I am using a TextField
under which onChanged
function
I am calling my code but the issue right now is the code gets execute everytime a new word is either entered or deleted.
what I am looking for is how to recognize when a user has stopped typing.
means adding some delay or something like that.
I have tried adding delay
also using Future.delayed
function but that function also gets executed n number of times.
TextField(
controller: textController,
onChanged: (val) {
if (textController.text.length > 3) {
Future.delayed(Duration(milliseconds: 450), () {
//code here
});
}
setState(() {});
},
)
Thanks to @pskink
I was able to achieve the functionality I was looking for.
import stream_transform package in your pubspec.yaml
stream_transform: ^0.0.19
import 'package:stream_transform/stream_transform.dart';
StreamController<String> streamController = StreamController();
@override
void initState() {
streamController.stream
.transform(debounce(Duration(milliseconds: 400)))
.listen((s) => _validateValues());
super.initState();
}
//function I am using to perform some logic
_validateValues() {
if (textController.text.length > 3) {
// code here
}else{
// some other code here
}
}
TextField code
TextField(
controller: textController,
onChanged: (val) {
streamController.add(val);
},
)