How to set validation of max word in textformfield in flutter?

Question

inputFormatters: [
              LengthLimitingTextInputFormatter(50),
            ],

The above code in TextFormField restricted character length not words. I want to set validation that this field only allow to adds Max 50 words in flutter.

Answer 1

You can consider the following ways.

1. using a TextFormField with a validator.

TextFormField(
  validator: (text) {
    if (text.split(' ').length > max_limit) {
      return 'Reached max words';
    }
    return null;
  },
);

2. Add a decoration which will show an error if the limit is crossed.

TextField(
  controller: _text,
  decoration: InputDecoration(
    labelText: 'Enter 5 words',
    errorText: _validate ? 'You have entered more than 5 words' : null,
  ),
);

On your OnChanged() -> update the _validate variable based on your condition.