javascript - 是的，条件验证

Question

我有一个电子邮件字段，只有在选中复选框时才会显示（布尔值为true）。当表单被提交时，如果复选框被选中，我只需要这个字段（布尔值为真）。

这是我迄今为止尝试过的：

    const validationSchema = yup.object().shape({
       email: yup
             .string()
             .email()
             .label('Email')
             .when('showEmail', {
                 is: true,
                 then: yup.string().required('Must enter email address'),
             }),
        })

我尝试了其他几种变体，但我从 Formik 和 Yup 得到错误：

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

我也收到了来自 Yup 的验证错误。我究竟做错了什么？

score 114 · Accepted Answer

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")
      })
  })
}

score 53 · Accepted Answer

Formik作者在这里...

为了使Yup.when工作正常，您必须添加showEmail到initialValues您的 Yup 模式形状。

通常，使用时validationSchema，最佳实践是确保所有表单的字段都具有初始值，以便 Yup 可以立即看到它们。

结果将如下所示：

<Formik 
  initialValues={{ email: '', showEmail: false }}
  validationSchema={Yup.object().shape({
    showEmail: Yup.boolean(),
    email: Yup
      .string()
      .email()
      .when("showEmail", {
        is: true,
        then: Yup.string().required("Must enter email address")
      })
  })
}

/>

score 21 · Accepted Answer

完全同意@João Cunha 的回答。只是单选按钮用例的补充。

当我们使用单选按钮作为条件时，我们可以检查字符串的值而不是布尔值。例如is: 'Phone'

const ValidationSchema = Yup.object().shape({
  // This is the radio button.
  preferredContact: Yup.string()
    .required('Preferred contact is required.'),
  // This is the input field.
  contactPhone: Yup.string()
    .when('preferredContact', {
      is: 'Phone',
      then: Yup.string()
        .required('Phone number is required.'),
    }),
  // This is another input field.
  contactEmail: Yup.string()
    .when('preferredContact', {
      is: 'Email',
      then: Yup.string()
        .email('Please use a valid email address.')
        .required('Email address is required.'),
    }),

});

这是用 ReactJS 编写的单选按钮，onChange 方法是触发条件检查的关键。

<label>
  <input
    name="preferredContact" type="radio" value="Email"
    checked={this.state.preferredContact == 'Email'}
    onChange={() => this.handleRadioButtonChange('Email', setFieldValue)}
  />
  Email
</label>
<label>
  <input
    name="preferredContact" type="radio" value="Phone"
    checked={this.state.preferredContact == 'Phone'}
    onChange={() => this.handleRadioButtonChange('Phone', setFieldValue)}
  />
  Phone
</label>

这是单选按钮更改时的回调函数。如果我们使用 Formik，setFieldValue是要走的路。

handleRadioButtonChange(value, setFieldValue) {
  this.setState({'preferredContact': value});
  setFieldValue('preferredContact', value);
}

score 14 · Accepted Answer

您甚至可以将函数用于复杂情况。功能案例有助于复杂的验证

validationSchema={yup.object().shape({
    showEmail: yup.boolean(),
    email: yup
      .string()
      .email()
      .when("showEmail", (showEmail) => {
        if(showEmail)
          return yup.string().required("Must enter email address")
      })
  })
}

score 9 · Accepted Answer

email: Yup.string()
    .when(['showEmail', 'anotherField'], {
        is: (showEmail, anotherField) => {
            return (showEmail && anotherField);
        },
        then: Yup.string().required('Must enter email address')
    }),

score 1 · Accepted Answer

我将 yup 与 vee-validate 一起使用

vee验证

这是来自项目的示例代码

const schema = yup.object({
    first_name: yup.string().required().max(45).label('Name'),
    last_name: yup.string().required().max(45).label('Last name'),
    email: yup.string().email().required().max(255).label('Email'),
    self_user: yup.boolean(),
    company_id: yup.number()
        .when('self_user', {
            is: false,
            then: yup.number().required()
        })
})
const { validate, resetForm } = useForm({
    validationSchema: schema,
    initialValues: {
        self_user: true
    }
})

const {
    value: self_user
} = useField('self_user')
const handleSelfUserChange = () => {
    self_user.value = !self_user.value
}

score 1 · Accepted Answer

它非常适合我：

   Yup.object().shape({
    voyageStartDate:Yup.date(),
    voyageEndDate:Yup.date()
        .when(
            'voyageStartDate',
            (voyageStartDate, schema) => (moment(voyageStartDate).isValid() ? schema.min(voyageStartDate) : schema),
        ),
})

javascript - 是的，条件验证

7 回答 7

我将 yup 与 vee-validate 一起使用

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