CODEWITHSUNDEEP
if-statementwidgetdartstateflutter
Charles Jr
Charles Jr

Reputation: 9119

Updating Flutter page after setState()

I have a user follow/unfollow page that searches Firebase for a list of followers and returns a Boolean if their usedID is found...

Future<Null> _friends() async {
    fb.child("users/${userid}/Following/${id}").onValue.listen((Event event) {

        setState((){
          if (event.snapshot.value != null) {
            friends == true;
          } else if (event.snapshot.value == null) {
            friends == false;
          }
        });
    });
  }

The bool is then set in a separate function that changes a public bool...

bool friends;

The trouble is that my Widget/Scaffold doesn't update here...

friends == true ? new RaisedButton(onPressed: unfollow()) :
                  new RaisedButton(onPressed: follow());

Any ideas? I'll update with exact code once later.

Upvotes: 0

Views: 1612

Answers (1)

marktechson
marktechson

Reputation: 409

the issue is that you've used an == (equality) comparison operator instead of = (assignment). Change your code to the following:

  Future<Null> _friends() async {
     fb.child("users/${userid}/Following/${id}").onValue.listen((Event event) {
      setState((){
        // this will return true or false which is what you want based on your code :)
        friends = event.snapshot.value == null; 
      });
  });
}

Upvotes: 1

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