18),
),
],
)),
),
// )
],
)));
}
void addItemToList(String localLabel, double localValue, String localNotes) {
var _item = YearItems()..yearID = args['year'];
_item.itemLabel = localLabel;
_item.itemValue = localValue;
_item.itemNote = localNotes;
print(_itemLabel2);
final itemsBox = ItemsBoxes.getTransactions();
itemsBox.add(_item);
}
}
my labelAutoComp widget code look like
class LabelSugg extends StatefulWidget {
final ValueChanged<String> getLabelText;
const LabelSugg({Key? key, required this.getLabelText}) : super(key: key);
@override
State<LabelSugg> createState() => _LabelSugg();
}
class _LabelSugg extends State<LabelSugg> {
late TextEditingController fieldTextEditingController2;
@override
void initState() {
super.initState();
}
@override
void dispose() {
super.dispose();
}
getLabel() {
return widget.getLabelText(fieldTextEditingController2.text);
}
@override
Widget build(BuildContext context) {
List<LabelsAc> labelOptions = <LabelsAc>[
LabelsAc(label: AppLocalizations.of(context)!.labelClothes),
LabelsAc(label: AppLocalizations.of(context)!.labelFood),
LabelsAc(label: AppLocalizations.of(context)!.labelPerfumes),
LabelsAc(label: AppLocalizations.of(context)!.labelCapital),
];
return Autocomplete<LabelsAc>(
optionsBuilder: (TextEditingValue textEditingValue) {
return labelOptions
.where((LabelsAc _label) => _label.label
.toLowerCase()
.startsWith(textEditingValue.text.toLowerCase()))
.toList();
},
displayStringForOption: (LabelsAc option) => option.label,
fieldViewBuilder: (BuildContext context,
TextEditingController fieldTextEditingController,
// fieldTextEditingController,
FocusNode fieldFocusNode,
VoidCallback onFieldSubmitted) {
return TextField(
controller: fieldTextEditingController,
focusNode: fieldFocusNode,
style: const TextStyle(fontWeight: FontWeight.bold),
// onChanged: getLabel(),
onChanged: (String val) {
fieldTextEditingController2 = fieldTextEditingController;
getLabel();
});
},
onSelected: (LabelsAc selection) {
fieldTextEditingController2 =
TextEditingController(text: selection.label);
getLabel();
},
optionsViewBuilder: (BuildContext context,
AutocompleteOnSelected<LabelsAc> onSelected,
Iterable<LabelsAc> options) {
return Align(
alignment: Alignment.topLeft,
child: Material(
child: Container(
// width: 350,
// color: Colors.cyan,
child: ListView.builder(
padding: const EdgeInsets.all(10.0),
itemCount: options.length,
itemBuilder: (BuildContext context, int index) {
final LabelsAc option = options.elementAt(index);
return GestureDetector(
onTap: () {
onSelected(option);
},
child: ListTile(
title: Text(option.label,
style: const TextStyle(color: Colors.black)),
),
);
},
),
),
),
);
},
);
// ),
// );
}
}
class LabelsAc {
LabelsAc({required this.label});
String label;
}
CodePudding user response：
first is redundant when you wrap your
classthat extendStatefullWidgetwithStatefullBuilder.LabelSuggis a component Widget. you can use it like other widget.benefit to separate widget with
StatefullWidgetclass is, we can update the value inside the class without re-build the current page. which is good for performance. that's why developer recomend to separete with class insted compared to make local method.as you see, when you create
LabelSuggextendStatefullWidgetclass , we will have_LabelSugg. underscore means that: all variable only accessible on current file. thats why we can't callgetLabel()or other variable from different file. its used for handle theStatein 'LabelSugg` widget.
now how to pass the value from LabelSugg is by created variable outside the state. here you are:
class LabelSugg extends StatefulWidget {
// use this to pass any changes when we use LabelSugg
final ValueChanged<String> getLabelText;
const LabelSugg({Key? key, required this.getLabelText}) : super(key: key);
@override
State<LabelSugg> createState() => _LabelSugg();
}
then we can call the onChaged inside _LabelSugg state. because its Statefull widget, we can acces by : widget.getLabelText()
class _LabelSugg extends State<LabelSugg> {
late TextEditingController fieldTextEditingController;
.....
getLabel() {
return widget.getLabelText(fieldTextEditingController.text);
}
then in other class we call LabelSugg like common widget
import 'package:../labelsug.dart';
class ItemDetails extends StatefulWidget {
.....
return Scaffold(
appBar: AppBar(
title: Text(args['title']),
),
body: Container(
padding: const EdgeInsets.all(20),
child: Column(
children: <Widget>[
// now use it like a widget
LabelSug(
getLabelText: (String val){
print(val);
}
:)