Question

我有这个代码。

export const PostcodeFinder: React.FC = () => {
  const {
    postcodeSearch,
    isLoading,
    data,
    isPending,
    error: fetchError,
  } = usePostcodeSearch();


  return (
    <Formik
      validate={(values) => {
        // will be ran before the `fetchError` is set from async response
        if (fetchError) {
          return { postcode: fetchError };
        }

        return {};
      }}

问题是验证称为onChange或在提交表单时使它在异步响应返回之前运行。

如何通过Formik中的异步响应设置验证错误？

Answer 1

您需要返回一个承诺，该承诺将解决错误对象{ someKey: 'some message' }

<Formik
      validate={async (values) => {
        const resp = fetch(`/validateEmailExists?email=${values.email}`);
        const data = await resp.json();
        if (data.emailExists) {
          return { email: data.message /* it can be your own custom message */ };
        }

        return {};
      }}

如何将异步响应作为Formik中的验证错误进行处理

1 个答案: