How to work on Firebase database in Flutter Calendar for appointment?
In the Flutter Event Calendar, you can add the appointment data to FireBase database from selected value of PopupMenuItem and fetch these values to display as Flutter calendar events.
STEP 1: Add the required packages in Pubspec.yaml.
syncfusion_flutter_calendar: ^19.1.58 firebase_core: ^1.1.0 cloud_firestore: ^1.0.7 firebase_database: ^6.1.2
STEP 2: Create a database in Firebase and store the appointment data. Please refer the following Firebase documentation to create database and store the data.
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STEP 3: Add a method for fetching data from the database.
getDataFromDatabase() async {
var value= FirebaseDatabase.instance.reference();
var getValue=await value.child('CalendarAppointmentCollection').once();
return getValue;
}
STEP 4: Call this method in initState() and update appointment values.
void initState() {
getDataFromDatabase().then((results) {
setState(() {
if(results !=null) {
querySnapshot = results;
}
});
});
super.initState();
}
STEP 5: Fetch appointments from the database.
@override
Widget build(BuildContext context) {
return Scaffold(
body: _showCalendar(),
);
}
_showCalendar() {
if (querySnapshot != null) {
List<Meeting> collection;
var showData = querySnapshot.value;
Map<dynamic, dynamic> values = showData;
List<dynamic> key = values.keys.toList();
if (values != null) {
for (int i = 0; i < key.length; i++) {
data = values[key[i]];
collection ??= <Meeting>[];
final Random random = new Random();
collection.add(Meeting(
eventName: data['Subject'],
isAllDay: false,
from: DateFormat('dd/MM/yyyy HH:mm:ss').parse(data['StartTime']),
to: DateFormat('dd/MM/yyyy HH:mm:ss').parse(data['EndTime']),
background: _colorCollection[random.nextInt(9)],
resourceId: data['ResourceId']));
}
} else {
return Center(
child: CircularProgressIndicator(),
);
}
return SfCalendar(
view: CalendarView.timelineDay,
allowedViews: [
CalendarView.timelineDay,
CalendarView.timelineWeek,
CalendarView.timelineWorkWeek,
CalendarView.timelineMonth,
],
initialDisplayDate: DateTime(2020, 4, 5, 9, 0, 0),
dataSource: _getCalendarDataSource(collection),
monthViewSettings: MonthViewSettings(showAgenda: true),
);
}
void _initializeEventColor() {
this._colorCollection = new List<Color>();
_colorCollection.add(const Color(0xFF0F8644));
_colorCollection.add(const Color(0xFF8B1FA9));
_colorCollection.add(const Color(0xFFD20100));
_colorCollection.add(const Color(0xFFFC571D));
_colorCollection.add(const Color(0xFF36B37B));
_colorCollection.add(const Color(0xFF01A1EF));
_colorCollection.add(const Color(0xFF3D4FB5));
_colorCollection.add(const Color(0xFFE47C73));
_colorCollection.add(const Color(0xFF636363));
_colorCollection.add(const Color(0xFF0A8043));
}
STEP 6: Use the push() method to add appointment data to the database based on the selected value from the PopupMenuItem. The push() method creates a random ID in the database, and the set() method contains the data from the form. The then() callback executes after the data is added to the Firebase database. You can also use the remove() method to delete data from the Firebase database.
leading: PopupMenuButton<String>(
icon: Icon(Icons.settings),
itemBuilder: (BuildContext context) => options.map((String choice) {
return PopupMenuItem<String>(
value: choice,
child: Text(choice),
);
}).toList(),
onSelected: (String value) {
if (value == 'Add') {
final dbRef =
FirebaseDatabase.instance.reference().child("CalendarAppointmentCollection");
dbRef.push().set({
"StartTime": '07/04/2020 07:00:00',
"EndTime": '07/04/2020 08:00:00',
"Subject": 'NewMeeting',
"ResourceId": '0001'
}).then((_) {
Scaffold.of(context).showSnackBar(
SnackBar(content: Text('Successfully Added')));
}).catchError((onError) {
print(onError);
});
} else if (value == 'Delete') {
final dbRef =
FirebaseDatabase.instance.reference().child("CalendarAppointmentCollection");
dbRef.remove();
}
},
),
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I hope you enjoyed learning how to work with Firebase database in Flutter Calendar for appointment.
You can refer to our Flutter Calendar feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
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