how to get data from provider and filter it in my flutter application
this is my catagory widget when u press it , i want it to filter my data with catagoryId i wanna pass filtered data to item screen . how ever i keep getting errors. i have created a method that hold catagory Id and pass it to set getOnlineItem() method to only show subcagory that thier catagory i matches
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/src/widgets/container.dart';
import 'package:flutter/src/widgets/framework.dart';
import 'package:onlineshoping1/Assets/colors.dart';
import 'package:onlineshoping1/screans/item.dart';
import 'package:provider/provider.dart';
import '../provider/provider.dart';
class CatagoriesCard extends StatefulWidget {
final dynamic listt;
const CatagoriesCard({this.listt});
@override
State<CatagoriesCard> createState() => _CatagoriesCardState();
}
class _CatagoriesCardState extends State<CatagoriesCard> {
@override
Widget build(BuildContext context) {
dynamic catagory;
initState() {
OnlineShopingProvider provider =
Provider.of<OnlineShopingProvider>(context, listen: false);
setState(() {
catagory = provider.datalist.where((element) {
return element['catagory_id'] == widget.listt;
}).toList();
});
}
setCategory(catagoryId) {
OnlineShopingProvider provider = Provider.of(context, listen: false);
provider.setCategory(catagoryId);
}
return GestureDetector(
onTap: () {
print(widget.listt);
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => Item(
list: widget.listt['catagory_id'],
)),
);
},
child: Container(
width: double.infinity,
height: 110,
margin: EdgeInsets.only(top: 20),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10),
boxShadow: const [
BoxShadow(
color: Colors.grey,
blurRadius: 5,
offset: Offset(0, 5),
)
]),
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Container(
height: 110,
width: 110,
margin: EdgeInsets.only(right: 20),
decoration: BoxDecoration(
color: tdgrey,
borderRadius: BorderRadius.circular(10),
),
child: Image.network('${widget.listt['catagory_img']}'),
),
Text(
'${widget.listt['catagory_name']}',
style: TextStyle(fontSize: 15),
),
],
),
)),
);
}
}
and this is my provider class
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:onlineshoping1/screans/item.dart';
class OnlineShopingProvider with ChangeNotifier {
int _selectedCategory = 0;
final dynamic _data = [
{
'catagory_id': '1',
'catagory_name': 'shoe',
'catagory_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
},
{
'catagory_id': '2',
'catagory_name': 'clothes',
'catagory_img':
'https://www.freevector.com/uploads/vector/preview/1761/FreeVector-Womens-Clothes-Silhouettes.jpg',
},
];
final dynamic _item = [
{
'item_name': 'addidass',
'item_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
'price': '4000',
'catagory_id': '1',
'item_description':
" is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,"
},
{
'item_name': 'nike',
'item_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
'price': '3000',
'catagory_id': '1',
'item_description':
" is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,"
},
{
'item_name': 'reebok',
'item_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
'price': '2000',
'catagory_id': '1',
'item_description':
" is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,"
},
{
'item_name': 'chanel',
'item_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
'price': '2000',
'catagory_id': '2',
'item_description':
" is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,"
},
{
'item_name': 'CUCCI',
'item_img':
'https://thumbs.dreamstime.com/b/gadgets-accessories-gadgets-accessories-isolated-white-background-133429004.jpg',
'price': '2000',
'catagory_id': '2',
'item_description':
" is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries,"
},
];
List cart = [];
get datalist => _data;
get items => _item;
getOnlineItem() {
if (_selectedCategory == null) {
return _item;
} else {
return _item.where((e) => e['category_id'] == _selectedCategory).toList();
}
}
void setCategory(id) {
_selectedCategory = id;
notifyListeners();
}
}
Firstly, please, fix grammar errors, because in _item map you have "catagory_id", while in the getOnlineItem method you are using "category_id". I would recommend you to use data classes instead of maps.
Try to not use dynamic, please, always specify data type, when you can do it.
In the getOnlineItem method you are checking equality of two different data types.
return _item.where((e) => e['category_id'] == _selectedCategory).toList();
you are comparing e['category_id'] which is a String with _selectedCategory which is an int. So you have to either change data type of _selectedCategory to String or use toString() method. So you have the following code:
getOnlineItem() {
if (_selectedCategory == null) {
return _item;
} else {
return _item.where((e) => e['catagory_id'] == _selectedCategory.toString()).toList();
}
}