如何在Redux表單中使用formValueSelector獲取更改時更新的輸入字段值

Question

我正在使用redux-form和formValueSelector從字段中獲取輸入值。 我想從更改中獲取價值，但是在函數onChange上調用@@redux-form/CHANGE操作。 所以我沒有更新的價值。 我的代碼：

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);

和包裝器組件：

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

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

Answer 1

而不是僅將onChange傳遞給操作，您應該setState ，首先在包裝器組件構造函數中初始化狀態this.state ，並確保將道具也傳遞給構造函數，然后在onChange函數this.setState設置一個狀態並將其綁定。 像這樣：

包裝組件

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組件內部創建一個函數onFieldChange ，該函數onFieldChange引用傳遞給包裝組件內部的onChange函數以設置狀態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"/>