How to Remove validation text?

Question

This is My Custom validation textfield

CmnTextField(
 labelText: "Location",
 controller: LocationController,
 readOnly: true,
 autoValidateMode: controller.unit
 ? AutovalidateMode.always
 : AutovalidateMode.disabled,
 onTap: () async {
 final result = await Navigator.of(context).push(MaterialPageRoute(
 builder: (_) => SelectLocation(whichLocation: 'From Location')));
 if (result != null && result is Locations) {
 _assignFromLocation(result);
 }
 },
 validator: _validateInput,
 enabled: isEdit
 ? false
 : controller.isMove ||
 controller.isCustomMove ||
 controller.unit,
 ),

This is my validation Function:

String? _validateInput(String? value) {
 if (controller.unit) {
 if (value == null || value.isEmpty) {
 return 'required';
 }
 }
 return null;
 }

When controller.unit this is condition is true make disable textfield and remove validation and when this condition is false at time i need on autovalidation mode so how i can achieve this?

if anyone have any idea then tell me

• Ravindra S. Patil: apply some code if your controller.unit is null validator: controller.unit ? null : _validateInput,
• Tulsi virani: Then textfield autovalidation not working
• DroidFlutter: Have you tried GlobalKey<FormState> key with Form widget?
• DroidFlutter: Try to wrap CmnTextField with Form widget.
• Tulsi virani: yes it's already added still not working, you have any other solution?