I have an email field that only gets shown if a checkbox is selected (boolean value is true
). When the form get submitted, I only what this field to be required if the checkbox is checked (boolean is true).
This is what I've tried so far:
const validationSchema = yup.object().shape({
email: yup
.string()
.email()
.label('Email')
.when('showEmail', {
is: true,
then: yup.string().required('Must enter email address'),
}),
})
I've tried several other variations, but I get errors from Formik and Yup:
Uncaught (in promise) TypeError: Cannot read property 'length' of undefined
at yupToFormErrors (formik.es6.js:6198)
at formik.es6.js:5933
at <anonymous>
yupToFormErrors @ formik.es6.js:6198
And I get validation errors from Yup as well. What am I doing wrong?
You probably aren't defining a validation rule for the showEmail field.
I've done a CodeSandox to test it out and as soon as I added:
showEmail: yup.boolean()
The form started validation correctly and no error was thrown.
This is the url: https://codesandbox.io/s/74z4px0k8q
And for future this was the correct validation schema:
validationSchema={yup.object().shape({
showEmail: yup.boolean(),
email: yup
.string()
.email()
.when("showEmail", {
is: true,
then: yup.string().required("Must enter email address")
})
})
}