Conditional validation with Yup and Formik

问题

Here is my validation schema:

const validationSchema = Yup.object().shape({
      person: Yup.object().shape({
        name: Yup.string().required('Field is required'),
        surname: Yup.string().required('Field is required'),
        middleName: Yup.string().required('Field is required'),
        email: Yup.string()
          .email('Wrong e-mail format')
          .required('Field is required')
      }),
      company: Yup.object().shape({
        name: Yup.string().required('Field is required'),
        address: Yup.string().required('Field is required'),
        email: Yup.string()
          .email('Wrong e-mail format')
          .required('Field is required')
      })
    });

And also there are two variables in React State: isPerson and isCompany. How to make validation work conditionally, for example if isPerson is true, then person in validationSchema is required to be validated?

回答1:

You can conditionally add to your validation schema just like any other object:

let validationShape = {
  company: Yup.object().shape({
    name: Yup.string().required('Field is required'),
    address: Yup.string().required('Field is required'),
    email: Yup.string()
      .email('Wrong e-mail format')
      .required('Field is required')
  })
};

if (this.state.isPerson) {
  validationShape.person = Yup.object().shape({
    name: Yup.string().required('Field is required'),
    surname: Yup.string().required('Field is required'),
    middleName: Yup.string().required('Field is required'),
    email: Yup.string()
      .email('Wrong e-mail format')
      .required('Field is required');
}

const validationSchema = Yup.object().shape(validationShape);

回答2:

you can use Yup conditions

const validationSchema = Yup.object().shape({

      isCompany: Yup.boolean(),
      companyName: Yup.object().when('isCompany', {
        is: true,
        then: Yup.string().required('Field is required'),
        otherwise: Yup.string()
      }),
      companyAddress: Yup.object().when('isCompany', {
        is: (companyValue) => true,//just an e.g. you can return a function
        then: Yup.string().required('Field is required'),
        otherwise: Yup.string()
      }),
    });

And make sure to update your form accordingly. I hope you get the point...

来源：https://stackoverflow.com/questions/54919228/conditional-validation-with-yup-and-formik

标签

javascript

formik

yup