onChange property
Called when the user initiates a change to the TextField's value: when they have inserted or deleted text.
This callback doesn't run when the TextField's text is changed programmatically, via the TextField's controller. Typically it isn't necessary to be notified of such changes, since they're initiated by the app itself.
To be notified of all changes to the TextField's text, cursor, and selection, one can add a listener to its controller with TextEditingController.addListener.
onChange is called before onSubmit when user indicates completion of editing, such as when pressing the "done" button on the keyboard. That default behavior can be overridden. See onEditingComplete for details.
See also:
- inputFormatters, which are called before onChange runs and can validate and change ("format") the input value.
- onEditingComplete, onSubmit: which are more specialized input change notifications.
Implementation
final ValueChanged<String>? onChange;