onInit method

@override void onInit()

Called immediately after the widget is allocated in memory. You might use this to initialize something for the controller.

Implementation

@override
  void onInit() {
    super.onInit();
    taxId.text = '';
    taxPercentage.text = '';
    extraFee.text = '';
    taxId.addListener(() {
 update();
    });
    taxPercentage.addListener(() {
update();
    });
    extraFee.addListener(() {
 update();
    });
  }