alertDialog with textfield validator flutter
To create an alertDialog
with a text field validator in Flutter, you can use the showDialog
function along with a TextFormField
widget. Here's an example:
showDialog(
context: context,
builder: (BuildContext context) {
String inputText = '';
return AlertDialog(
title: Text('Enter Text'),
content: TextFormField(
onChanged: (value) {
inputText = value;
},
validator: (value) {
if (value.isEmpty) {
return 'Please enter some text';
}
return null;
},
),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: Text('Cancel'),
),
TextButton(
onPressed: () {
if (inputText.isNotEmpty) {
// Do something with the input text
}
Navigator.of(context).pop();
},
child: Text('OK'),
),
],
);
},
);
In this example, we use the showDialog
function to display the AlertDialog
on the screen. The builder
parameter is used to build the content of the dialog. Inside the builder
, we define a TextFormField
widget to capture the user's input text.
The onChanged
callback is invoked whenever the text field's value changes, allowing us to update the inputText
variable. The validator
callback is used to validate the input text. If the user submits an empty text, an error message is displayed.
The actions
parameter is used to define the buttons in the dialog. In this example, we have a "Cancel" button and an "OK" button. The "Cancel" button closes the dialog without performing any action, while the "OK" button checks if the input text is not empty before performing some operation.
Remember to replace context
with the appropriate context from your Flutter application.