I want to make sure that users can put numbers only from 1 - 10 in TextFormField Flutter-CodePudding

This is the code for the textformfield I want to restrict. Users should only be able to enter values from 1-10 but I cant find how to implement that

       TextFormField(
                validator: (value) {
                  if (value.isEmpty) {
                    return 'Please enter the Overall Rating';
                  }
                  return null;
                },
                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  FilteringTextInputFormatter.digitsOnly
                ], // Only numbers can be entered
                maxLength: 2,
                maxLengthEnforced: true,
                controller: overall,
                decoration: InputDecoration(
                    hintText: "Overall Rating  Out of /10",
                ),
              ),

CodePudding user response：

you can update your validator function as follows


validator: (value) {
   if (value.isEmpty) {
     return 'Please enter the Overall Rating';
   }
   if(value < 1 || value > 10) {
      return 'The rating must be between 1 and 10';
   }

   return null;
},

CodePudding user response：

you can try with form and for digit validation, you need to parse the string to int

Form(
        key: _formKey,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextFormField(
              keyboardType: TextInputType.number,
              inputFormatters: <TextInputFormatter>[
                FilteringTextInputFormatter.digitsOnly
              ],
              // Only numbers can be entered
              maxLength: 2,
              maxLengthEnforced: true,
              controller: overall,
              decoration: InputDecoration(
                hintText: "Overall Rating  Out of /10",
              ),
              validator: (text) {
                if (text == null || text.isEmpty) {
                  return 'Text is empty';
                }
                if (int.parse(text) < 1 || int.parse(text) > 10) {
                  return 'The rating must be between 1 and 10';
                }
                return null;
              },
            ),
            TextButton(
              onPressed: () {
                if (_formKey.currentState.validate()) {
                  // TODO submit
                }
              },
              child: Text('Submit'),
            )
          ],
        ),
      )