How to add the widgets dynamically to column in Flutter? - flutter

Question

I have added a few widgets inside the ListView. So that I can scroll all widgets. Now I required to add one more widget to the ListView to load the list of comments. I can not add the ListView inside the ListView. And moreover, I do not require the separate scroll for my comments. It should be scroll along with the widgets inside the ListView. So I planned to add the Column instead of ListView. Could any help to add my comments dynamically in the Columns?
new Expanded(
child:
new ListView(
shrinkWrap: true,
children: <Widget>[
// Title
new Padding(padding: const EdgeInsets.only(
top: 10.00, left: 10.00),
child: new Text(
_feed.title, textAlign: TextAlign.start,),
),
// content
new Container(
child: new Text(
_feed.content, textAlign: TextAlign.start,),
),
// Comments List will go here
],
),
),

Answer 1

If you have the comments data already, simply create a List, then pass it to the children property of the Column. Something like:
var commentWidgets = List<Widget>();
for (var comment in comments) {
commentWidgets.Add(Text(comment.text)); // TODO: Whatever layout you need for each widget.
}
…
new Expanded(
child:
new ListView(
shrinkWrap: true,
children: <Widget>[
// Title
new Padding(padding: const EdgeInsets.only(
top: 10.00, left: 10.00),
child: new Text(
_feed.title, textAlign: TextAlign.start,),
),
// content
new Container(
child: new Text(
_feed.content, textAlign: TextAlign.start,),
),
// Comments List will go here
Column(children: commentWidgets,),
],
),
),
If you don't have the comments data already and need to fetch it, use a FutureBuilder to build the UI once the future completes.

Answer 2

Another way:
return Column(
children: [
for(String item in list) Text(item);
]);
You can also mix static and dynamic fields eaisly in this case:
return Column(
children: [
for(String item in list) Text(item),
Text("Static text control"),
]);

Answer 3

By maintaining a reference to the Column object, the .children field/property can be referenced after the Column object has been declared - like so:
Column someColumn = Column(
children: [],
);
someColumn.children.add(Text('Hello 123'));

Answer 4

Currently(2021-06), Flutter 2.x implemented null-safe.
The answer from #Gene Bo should work but needs little modification.
This should work.
var pwdWidgets = <Widget>[];
Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: this.pwdWidgets,
),
ElevatedButton(
onPressed: (){
setState((){
this.pwdWidgets.add(Text("Hello World"),);
});
},
child: Text("click me"),
),

Answer 5

In Addition to #Derek Lakin's Answer which worked for me too, it is also required to call setState(), if you need to update the comments and reload.
var commentWidgets = List<Widget>();
for (var comment in comments) {
commentWidgets.Add(Text(comment.text)); // TODO: Whatever layout you need foreach widget.
}
setState(() {
});

Answer 6

import 'package:flutter/material.dart';
class LoginRegisterPage extends StatefulWidget {
#override
_LoginRegisterPageState createState() => _LoginRegisterPageState();
}
class _LoginRegisterPageState extends State<LoginRegisterPage> {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
title: Text("App"),
),
body: new Container(
margin: EdgeInsets.all(15.0),
child: new Form(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: createInputs() + createButtons(),
),
),
),
);
}
List<Widget> createInputs(){
return{
SizedBox(height: 10.0),
logo(),
SizedBox(height: 20.0),
new TextFormField(
decoration: new InputDecoration(labelText: 'Email'),
),
SizedBox(height: 10.0),
new TextFormField(
decoration: new InputDecoration(labelText: 'Passwors')
),
SizedBox(height: 20.0),
};
}
Widget logo(){
return new Hero(
tag:'hero',
child: new CircleAvatar(
backgroundColor:Colors.transparent,
radius: 110.0,
child: Image.asset("images\logo.PNG"),
),
);
}
List<Widget> createButtons(){
return{
new RaisedButton(
child: new Text("Login", style: new TextStyle(fontSize: 20.0),),
textColor: Colors.pink,
onPressed: () {
},
),
new FlatButton(
child: new Text("Already not have an account?", style: new TextStyle(fontSize: 14.0),),
textColor: Colors.white,
onPressed: () {
},
)
};
}
}

Answer 7

Yes you can add dynamic child on column widgets.
class CategoriesItemWidget extends StatelessWidget {
final List<String> list;
const CategoriesItemWidget({Key? key, required this.list})
: super(key: key);
#override
Widget build(BuildContext context) {
return Column(
children: list
.map((string) => Text(string))
.toList(),
);
}
}