Question

我正在使用Formik / Yup来验证页面，该页面称为GraphQL突变。我的代码可以正常工作：

export default function RemoveUserPage() {
  const [isSubmitted, setIsSubmitted] = useState(false);
  const [isRemoved ,setIsRemoved] = useState(false);
  const [errorMessage, setErrorMessage] = useState('');

  const [removeUser] = useMutation(RemoveUserMutation);

  function submitForm(email: string) {
    setIsSubmitted(true);
    removeUser({
        variables: {
            email: email,
        },
    }).then(({ data }: any) => {
      setIsRemoved(true);
      console.log('info: ', data.deleteUser);
    })
    .catch((error: { message: string; }) => {
      setIsRemoved(false);
      console.log("Error msg:" + error.message);
      setErrorMessage(error.message)
    })
  }

  return (
    <div>
      <PermanentDrawerLeft></PermanentDrawerLeft>
      <Formik
        initialValues={{ email: '' }}
        onSubmit={(values, actions) => {
          setTimeout(() => {
            alert(JSON.stringify(values, null, 2));
            actions.setSubmitting(false);
          }, 1000);
        }}
        validationSchema={schema}
      >
        {props => {
          const {
            values: { email },
            errors,
            touched,
            handleChange,
            isValid,
            setFieldTouched
          } = props;
          const change = (name: string, e: any) => {
            e.persist();
            handleChange(e);
            setFieldTouched(name, true, false);           
          };
          return (
            <div className='main-content'>
              <form style={{ width: '100%' }}
               onSubmit={e => {e.preventDefault();submitForm(email)
                }}>
                <div>
                  <TextField
                    variant="outlined"
                    margin="normal"
                    id="email"
                    name="email"
                    helperText={touched.email ? errors.email : ""}
                    error={touched.email && Boolean(errors.email)}
                    label="Email"
                    value={email}
                    onChange={change.bind(null, "email")}
                  />
                  <br></br>
                  <Button
                  type="submit"
                  disabled={!isValid || !email}
                  >
                    Remove User</Button>
                </div>
              </form>
              <br></br>
              {isSubmitted && StatusMessage(isRemoved, errorMessage)}
            </div>
          )
        }}
      </Formik>
    </div>
  );
}

但是，现在我想使用useFormik钩子而不是<Formik>，但是我不能这样做。我已经看到了以下示例，但由于我使用的是材料ui组件而不是特定于甲酸的输入，因此我无法弄清楚在我的情况下如何在语法上精确地使用它。

https://jaredpalmer.com/formik/docs/api/useFormik

编辑：

这将进行编译，但在文本字段上没有进行任何验证。我想念什么？

export const schema = Yup.object({
  email: Yup.string()
    .email('Invalid Email')
    .required('This Field is Required'),
});


export default function RemoveUserPage() {
  const [isSubmitted, setIsSubmitted] = useState(false);
  const [isRemoved, setIsRemoved] = useState(false);
  const [errorMessage, setErrorMessage] = useState('');

  const [removeUser] = useMutation<DeleteUserResponse>(REMOVE_USER);

  let submitForm = (email: string) => {
    setIsSubmitted(true);
    removeUser({
      variables: {
        email: email,
      },
    })
      .then(({ data }: ExecutionResult<DeleteUserResponse>) => {
        if (data !== null && data !== undefined) {
          setIsRemoved(true);
          console.log('info: ', data.deleteUser);
        }
      })
      .catch((error: { message: string }) => {
        setIsRemoved(false);
        console.log('Error msg:' + error.message);
        setErrorMessage(error.message);
      });
  };

  const formik = useFormik({
    initialValues:{ email: '' },
    onSubmit:(values, actions) => {
       setTimeout(() => {
          alert(JSON.stringify(values, null, 2));
          actions.setSubmitting(false);
          }, 1000);
        },
       validationSchema:{schema}
    })

    const handleChange = (e: ChangeEvent<HTMLInputElement>)=>{
      const {name,value} = e.target;
      formik.setFieldValue(name,value);
     }

  return (
    <div>
      <PermanentDrawerLeft></PermanentDrawerLeft>
            <Wrapper>
              <Form
                onSubmit={e => {
                  e.preventDefault();
                  submitForm(formik.values.email);
                }}>
                <div>
                  <TextField
                    variant="outlined"
                    margin="normal"
                    id="email"
                    name="email"
                    helperText={formik.touched.email ? formik.errors.email : ''}
                    error={formik.touched.email && Boolean(formik.errors.email)}
                    label="Email"
                    value={formik.values.email}
                    //onChange={change.bind(null, 'email')}
                    onChange={handleChange}
                  />
                  <br></br>
                  <CustomButton
                    disabled={!formik.values.email}
                    text={'Remove User'}
                  />
                </div>
              </Form>
              <br></br>
              {isSubmitted && StatusMessage(isRemoved, errorMessage)}
              </Wrapper>
    </div>
  );
}

它给了我这个错误：

TypeError: schema[sync ? 'validateSync' : 'validate'] is not a function. (In 'schema[sync ? 'validateSync' : 'validate'](validateData, {
    abortEarly: false,
    context: context
  })', 'schema[sync ? 'validateSync' : 'validate']' is undefined)

第二，早些时候，我在按钮上使用了isValid，但现在出现了错误。有其他选择吗？

Answer 1

更新时间：2020年8月20日

在大多数情况下，您不会直接使用useFormik钩子，这不是为一般用例设计的。

我认为在文档中再次强调了这一点，该文档不适合一般用例。请使用Computation failed in `stat_function()`: object '.meanNDVI' not found而不是挂钩。作者的评论：Jared Palmer本人。

我在这里标记了一些问题：

https://github.com/formium/formik/issues/1722#issue-475725015 https://github.com/formium/formik/pull/1717#issuecomment-516867884

以前

就像乔·霍金斯（Jow Hawkins）提到的那样，了解钩子将是非常困难的，但是我将为您提供一些更改和答案，以帮助您开始使用钩子。

<Formik>

编辑：由于您正在使用Material Ui文本字段添加export default function RemoveUserPage() { const [isSubmitted, setIsSubmitted] = useState(false); const [isRemoved ,setIsRemoved] = useState(false); const [errorMessage, setErrorMessage] = useState(''); const [removeUser] = useMutation(RemoveUserMutation); function submitForm(email: string) { setIsSubmitted(true); removeUser({ variables: { email: email, }, }).then(({ data }: any) => { setIsRemoved(true); console.log('info: ', data.deleteUser); }) .catch((error: { message: string; }) => { setIsRemoved(false); console.log("Error msg:" + error.message); setErrorMessage(error.message) }) } const formik = useFormik({ initialValues:{ email: '' }, onSubmit:(values, actions) => { setTimeout(() => { alert(JSON.stringify(values, null, 2)); actions.setSubmitting(false); }, 1000); }, validationSchema:schema }) // depend on the return value const handleSubmit = (someReturnValue or event)=>{ // if the return event has name // such as event.target.name then you got the name // and try event.target.value // then set field value // eg: const value = event.current.value formik.setFieldValue(name, value) } // dont forget to set onBlur as well // this i will leave it to you return ( <div> <PermanentDrawerLeft></PermanentDrawerLeft> <div className='main-content'> <form style={{ width: '100%' }} onSubmit={formik.handleSubmit}> <div> <TextField variant="outlined" margin="normal" id="email" name="email" helperText={formik.touched.email ? formik.errors.email : ""} error={formik.touched.email && Boolean(formik.errors.email)} label="Email" value={formik.values.email} onChange={handleChange} /> <br></br> <Button type="submit" disabled={!isValid || !email} > Remove User</Button> </div> </form> <br></br> {isSubmitted && StatusMessage(isRemoved, errorMessage)} </div> </div> ); }方法

handleChange

然后在您的电子邮件组件中 const handleChange = (event)=>{ // get name and value from event.target // is the same as const name = event.target.name const {name,value} = event.target // make sure you have name prop in // your textfield and it is same name as your initial state formik.setFieldValue(name,value) // this call formik to set your value }

将<Formik>更改为useFormik

1 个答案:

在大多数情况下，您不会直接使用useFormik钩子，这不是为一般用例设计的。

以前