How To Add OnChange In Custom Textfield

Question

I am trying to create a custom textfield so that i can easily change the design in one place only. The problem is, i don't know how to add onchange property in this custom textfield whenever it is provided. Can someone please show me how to do this. Fyi, this onchange property is optional. Below is my code.

Custom Textfield:

  class CustomTextFieldOutline extends StatelessWidget {
  CustomTextFieldOutline(
      {@required this.label,
      @required this.controller,
      @required this.isObscureText,
      @required this.isValid,
      @required this.invalidMsg});

  final String label;
  final TextEditingController controller;
  final bool isObscureText;
  final bool isValid;
  final String invalidMsg;

  @override
  Widget build(BuildContext context) {
    return TextField(
      decoration: InputDecoration(
          labelText: label,
          errorText: isValid ? null : invalidMsg,
          errorStyle: TextStyle(color: constant.colorWhite),
          labelStyle: TextStyle(color: constant.colorWhite),
          errorBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: constant.colorWhite),
          ),
          focusedErrorBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: constant.colorWhite),
          ),
          enabledBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: constant.colorWhite),
          ),
          focusedBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: constant.colorWhite),
          )),
      style: TextStyle(color: constant.colorWhite),
      controller: controller,
      obscureText: isObscureText,
    );
  }
}

Textfield:

          CustomTextFieldOutline(
              label: constant.email,
              controller: _emailSignUpController,
              isValid: _isEmailValid,
              invalidMsg: _emailValidMsg,
              isObscureText: false,
            )

eandpi · Accepted Answer · 2020-03-23 02:43:19Z

2

You can pass in a function as a parameter into your custom textfield. Declare a property called Function onPressed, so you're constructor will look like this:

 CustomTextFieldOutline(
      {@required this.label,
      @required this.controller,
      @required this.isObscureText,
      @required this.isValid,
      @required this.invalidMsg,
      @required this.onPressed
});

By doing this you can obtain custom onChanged functionality by defining a custom function for each custom textfield. Hope that helped!

edited Mar 23, 2020 at 2:43

answered Mar 23, 2020 at 2:29

eandpi

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