Question

    ` import React, { Component, PropTypes } from 'react';
       import { connect } from 'react-redux';
        import { itemsFetchData } from '../actions/sidenavaction';

       class SideNavItem extends Component {
            componentDidMount() {
           this.props.fetchData('http:
           //58f5d2ccc9deb71200ceecef.mockapi.io/nav');
            }

          render() {    
          var Nest=function(par) {
                const numbers = par.itemized;
                const listItems = numbers.map((number) => <li key=
           {number.sid}>{number.svalue}</li>);
                return (<ul>{listItems}</ul>);
            };



             if (this.props.hasErrored) {
               return <p>Sorry! There was an error loading the items</p>;
               }

           if (this.props.isLoading) {
        return <p>Loading…</p>;
              }

           return (
        <ul>{this.props.items.map((item) =>         
        <ul key={item.id} onClick={this.props.toggleDiv}><a href="#">
           {item.value}</a>
            {item.sub && <Nest itemized={item.sub} />}          
        </ul>               
        )}
        </ul>
            );          
          }
             }

        const mapStateToProps = (state) => {
      return {
     items: state.items,
     hasErrored: state.itemsHasErrored,
     isLoading: state.itemsIsLoading
           };
            };

         const mapDispatchToProps = (dispatch) => {
               return {
             fetchData: (url) => dispatch(itemsFetchData(url)),
                toggleDiv: () => dispatch(toggleDiv())
            };
       };

              export default connect(mapStateToProps, mapDispatchToProps)
        (SideNavItem);`

在on click函数上我将toggleDiv动作传递给props但是在点击我的屏幕上的标签时它会抛出错误toggleDiv未定义。状态也会被我想要通过动作和减速器传递的值更新（动作）
export function toggleDiv(){ return { type: 'TOGGLE_DIV' }; }

（减速器） `export function toggleDivReducer（state = {hidden：true}，action）{ switch（action.type）{

        case 'TOGGLE_DIV':
        return Object.assign({}, state, {hidden: !state.hidden});

            default:
            return state;

          }

           }`

Answer 1

您只导入itemsFetchData操作，但不导入toggleDiv，因此当mapDispatchToProps时，toggleDiv未定义

我可以使用action和reducer来更新状态，但是当我尝试对它执行的操作执行onClick时，我可以在组件上更新状态

1 个答案: