获取 React 以在表单输入字段下显示单个错误消息

Question

我正在提交一个返回错误数组的表单，但我无法弄清楚如何让每个单独的错误出现在正确的输入字段下。现在所有错误都打印在每个输入字段下。我正在使用react-bootstrap。任何帮助将不胜感激。

getValidationState() {
  var errors = this.state.errors;
  if (!$.isEmptyObject(errors))
  {
    errors.forEach(function(error) {
      console.log("error:", error.name);
    });
  }
}

render() {
  const inputProps = {
    value: this.state.address,
    onChange: this.onChange,
  }
  return (
    <form onSubmit={this.handleSubmit.bind(this)}>
      <FormGroup
        validationState={this.getValidationState()} >
        <FormControl
          type="text"
          name="firstName"
          value={this.state.firstName}
          placeholder="First name"
          onChange={this.handleChange}
        />
        <FormControl.Feedback />
        {this.state.errors && this.state.errors.length &&
          <HelpBlock>
            {this.state.errors.map((error, i) => <p key={i}>HEllo{error.value}</p>)}
          </HelpBlock>
        }


      </FormGroup>
      <FormGroup >
        <FormControl
          type="text"
          name="lastName"
          value={this.state.lastName}
          placeholder="Last name"
          onChange={this.handleChange}
        />
        {this.state.errors && this.state.errors.length &&
          <HelpBlock>
            {this.state.errors.map((error, i) => <p key={i}>HEllo{error.value}</p>)}
          </HelpBlock>
        }
      </FormGroup>


      <FormGroup >
        <Button type="submit">
          Save
        </Button>
      </FormGroup>
    </form>
  )
}

Answer 1

每个输入的错误消息应该单独存储和显示（也可以使用状态）：

constructor(props){
  super(props)
  this.state = {
      firstNameErr: '',
      lastNameErr: '',
  }
  this.getValidationState = this.getValidationState.bind(this);
}

getValidationState() {
  var errors = this.state.errors;
  if (!$.isEmptyObject(errors))
  {
    var firstErr = '';
    var lastErr = '';
    errors.forEach((error) => {
      console.log("error:", error.name);
      // Check each error to see which input it belongs to
      // NOTE: please also consider using error.name instead, if error.message is invalid, thanks!
      if(error.message.indexOf('firstName') != -1){
        firstErr = error.message;
      }
      if(error.message.indexOf('lastName') != -1){
        lastErr = error.message
      }     

    });

    this.setState({
      firstNameErr: firstErr,
      lastNameErr: lastErr,
    });

  }
}

render() {
  const inputProps = {
    value: this.state.address,
    onChange: this.onChange,
  }
  return (
    <form onSubmit={this.handleSubmit.bind(this)}>

      <FormGroup
        validationState={this.getValidationState()} >
        <FormControl
          type="text"
          name="firstName"
          value={this.state.firstName}
          placeholder="First name"
          onChange={this.handleChange}
        />
        <FormControl.Feedback />
        <HelpBlock>
          <p className="text-danger">{this.state.firstNameErr}</p>
        </HelpBlock>
      </FormGroup>

      <FormGroup >
        <FormControl
          type="text"
          name="lastName"
          value={this.state.lastName}
          placeholder="Last name"
          onChange={this.handleChange}
        />
        <HelpBlock>
          <p className="text-danger">{this.state.lastNameErr}</p>
        </HelpBlock>
      </FormGroup>


      <FormGroup >
        <Button type="submit">
          Save
        </Button>
      </FormGroup>
    </form>
  )
}

就是这样，如果它还不起作用，请在此处显示控制台中的一些错误，谢谢