如何在Redux表单中使用formValueSelector获取更改时更新的输入字段值

Question

我正在使用redux-form和formValueSelector从字段中获取输入值。 我想从更改中获取价值，但是在函数onChange上调用@@redux-form/CHANGE操作。 所以我没有更新的价值。 我的代码：

export class PersonFilter extends React.Component {
  constructor(props) {
    super(props);
  }

  filterByName = (event, searchName) => {
    //here searchName is getting old value
    store.dispatch({type: 'PERSON_FILTER_BY_NAME', payload: {name: searchName}});
  };


  render() {
    const {
      searchName
    } = this.props;

    return (
      <form className="person person--filter" onSubmit={e => {
        e.preventDefault();
        this.filterByName(e, searchName)
      }}>
        <Field
          onChange={e => {
            this.filterByName(e, searchName)
          }}
          className="person__input" icon="search"
          name="searchName" component={renderField} type="text"
          placeholder="Name"/>

      </form>
    );
  }
}



PersonFilter = reduxForm({
  form: 'filter',
  initialValues: {
    searchName: store.getState().personsFilterReducer.filterByName
  }

})(PersonFilter);

const selector = formValueSelector('filter');

PersonFilter = connect(state => {
  const searchName = selector(state, 'searchName');
  return {
    searchName
  }
})(PersonFilter);

和包装器组件：

class Persons extends React.Component {
  constructor() {
    super();
  }

  render() {
    return (
      <div>
        <PersonFilter/>
      </div>  
    };    
  }
}  

Answer 1

而不是仅将onChange传递给操作，您应该setState ，首先在包装器组件构造函数中初始化状态this.state ，并确保将道具也传递给构造函数，然后在onChange函数this.setState设置一个状态并将其绑定。 像这样：

包装组件

class Persons extends React.Component {
    constructor (props) {
        super(props);
        this.state = {} 
    }
    onChange(field, value) {   
        this.setState({[field]: value});
    }
    render () {
        return <PersonFilter onChange={this.onChange.bind(this)} />
    }
}

然后在PersonFilter组件内部创建一个函数onFieldChange ，该函数onFieldChange引用传递给包装组件内部的onChange函数以设置状态this.setState

export class PersonFilter extends React.Component {
  constructor(props) {
    super(props);
  }

    onFieldChange(event) {
        const changeName = event.target.name;
        const changeValue = event.target.value;
        this.props.onChange(fieldName, fieldValue);
    }

然后最后

     <Field
      onChange={this.onFieldChange.bind(this)}
      className="person__input" icon="search"
      name="searchName" component={renderField} type="text"
      placeholder="Name"/>