Trying to get TextFormField data from another widget - flutter

Question

I am building an app that generates form fields from JSON data.
the Form widget is declared in the custom_form.dart
child: Form(
key: _globalKey,
child: Column(
children: [
SizedBox(
height: 10,
),
Text("Register Form: "),
SizedBox(
height: 3,
),
for (var i = 0; i < this.widget.widgetList.length; i++)
generateWidgetFromType(this.widget.widgetList[i]),
I'm using that generateWidgetFrom Type to generate the widgets
Widget generateWidgetFromType(Mywidget mywidget) {
switch (mywidget.type) {
case "CheckBox":
return GenerateCheckBox(mywidget);
case "Input":
return CustomGeneratedWidget(mywidget,
onSaved: (value) => widget.test = value);
case "DatePicker":
return GenerateDatePicker(mywidget);
}
return Text("This type is not supported yet");
}
The TextFormField is declared in the CustomGeneratedWidget
child: TextFormField(
controller: textEditingController,
obscureText: isPasswordField(this.widget.mywidget.key),
keyboardType: customType(this.widget.mywidget.key),
decoration: InputDecoration(
labelText: this.widget.mywidget.label,
border: OutlineInputBorder()),
validator: (value) {
I want to retrieve data from TextFormField in the CustomGeneratedWidget when I click on the Add button in the custom_form.dart

Answer 1

One way might be to add a method called getValue() on to your CustomGeneratedWidget class:
class CustomGeneratedWidget extends Mywidget {
TextEditingController textEditingController = TextEditingController();
...
String getValue() {
return textEditingController.text;
}
...
#override
Widget build(BuildContext context) {
...
}
}
I'm guessing, based on what you're building, that you'll want to eventually get data not just from TextFormField / CustomGeneratedWidget instances, but also instances of GenerateCheckBox and GenerateDatePicker as well. With that being the case, if it were me, I would add an abstract method to Mywidget that you override in its subclasses, perhaps called getValue(). So, Mywidget might look like:
abstract class Mywidget extends Widget {
...
// this method is purposefully unimplemented, and is therefore an "abstract" method
dynamic getValue();
...
}
In your subclasses, such as CustomGeneratedWidget, you would "override" this method by redefining it / implementing it, and therefore making it "concrete":
class CustomGeneratedWidget extends Mywidget {
TextEditingController textEditingController = TextEditingController();
...
#override
String getValue() {
return textEditingController.text;
}
#override
Widget build(BuildContext context) {
return Container(
child: TextFormField(
controller: textEditingController
...
)
);
}
}
Back in custom_form.dart, in your handler for your 'Add' button, you could go through the list of created Mywidget instances and call getValue() on each.