How to take an array from user in flutter from text field? - dart

Question

Widget build(BuildContext context) {
TextField XnumField = new TextField(
keyboardType: TextInputType.numberWithOptions(),
decoration: new InputDecoration(labelText: "X array"),
onSubmitted: (String text){
for(i = 0; i < 4; i++){
X[i] = int.parse(text);
}
},
);

Answer 1

Hi,
If you are looking for something like this here you go.
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
home: new DemoScreen(),
));
}
class DemoScreen extends StatefulWidget {
#override
_DemoScreenState createState() => new _DemoScreenState();
}
class _DemoScreenState extends State<DemoScreen> {
List<int> _myList = new List();
TextEditingController _myController = new TextEditingController();
String _result = "";
String _inputList = "";
setSum() {
int sum = 0;
for (int i = 0; i < _myList.length; i++) {
sum += _myList[i];
if (i == 0)
_inputList = "${_myList[i]}";
else
_inputList = _inputList + " + ${_myList[i]}";
}
_result = "$sum";
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Demo App"),
),
body: new Column(
children: <Widget>[
new Container(
margin: new EdgeInsets.symmetric(vertical: 10.0),
child: new Text(
_inputList,
style: new TextStyle(fontSize: 40.0),
),
),
new Container(
margin: new EdgeInsets.symmetric(vertical: 25.0),
child: new Text(
_result,
style: new TextStyle(fontSize: 70.0),
),
),
new Container(
margin: new EdgeInsets.symmetric(horizontal: 50.0),
child: new TextField(
controller: _myController,
keyboardType: TextInputType.number,
onSubmitted: (text) {
setState(() {
_myList.add(int.parse(text));
setSum();
_myController.clear();
});
},
),
)
],
),
);
}
}
Hope it helps :)

Answer 2

Something like ...
import 'dart:core';
List<int> BuildIntArray(String input) {
var outList = new List<int>();
final _delimiter = ',';
final _values = input.split(_delimiter);
_values.forEach((item) {
outList.add(int.parse(item));
});
return outList;
}
Which would ...
import 'package:IntegerArray/IntegerArray.dart' as IntegerArray;
main(List<String> arguments) {
final input = "1,2,3,4,5";
final intInputValues = IntegerArray.BuildIntArray(input);
print (intInputValues);
int sum = 0;
intInputValues.forEach((item) {
sum+=item;
});
print (sum);
}
... do this ...
Observatory listening on http://127.0.0.1:64499/
[1, 2, 3, 4, 5]
15
Process finished with exit code 0
I don't see a "tryParse" to filter out non-numeric values ... but with some validation/error checking you could add to this ...