尽管 Semantic-React-UI 形式存在错误状态,但成功消息仍继续触发

Success message continues fire despite error state in Semantic-React-UI form

我正在尝试根据表单组件的状态触发适当的消息,以便在表单提交时进行前端验证。

我正在处理的主要验证之一是检查电子邮件是否存在,如果存在,应该继续看到错误消息触发。如果数据库中不存在,则应触发成功消息;当然,如果其他验证通过!

我正在使用 Semantic-UI React Forms 来帮助验证。

这些是我在表单组件的状态对象上设置的键和值:

this.state = {
  fadeUp: 'fade up',
  duration: 500,
  username: '',
  password: '',
  usernameError: false,
  passwordError: false,
  formSuccess: false,
  formError: false,
  userNameDup: false,
}

这是我的提交处理程序,在提交时触发:

handleSubmit(event) {
 event.preventDefault();
 var error = false

 var { username, password, userNameDup } = this.state

 var mailFormat = /^(([^<>()\[\]\.,;:\s@"]+(\.[^<>()\[\]\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/


if (!username.match(mailFormat)) {
  this.setState({ usernameError: true });
  error = true;
} else {
  this.setState({ usernameError: false });
}

if (password.length < 8) {
  this.setState({ passwordError: true });
  error = true;
} else {
  this.setState({ passwordError: false })
}

if (error) {
  this.setState({ formSuccess: false });
  return;
} else {
  this.setState({ formSuccess: true });
}

window.fetch('http://localhost:8016/users/registration', {
  method: 'POST',
  headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' },
  body: JSON.stringify({ username_email: username, password: password })
})
  .then(this.handleErrors)
  .then(function (response) {
    console.log(`response ${response}`)
    return response.json()
  }).then(function (data) {

    console.log('User created:', data)
  }).catch(function (error) {
    console.log(error);
  });

   setTimeout(() => { this.setState({ username: '', password: '' }) })

 }

handleErrors(response) {
  if (!response.ok) {
    if (response.status === 409) {
      console.log("response.status ", response.status);
      this.setState({
      userNameDup: true, formError: true, formSuccess:false
    });
    return;
  }
 } else {
  this.setState({
    userNameDup: false, formError:false
  })
 }
   return response;
 }

这是表格的一部分 view/markup:

  {console.log("formSuccess 1", formSuccess)}

<Form size='large'
  onSubmit={this.handleSubmit}
  error={userNameDup || formError}>
  {console.log("formSuccess 2", formSuccess)}

  <Segment stacked>
    <Form.Input fluid icon='user'
      iconPosition='left'
      placeholder='E-mail address, e.g. joe@schmoe.com'
      name='username'
      value={username}
      onBlur={this.handleBlur}
      onChange={this.handleChange}
      error={usernameError}
    />

    <Transition visible={usernameError}
      animation='scale'
      duration={duration}>
      <Message error content='username_Email is in incorrect format e.g. joe@schmoe.com' />
    </Transition>

    <Form.Input fluid icon='lock'
      iconPosition='left'
      placeholder='Password'
      name='password'
      value={password}
      onBlur={this.handleBlur}
      onChange={this.handleChange}
      error={passwordError}
    />

    <Transition visible={passwordError}
      animation='scale'
      duration={duration}>
      <Message error content='Password needs to be greater than eight characters.' />
    </Transition>

    <Button color='teal'
      fluid size='large'
      disabled={!username || !password}>
      Register
      {/* {isLoggedIn ? `Register` : `Log-in`} */}
    </Button>

    <Transition visible={userNameDup || formError}
      unmountOnHide={true}
      animation='scale'
      duration={duration}>
      <Message
        error
        centered="true" header='This email exists.'
        content='Please re-enter another email address.' />
    </Transition>

    <Transition visible={formSuccess}
      unmountOnHide={true}
      animation='scale'
      duration={duration}>
      <Message
        success
        header='Your user registration was successful.'
        content='You may now log-in with the username you have chosen.' />
    </Transition>
  </Segment>
</Form>

我提供了一个 ,您可以看到 formSuccess 键跳到 true 一秒钟,这导致了问题。但我认为我的 handleError 会在提交时处理这个问题?

再次处理错误:

 handleErrors(response) {
    if (!response.ok) {
      if (response.status === 409) {
        console.log("response.status ", response.status);
        this.setState({
          userNameDup: true, formError: true, formSuccess:false /* why doesn't it stay falsey? */
        });
        return;
      }
    } else {
      this.setState({
        userNameDup: false, formError:false
      })
    }
    return response;
  }

句柄提交摘录:

window.fetch('http://localhost:8016/users/registration', {
  method: 'POST',
  headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' },
  body: JSON.stringify({ username_email: username, password: password })
})
  .then(this.handleErrors) /* Shouldn't this be where it changes to false? */
  .then(function (response) {
    console.log(`response ${response}`)
    return response.json()
  }).then(function (data) {

    console.log('User created:', data)
  }).catch(function (error) {
    console.log(error);
  });

此外,消息不应该在每次点击注册时都显示动画吗?

求助!!!谢谢!

if (error) {
    this.setState({ formSuccess: false });
    return;
} else {
    this.setState({ formSuccess: true });
}

当您点击提交时,error 变量的初始值为 false,因此它将 formSuccess 状态更改为 true 直到承诺被解决 - 当 handleErrors 被调用时并将其改回 false。您应该只在从数据库中获取数据后将 formSuccess 设置为 true,即在 .then() 块内以避免异步问题。

解决它的一种方法是在您获取数据并验证用户是新用户后显示成功消息,如下所示:

handleErrors(response) {
  if (!response.ok) {
    if (response.status === 409) {
      console.log("response.status ", response.status);
      this.setState({
      userNameDup: true, formError: true, formSuccess:false
    });
    return;
  }
 } else {
  this.setState({
    userNameDup: false, formError:false, formSuccess: true
  })
 }
   return response;
 }

然后您的前端验证仅限于显示错误消息。

if (!username.match(mailFormat)) {
  this.setState({ usernameError: true, formSuccess: false } });
} else {
  this.setState({ usernameError: false });
}

if (password.length < 8) {
  this.setState({ passwordError: true, formSuccess: false } });
} else {
  this.setState({ passwordError: false })
}