How to display variable from json return in text - dart

Question

String empName;
Future<List> getUserData() async{
final response = await http.post("http://172.16.161.34:8080/ebs/cfs/android_test_app/accessfile.php?q=getUserData",body:{
"emp_id": widget.empId,
});
var dataUser = jsonDecode(response.body);
empName = dataUser[0]['name'];
return null;
}
How to display the variable "empName" in line 2 to line 70 "child: Text('')"
Full code on Pastebin

Answer 1

Try this way.. make pojo class for response data like this way..
class UserData {
final int albumId;
final int id;
final String title;
final String url;
final String thumbnailUrl;
UserData({this.albumId, this.id, this.title, this.url, this.thumbnailUrl});
factory UserData.fromJson(Map<String, dynamic> json) {
return new UserData(
albumId: json['albumId'],
id: json['id'],
title: json['title'],
url: json['url'],
thumbnailUrl: json['thumbnailUrl']);
}
}
make method for api call..
Future<UserData> fetchData() async {
var result = await get('https://jsonplaceholder.typicode.com/photos');
if (result.statusCode == 200) {
return UserData.fromJson(json.decode(result.body));
} else {
// If that response was not OK, throw an error.
throw Exception('Failed to load post');
}
}
after that make global object that fetch data..
Future<UserData> userDataList;
on Button click ..
userDataList = fetchData();
after that you want to print data..
userDataList.then((userData){
print(userData.title);
});

Answer 2

First of all you getUserData() function never returns anything. It seems like you only need the name so this function could look like this:
Future<String> getUserData() async{
final response = await http.post("http://172.16.161.34:8080/ebs/cfs/android_test_app/accessfile.php?q=getUserData",body:{
"emp_id": widget.empId,
});
var dataUser = jsonDecode(response.body);
return dataUser[0]['name'];
}
Then to set the empName variable you should use setState().
So change your afterFirstLayout() method to this:
#override
void afterFirstLayout(BuildContext context) async {
// Calling the same function "after layout" to resolve the issue.
getUserData().then( (userName) {
setState(() {
empName = userName;
});
});
}
Also you seem to want to reload the name once you press the IconButton.
So you might want to override your code with this:
IconButton(icon: Icon(Icons.shopping_cart),
onPressed:() {
getUserData().then( (userName) {
setState(() {
empName = userName;
});
});
},
),