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- Question: how to change value dynamically on flutter dialog without pressing button or any thing
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how to change value dynamically on flutter dialog without pressing button or any thing
To change the value dynamically on a Flutter dialog without pressing any button or anything, you can make use of a StatefulBuilder widget. The StatefulBuilder widget is a special type of widget that allows you to rebuild a portion of the widget tree when its state changes.
Here’s an example of how you can use a StatefulBuilder widget to change the value dynamically on a Flutter dialog:
showDialog(
context: context,
builder: (BuildContext context) {
int _value = 0;
return StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return AlertDialog(
title: Text('Dynamic Value Example'),
content: Text('Value: $_value'),
actions: <Widget>[
FlatButton(
child: Text('Increment'),
onPressed: () {
setState(() {
_value++;
});
},
),
FlatButton(
child: Text('Decrement'),
onPressed: () {
setState(() {
_value--;
});
},
),
FlatButton(
child: Text('Close'),
onPressed: () {
Navigator.of(context).pop();
},
),
],
);
},
);
},
);
In this example, we create a StatefulBuilder widget that contains an AlertDialog. The value that we want to change dynamically is stored in the _value variable. We then use the StateSetter object that is passed to the builder function of the StatefulBuilder widget to update the value when the user presses the Increment or Decrement buttons.
By wrapping the AlertDialog widget with a StatefulBuilder widget, we can update the content of the dialog dynamically without having to close and reopen the dialog.
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How to get value from dialog Flutter?
To get a value from a dialog in Flutter, you can create a new dialog that contains a form with input fields for the user to enter data. Then, you can use the Navigator class to display the dialog and receive the result.
Here’s an example of how to create a simple dialog with an input field:
import ‘package:flutter/material.dart’;
class MyDialog extends StatefulWidget {
@override
_MyDialogState createState() => _MyDialogState();
}
class _MyDialogState extends State<MyDialog> {
final _formKey = GlobalKey<FormState>();
String _textFieldValue = ”;
@override
Widget build(BuildContext context) {
return AlertDialog(
title: Text(‘Enter a value’),
content: Form(
key: _formKey,
child: TextFormField(
decoration: InputDecoration(hintText: ‘Value’),
onChanged: (value) {
setState(() {
_textFieldValue = value;
});
},
validator: (value) {
if (value.isEmpty) {
return ‘Please enter a value’;
}
return null;
},
),
),
actions: <Widget>[
FlatButton(
child: Text(‘Cancel’),
onPressed: () {
Navigator.of(context).pop();
},
),
FlatButton(
child: Text(‘OK’),
onPressed: () {
if (_formKey.currentState.validate()) {
Navigator.of(context).pop(_textFieldValue);
}
},
),
],
);
}
}
This dialog has a text field where the user can enter a value. When the user taps the “OK” button, the dialog is closed and the entered value is returned to the calling widget.
Here’s an example of how to display the dialog and get the result:
Future<void> _showMyDialog() async {
String result = await showDialog(
context: context,
builder: (BuildContext context) {
return MyDialog();
},
);
if (result != null) {
print(‘The entered value is: $result’);
}
}
In this example, we call the _showMyDialog() function to display the dialog. The showDialog() function takes a BuildContext object and a builder function that returns the dialog widget.
When the user taps the “OK” button, the showDialog() function returns the entered value as a Future object. We use the await keyword to wait for the result, and then we check if the result is not null before printing it to the console.
What is barrierDismissible?
barrierDismissible is a parameter in Flutter’s showDialog function that determines whether a dialog can be dismissed by tapping outside of it.
When barrierDismissible is set to true, tapping outside of the dialog causes it to be dismissed, and any actions associated with the dialog are not executed.
When barrierDismissible is set to false, tapping outside of the dialog does nothing, and the user must explicitly dismiss the dialog by interacting with the content of the dialog itself (for example, by tapping a “close” button within the dialog).
The barrierDismissible parameter can be useful for dialogs that contain critical or important information, where the user should not accidentally dismiss the dialog without taking action first. On the other hand, for less important dialogs, it can be more convenient for users to be able to dismiss them quickly by tapping outside the dialog.
What is the difference between simple dialog and AlertDialog in Flutter?
In Flutter, a SimpleDialog is a widget that displays a dialog box with a list of options that a user can choose from. It is typically used to present a set of options to the user, such as a list of settings or actions that can be performed.
An AlertDialog, on the other hand, is a widget that displays a dialog box with a title, message, and a set of buttons that the user can interact with. It is typically used to present information or a decision that the user needs to make, such as a confirmation message or an error message.
In summary, while both SimpleDialog and AlertDialog are used to display dialog boxes, SimpleDialog is better suited for presenting a list of options, while AlertDialog is better suited for presenting a message or decision that the user needs to make.
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You can see some more information related to how to change value dynamically on flutter dialog without pressing button or any thing here
- Change AlertDialog title dynamically (showDialog())
- AlertDialog class – material library – Flutter – Dart API docs
- Hint 5: How to refresh the content of a Dialog via setState?
- Notification runtime permission – Android Developers
- Flutter – Creating Dialog in using GetX Library – GeeksforGeeks
- Flutter Alert/Simple Dialog examples – Technical Feeder
- How to get a value from a dialog in flutter? – Stack Overflow
- barrierDismissible property – ModalRoute class – widgets library
- Flutter Widgets 17 | SimpleDialog&AlertDialog – Medium
- First steps with Flutter – Part 3: Responding to user input
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