I want to validate a not required form field with Yup
const validationSchema = Yup.object().shape({
firstname: Yup.string().required("First name is required").matches(/[A-Za-z]/,"Should contain only alphabets").min(3,'Should contain atleast ${min} alphabets`).max(20,`Should not exceed ${max} alphabets'),
lastname: Yup.string().nullable().notRequired()
})
lastname: Yup.string.nullable().notRequired(). I don't how to proceed further because I have multiple condition to validate the field if the input was given.
My validation condition are:
You should use similar match pattern you already have for firstname. One possible way of doing is like this:
const obj = {
firstname: 'my name',
lastname: 'asd'
};
const yupObj = yup.object().shape({
firstname: yup.string().required("First name is required").matches(/[A-Za-z]/,"Should contain only alphabets").min(3,'Should contain atleast 3 alphabets').max(20,`Should not exceed 20 alphabets`),
lastname: yup.string().nullable().notRequired().matches(/[a-zA-Z]{2,20}/, 'should have alphabets between 2 and 20')
})
yupObj
.validate(obj)
.then(function(value) {
console.log(value);
})
.catch(function(err) {
console.log(err);
});