How do I validate a Field Array in Formik?

How do I validate a Field Array in Formik?

To validate a Field Array in Formik, you can use the validate function in your Formik setup. You can define a custom validation function that checks each item in the array.

Can you show me an example of that?

Sure! Here's a simple example:

const validate = values => {
  const errors = {};
  if (!values.items || values.items.length === 0) {
    errors.items = 'At least one item is required';
  } else {
    values.items.forEach((item, index) => {
      if (!item.name) {
        errors.items[index] = { name: 'Required' };
      }
    });
  }
  return errors;
};

This function checks if the items array is empty and validates each item.

What if I want to add dynamic fields to the array?

You can use Formik's FieldArray component to manage dynamic fields. You can add or remove fields using the push and remove methods provided by FieldArray.

Thanks! This is really helpful.