是的，React 中的 Formik 验证

Question

我有一个条件，如果值为“1”、“2”、“3”、“4”，则某个字段是必需的。你怎么能这样做？请检查下面的代码

 travelDate: yup.string().when('planeAvailable', {
    is: '1' || '2' || '3' || '4',
    then: yup.string().required('Choose Date'),
  }),

Answer 1

应该是

 travelDate: yup.string().when('planeAvailable', {
    is: val => ['1', '2', '3', '4'].includes(val)
    then: yup.string().required('Choose Date'),
  }),

doc

is conditions are strictly compared (===) if you want to use a different form of equality you can provide a function like: is: (value) => value == true.

是的，React 中的 Formik 验证

Yup and Formik Validation in React

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yup

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