create widget for each item in the list in Flutter Dart

Question

I am populating an array from json data in Dart

 String url="http://someapi.com/words";
    List<Word> words=new List<Word>();
    final res = await http.get(url, headers: {"Accept": "aplication/json"});
    final wordsList = json.decode(res.body);
    for (var h in wordsList) {
      Word word = new Word(title: h['title'].toString());
      words.add(word);
    }

This gives me a list of Words. Now how can I use it in the widget? Below is the code that I currently have

 @override
  Widget build(BuildContext context) {
    final response=fetchWords(); //this response will have list of words
      return new Container(
        padding: new EdgeInsets.symmetric(vertical: 15.0,
        horizontal: 15.0),
        child: Column(children: <Widget>[ 
          new Row(
            children: <Widget>[ 
             //I want to add a container for each for words here 
            ],
          )
         ])
         );

I tried following this, but I am not sure how to convert the json array into widgets

Aawaz Gyawali · Accepted Answer · 2019-05-07 16:26:37Z

8

Use map function.

Example:

Row(
  children: words.map<Widget>((word)=>Container(child: Text(word))).toList()
);

answered May 7, 2019 at 16:26

Aawaz Gyawali

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1 Comment

Bliv_Dev Over a year ago

Don't forget the .toList() ad the end of the .map<> . Totally oversaw this on the first reading :)

Doc · Accepted Answer · 2020-10-22 10:09:12Z

7

Just use map with toList()

Row(
  children: words.map((word)=> Text(word)).toList()
);

map will take one word at a time

=> is short for return so you could have written

Row(
   children: words.map((word){
                returnText(word)}
                ).toList()
  );

Lastly, Row expects a List of widgets whereas map gives an Iterable thus we use toList() to get a list of widgets.

EDIT:

If you need to access the index of element, then

class MyWidget extends StatelessWidget {
  final words = ['foo', 'bar', 'baz'];
  @override
  Widget build(BuildContext context) {
    return ListView(
      children: words
          .asMap()
          .entries
          .map(
            (e) => Text("${e.value} at index ${e.key}"),
          )
          .toList(),
    );
  }
}

edited Oct 22, 2020 at 10:09

answered May 7, 2019 at 16:35

Doc

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2 Comments

user3808307 Over a year ago

Is there a way to get the index in the mapping? for example in react you could do words.map((word, idx) and idx is the index

Forke Over a year ago

@user3808307 yes, there also is a mapIndexed function that provides the index and the item at that index.

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