I have TextFormField widget with username
TextFormField(
controller: usernameController,
validator: (value) {
if (value!.isEmpty) {
return 'username is empty';
}
if (value.length <= 4) {
return 'passord id too short, min 4 characters';
}
return null;
},
decoration: const InputDecoration(
hintText: 'username',
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.black))),
),
But I want to take username to database as one word. How to validate spacing TextFormField
CodePudding user response:
You can split the string on space and count the list length.
validator: (value) {
if (value!.isEmpty) {
return 'username is empty';
}
if (value.trim().split(" ").length > 1) { // trim for single word extra space, you can remove it if needed
return 'cant be multi word';
}
if (value.length <= 4) {
return 'passord id too short, min 4 characters';
}
return null;
},