异步验证 Redux 表单错误 未捕获的承诺

Question

我正在尝试使用redux-form构建注册表单。我正在尝试异步验证是否已收到电子邮件。

如果我输入一封电子邮件，输入

框将变为无效（如预期的那样），但是当我输入唯一的电子邮件并尝试提交时，我在控制台中遇到了以下错误："未捕获（承诺）{电子邮件："此电子邮件已被接收"}"

谢谢！

//asyncValidate.js
import axios from 'axios';
const asyncValidate = (values)=>
{
    return axios.post('/api/emails',{email:values.email})
    .then(res => {
      if (res) {
        throw { email: "This email has already been taken."};
      }
    })
}
export default asyncValidate;
//route.js
app.post('/api/emails', (req, res)=>{
    User.findOne({email: req.body.email},(err,user)=>{
    if (err) {console.log("error");}
    else  {res.json(user)};
});
});
//SignUpForm.js
import {Grid } from 'semantic-ui-react';
import AccountFields from './AccountFields';
import ContactFields from './ContactFields';
import HistoryFields from './HistoryFields';
import WaiverFields from './WaiverFields';
import * as actions from '../../actions';
import { withRouter } from 'react-router-dom';
 class SignUpForm extends Component {
    constructor(props){
    super(props)
    this.nextPage = this.nextPage.bind(this)
    this.previousPage = this.previousPage.bind(this)
    this.state ={
        page:1
    }
}
nextPage(){
this.setState({ page:this.state.page + 1})
}
previousPage(){
this.setState({ page: this.state.page - 1 })
}

render(){
    const { onSubmit,submitForm, history } = this.props
    const { page } = this.state
    return(
        <div>
      <Grid textAlign='center' style={{ height: '1000px' }} verticalAlign='middle'>

            <Grid.Column style={{ maxWidth: 700 }} textAlign='left'>
                {page === 1 && <AccountFields onSubmit={this.nextPage}/>}
                        {page === 2 && (
                          <ContactFields
                            previousPage={this.previousPage}
                            onSubmit={this.nextPage}
                          />
                        )}
                        {page === 3 && (
                          <HistoryFields
                            previousPage={this.previousPage}
                            onSubmit={this.nextPage}
                          />
                        )}
                        {page === 4 && (
                            <WaiverFields
                                previousPage={this.previousPage}
                                onSubmit={(v)=>submitForm(v,history)}
                                />
                        )}
</Grid.Column>
</Grid>
</div>
export default connect(null,actions)(withRouter(SignUpForm));

//AccountFields.js
class AccountFields extends Component {
render(){
    const { handleSubmit} = this.props
    return(

<Form size='large' onSubmit={handleSubmit}>

  <Segment stacked>



      <Header as='h1' color='black' textAlign='left'>
          <Image src={icon1} />
      <Header.Content>
       Create your Account
       <Header.Subheader>     to make an online appointment</Header.Subheader>
      </Header.Content>
      </Header>

<Field
    name='email'
    label='E-mail'
    component={renderField}
    as={Form.Input}
    type='email'
    icon='user'
    iconPosition='left'
    placeholder='E-mail Address'
    />

      <Form.Group widths='2'>
          <Field
              name='password'
              label='Password'
              component={renderField}
              as={Form.Input}
              type='password'
              icon='lock'iconPosition='left'
              placeholder='Password'/>
              <Field
                  name='password1'
                  label='Confirm Password'
                  icon="lock" iconPosition='left'
                  component={renderField}
                  as={Form.Input}
                  type='password'
                  placeholder='Confirm Password'
                  />

      </Form.Group>
      <Button type='submit'style={{marginTop:'5px'}} color='black' floated='right'  compact size='large'>
            Next
          </Button>
          <Link to='/login' >
<Button style={{marginTop:'5px'}}color='black' basic floated='left'>Log In Instead </Button>
</Link>

    <br></br>
    <br></br>
  </Segment>
</Form>)}}

export default reduxForm({
  form: 'wizard', // <------ same form name
  destroyOnUnmount: false, // <------ preserve form data
  forceUnregisterOnUnmount: true, // <------ unregister fields on unmount
  validate,
  asyncValidate,
  asyncBlurFields: ['email']
})(AccountFields)

Answer 1

即使您的数据库调用找不到用户，您没有指定响应，POST 请求仍将收到来自路由的响应，尽管它可能是一条错误消息，指出没有响应。无论哪种情况，您的.then块都将收到响应，从而引发错误。

相反，您应该做的是让您的 POST 处理程序返回"一切正常"响应（如果未找到用户）或错误消息（如果用户已存在）。如果你使用400块HTTP响应代码（如果用户存在），如果他们不存在，则使用200块，那么错误将进入axios请求的.catch块，你可以在那里处理它，而成功将进入.then，你可以在那里做你想做的事。