即使未分派动作，Redux状态也会在加载时发生变化

Question

由于某些原因，当我加载Web应用程序时，即使没有分派动作，状态“ currentView”也将设置为“主题”，而不是初始值“ schools”。 为什么会这样呢？

actions.js

export function showSubjects(schoolId) {
  return {
    type: 'SHOW_SUBJECTS',
    schoolId
  };
}

Browse.js

const initialState = {
    currentView: 'schools',
    schools: [{id: 'AAAA', name: 'aaaa'}, {id: 'BBBB', name: 'bbbb'}],
    subjects: [{id: 'CCC', name: 'ccc'}, {id: 'DDD', name: 'ddd'}]
};

function browse(state = initialState, action) {
  switch (action.type) {
    case 'SHOW_SUBJECTS':
      return {
        ...state,
        currentView: 'subjects'
      };
    default:
      return state;
  }
}

export default browse;

BrowseReduxContainer.jsx

import { connect } from 'react-redux';
import { showSubjects } from '../actions/actions';
import Browse from '../components/Browse.jsx';

function propsFilter(state) {
  switch (state.currentView) {
    case 'schools':
      return state.schools;
    case 'subjects':
      return state.subjects;
    default:
      throw new Error(`No such view: ${state.currentView}`);
  }
}

const mapStateToProps = (state) => ({
  schools: propsFilter(state)
});

const mapDispatchToProps = (dispatch) => ({
  showSubjects: (schoolId) => {
    dispatch(showSubjects(schoolId));
  }
});

const BrowseReduxContainer = connect(mapStateToProps, mapDispatchToProps)(Browse);

export default BrowseReduxContainer;

Browse.jsx

import React from 'react';
import RaisedButton from 'material-ui/RaisedButton';

const Browse = (props) => (
  <div>
    {props.schools.map((school) => (
      <RaisedButton key={school.id} label={school.name} onClick={props.showSubjects(school.id)} />
    ))}
  </div>
);

export default Browse;

如果需要，可以在这里查看其他相关文件： https : //github.com/Joonpark13/serif.nu/tree/feature/browse

Answer 1

您的RaisedButton引起了问题：

<RaisedButton key={school.id} label={school.name} onClick={props.showSubjects(school.id)} />

您showSubjects在onClick处理程序中执行showSubjects ，而不传递引用。 相反，它应该是onClick={() => props.showSubjects(school.id)}以便仅在单击后执行该功能。

另外，您也可以修改mapDispatchToProps ：

const mapDispatchToProps = (dispatch) => ({
  showSubjects: (schoolId) => () => {
    dispatch(showSubjects(schoolId));
  }
});