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how to do validation on checkbox flutter

Yousef Njadat answered on June 13, 2024 Popularity 1/10 Helpfulness 1/10

answer how to do validation on checkbox flutter

how to do validation on checkbox flutter

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FormField(
  autovalidateMode: AutovalidateMode.always,
  initialValue: false,
  validator: (value) {
    if (value != true) {
      return "You need to accept terms!";
    }
    return null;
  },
  builder: (FormFieldState<bool> state) {
    return SizedBox(
      width: 300,
      child: CheckboxListTile(
          title: const Text("Agree Terms of Service"),
          subtitle: state.hasError
              ? Text(
                  state.errorText!,
                  style: const TextStyle(color: Colors.red),
                )
              : null
          value: state.value,
          onChanged: (val) {
            state.didChange(val);
          }),
    );
  }
)

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Source: www.flutter-gallery.com

Tags: checkbox flutter validation whatever

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