Range error

[akhilpune]

When the data of list is dynamically updating, if (previous list length)<(updated list length). The widget throws a range error

[diegoveloper]

Hello, please add a simple sample to reproduce the error.

Thanks

On Tue, May 5, 2020, 8:36 AM akhilpune [email protected] wrote:

When the data of list is dynamically updating, if (previous list length)<(updated list length). The widget throws a range error

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[Work90210]

I am also getting a range error...

Here is a sample code.

return StreamBuilder<QuerySnapshot>( stream: _firestore .collection("users") .doc(firebaseUser.uid) .collection('location') .snapshots(), builder: (context, snapshot) { snapshot.data.docs.forEach((result) { docID.add(result.reference.id); print(result.data()); }); List<Location> locationData = []; for (var cards in snapshot.data.docs) { Location location = new Location( name: cards.data()['name'], lat: cards.data()['lat'], lng: cards.data()['lng']); locationData.add(location); } List<Widget> _buildItems() { return locationData .map((item) => MySelectionItem( title: item.name, )) .toList(); }

     ` return DirectSelect(
          itemExtent: 35.0,
          selectedIndex: selectedIndex,
          backgroundColor: Colors.red,
          child: MySelectionItem(
            isForList: false,
            title: locationData[selectedIndex].toString(),
          ),
          onSelectedItemChanged: (index) {
            selectedIndex = index;
          },
          mode: DirectSelectMode.tap,
          items: _buildItems());
    });

} }`

`class MySelectionItem extends StatelessWidget { final String title; final bool isForList;

const MySelectionItem({Key key, this.title, this.isForList = true}) : super(key: key);

@override Widget build(BuildContext context) { return SizedBox( height: 60.0, child: isForList ? Padding( child: _buildItem(context), padding: EdgeInsets.all(10.0), ) : Card( margin: EdgeInsets.symmetric(horizontal: 10.0), child: Stack( children: <Widget>[ _buildItem(context), Align( alignment: Alignment.centerRight, child: Icon(Icons.arrow_drop_down), ) ], ), ), ); }`

_buildItem(BuildContext context) { return Container( width: MediaQuery.of(context).size.width, alignment: Alignment.center, child: Text(title), ); } }

Thanks in advanced

[diegoveloper]

Try recreating the issue in a smaller example, don't include another package/library.

On Wed, Feb 10, 2021 at 11:09 AM Kyle Fuhri [email protected] wrote:

I am also getting a range error...

Here is a sample code.

`return StreamBuilder( stream: _firestore .collection("users") .doc(firebaseUser.uid) .collection('location') .snapshots(), builder: (context, snapshot) { snapshot.data.docs.forEach((result) { docID.add(result.reference.id); print(result.data()); }); List locationData = []; for (var cards in snapshot.data.docs) { Location location = new Location( name: cards.data()['name'], lat: cards.data()['lat'], lng: cards.data()['lng']); locationData.add(location); } List _buildItems() { return locationData .map((item) => MySelectionItem( title: item.name, )) .toList(); }

  return DirectSelect(
      itemExtent: 35.0,
      selectedIndex: selectedIndex,
      backgroundColor: Colors.red,
      child: MySelectionItem(
        isForList: false,
        title: locationData[selectedIndex].toString(),
      ),
      onSelectedItemChanged: (index) {
        selectedIndex = index;
      },
      mode: DirectSelectMode.tap,
      items: _buildItems());
});

} }

class MySelectionItem extends StatelessWidget { final String title; final bool isForList;

const MySelectionItem({Key key, this.title, this.isForList = true}) : super(key: key);

@override https://github.com/override Widget build(BuildContext context) { return SizedBox( height: 60.0, child: isForList ? Padding( child: _buildItem(context), padding: EdgeInsets.all(10.0), ) : Card( margin: EdgeInsets.symmetric(horizontal: 10.0), child: Stack( children: [ _buildItem(context), Align( alignment: Alignment.centerRight, child: Icon(Icons.arrow_drop_down), ) ], ), ), ); }

_buildItem(BuildContext context) { return Container( width: MediaQuery.of(context).size.width, alignment: Alignment.center, child: Text(title), ); } }`

Thanks in advanced

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