是的，非必填字段的验证 [英] Yup validation for a non-required field

问题描述

我的项目中有一个配置文件创建表单，我使用 react-hooks-form 和 yup 库进行验证.

I have a profile creation form in my project for which i am using react-hooks-form and yup library for validation.

在表单中有一个名为 Github-Username 的字段，这是可选的.但是我想验证它是否用户输入了用户名并且它应该超过 2 个字符，类似这样.

In the form there is one field named Github-Username which is optional. But i want to validate it if users enters the username and it should be more than 2 characters, something like that.

  const schema = yup.object().shape({
    company: yup.string().min(3).required(),
    website: yup.string(),
    location: yup.string().min(2).required(),
    skills: yup.string().min(3).required(),
    githubUsername: yup.string().min(3).nullable().notRequired(),
    bio: yup.string(),
  });

  const { register, handleSubmit, errors, touched } = useForm({
    resolver: yupResolver(schema),
  });

//表单域

        <Form.Group controlId="formBasicGusername">
          <Form.Label>Github Username</Form.Label>
          <Form.Control
            type="text"
            name="githubUsername"
            ref={register}
          />
          <span className="text-danger text-capitalize">
            {errors.githubUsername?.message}
          </span>
        </Form.Group>

这是我目前编写的架构，不适用于 githubUsername.如果它是空的，它会显示错误.我只想在它不为空时进行验证.有这方面的线索吗?

This is the schema i have written so far, which is not working for githubUsername. It showing the error if it's empty. I want to validate only if it's not empty. Any leads on this?

推荐答案

批准的答案是正确的，但缺少一些信息.您需要向形状模式添加循环依赖

The approved answer is right but missing a bit of information. you need to add cyclic dependencies to the shape schema

const schema = yup.object().shape(
    {
        company: yup.string().min(3).required(),
        website: yup.string(),
        location: yup.string().min(2).required(),
        skills: yup.string().min(3).required(),
        githubUsername: yup
            .string()
            .nullable()
            .notRequired()
            .when('githubUsername', {
                is: (value) => value?.length,
                then: (rule) => rule.min(3),
            }),
        bio: yup.string(),
    },
    [
        // Add Cyclic deps here because when require itself
        ['githubUsername', 'githubUsername'],
    ]
);

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