Reactjs 如何使用redux在todo列表中添加todo项

Reactjs 如何使用redux在todo列表中添加todo项,reactjs,redux,react-redux,Reactjs,Redux,React Redux,我已经为我的应用程序创建了操作和减速器。我正在尝试创建一个新的todo,并希望使用redux将其保存在状态 action/index.js let taskID = 0; export const addTodo = text => { return { type: "ADD_TODO", text, id: taskID++ }; }; reducers/todos.js const todo = (state = {}, action) => { switch (ac

我已经为我的应用程序创建了
操作
减速器
。我正在尝试创建一个新的todo,并希望使用
redux
将其保存在状态

action/index.js

let taskID = 0;

export const addTodo = text => {
  return { type: "ADD_TODO", text, id: taskID++ };
};
reducers/todos.js

const todo = (state = {}, action) => {
  switch (action.type) {
    case "ADD_TODO":
      return {
        id: action.id,
        text: action.text,
        status: false
      };
    default:
      return state;
  }
};

export default todo;
reducers/index.js

import { combineReducers } from "redux";
import todos from "./todos";

const todoApp = combineReducers({ todo });

export default todoApp;
index.js

import React from "react";
import ReactDOM from "react-dom";
import App from "./App";
import registerServiceWorker from "./registerServiceWorker";
import "./index.css";

import { Provider } from "react-redux";
import { createStore } from "redux";
import todoApp from "./reducers/todos";

let store = createStore(todoApp);

ReactDOM.render(
  <Provider store={store}><App /></Provider>,
  document.getElementById("root")
);
registerServiceWorker();
从“React”导入React;
从“react dom”导入react dom;
从“/App”导入应用程序;
从“/registerServiceWorker”导入registerServiceWorker;
导入“/index.css”;
从“react redux”导入{Provider};
从“redux”导入{createStore};
从“/reducers/todos”导入todoApp;
let store=createStore(todoApp);
ReactDOM.render(
,
document.getElementById(“根”)
);
registerServiceWorker();
App.js

import React, { Component } from "react";
import logo from "./logo.svg";
import "./App.css";

import AppBar from "material-ui/AppBar";
import FloatingActionButton from "material-ui/FloatingActionButton";
import MuiThemeProvider from "material-ui/styles/MuiThemeProvider";
import * as strings from "./Strings";
import * as colors from "./Colors";
import styles from "./Styles";
import ContentAdd from "material-ui/svg-icons/content/add";
import Dialog from "material-ui/Dialog";
import FlatButton from "material-ui/FlatButton";
import * as injectTapEventPlugin from "react-tap-event-plugin";
import TextField from "material-ui/TextField";
import { List, ListItem } from "material-ui/List";
import { connect } from "react";
import { addTodo } from "./actions/index";

const AppBarTest = () =>
  <AppBar
    title={strings.app_name}
    iconClassNameRight="muidocs-icon-navigation-expand-more"
    style={{ backgroundColor: colors.blue_color }}
  />;

class App extends Component {
  constructor(props) {
    injectTapEventPlugin();
    super(props);
    this.state = {
      open: false,
      todos: [],
      notetext: ""
    };
    this.handleChange = this.handleChange.bind(this);
  }

  handleOpen = () => {
    this.setState({ open: true });
  };

  handleClose = () => {
    this.setState({ open: false });
  };

  handleCreateNote = () => {
    let todos = [...this.state.todos];
    todos.push({
      id: todos.length,
      text: this.state.notetext,
      completed: false
    });
    this.setState({ todos: todos }, () => {
      // setState is async, so this is callback
    });
    this.handleClose();
  };

  handleChange(event) {
    this.setState({ [event.target.name]: event.target.value });
  }

  _renderTodos() {
    return this.state.todos.map(event => {
      return (
        <ListItem
          primaryText={event.text}
          key={event.id}
          style={{ width: "100%", textAlign: "center" }}
          onTouchTap={this._handleListItemClick.bind(this, event)}
        />
      );
    });
  }

  _handleListItemClick(item) {
    console.log(item);
  }

  render() {
    return (
      <MuiThemeProvider>
        <div>
          <AppBarTest />
          <FloatingActionButton
            style={styles.fab}
            backgroundColor={colors.blue_color}
            onTouchTap={this.handleOpen}
          >
            <ContentAdd />
          </FloatingActionButton>
          <Dialog
            open={this.state.open}
            onRequestClose={this.handleClose}
            title={strings.dialog_create_note_title}
          >
            <TextField
              name="notetext"
              hintText="Note"
              style={{ width: "48%", float: "left", height: 48 }}
              defaultValue={this.state.noteVal}
              onChange={this.handleChange}
              onKeyPress={ev => {
                if (ev.key === "Enter") {
                  this.handleCreateNote();
                  ev.preventDefault();
                }
              }}
            />

            <div
              style={{
                width: "4%",
                height: "1",
                float: "left",
                visibility: "hidden"
              }}
            />

            <FlatButton
              label={strings.create_note}
              style={{ width: "48%", height: 48, float: "left" }}
              onTouchTap={this.handleCreateNote}
            />
          </Dialog>

          <List style={{ margin: 8 }}>
            {this._renderTodos()}
          </List>

        </div>
      </MuiThemeProvider>
    );
  }
}

export default App;
import React,{Component}来自“React”;
从“/logo.svg”导入徽标;
导入“/App.css”;
从“物料界面/AppBar”导入AppBar;
从“物料界面/浮动操作按钮”导入浮动操作按钮;
从“材质ui/styles/MuiThemeProvider”导入MuiThemeProvider;
将*作为字符串从“/strings”导入;
从“/colors”导入*作为颜色;
从“/styles”导入样式;
从“材质ui/svg图标/content/add”导入ContentAdd;
从“物料界面/对话框”导入对话框;
从“物料界面/平面按钮”导入平面按钮;
从“react-tap事件插件”导入*作为injectTapEventPlugin;
从“物料界面/文本字段”导入文本字段;
从“物料界面/列表”导入{List,ListItem};
从“react”导入{connect};
从“/actions/index”导入{addTodo};
常量AppBarTest=()=>
;
类应用程序扩展组件{
建造师(道具){
injectTapEventPlugin();
超级(道具);
此.state={
开:错,
待办事项:[],
注:文本:“
};
this.handleChange=this.handleChange.bind(this);
}
handleOpen=()=>{
this.setState({open:true});
};
handleClose=()=>{
this.setState({open:false});
};
handleCreateNote=()=>{
让todos=[…this.state.todos];
推({
id:todos.length,
text:this.state.notetext,
已完成:false
});
this.setState({todos:todos},()=>{
//setState是异步的,所以这是回调
});
这个;
};
手变(活动){
this.setState({[event.target.name]:event.target.value});
}
_renderTodos(){
返回此.state.todos.map(事件=>{
返回(
);
});
}
_handleListItemClick(项目){
控制台日志(项目);
}
render(){
返回(
{
如果(ev.key==“输入”){
this.handleCreateNote();
ev.preventDefault();
}
}}
/>
{this.\u renderTodos()}
);
}
}
导出默认应用程序;
我想在
handleCreateNote
函数中保存新的todo,我不知道如何使用store,在这里调度以将其保存在state中。有人能帮我吗?

换衣服

导出默认应用程序

您还应该使用导入所有操作

import * as actions from './action/index';
完成所有这些操作后,请按如下方式修改此函数:-

handleCreateNote = () => {
    let todos = [...this.state.todos];
    let newTodo = {
      id: todos.length,
      text: this.state.notetext,
      completed: false
    };
    todos.push(newTodo);
    this.setState({ todos: todos }, () => {
      // setState is async, so this is callback
    });
    this.props.addTodo(this.state.notetext);
    this.handleClose();
  };
此外,您添加TODO的逻辑也不正确。 所以你的动作创造者应该是这样的

let taskID = 0;

export const addTodo = text => {
  return { 
    type: "ADD_TODO", 
    text: text,
    id: taskId++
  };
};
现在减速器也需要更换,所以应该是这样的:-

const todo = (state = [], action) => {
  switch (action.type) {
    case "ADD_TODO":
      let newTodo = {
        id: action.id,
        text: action.text,
        status: false
      };
      return [...state, newTodo]
    default:
      return state;
  }
};

export default todo;

我希望这会有帮助。不是最好的实现,但是可以解决您的问题。

我可以推荐使用redux创建应用程序时几乎所有的操作都由哪个来处理。我想检查
handleCreateNote中的redux状态值是什么方法?您可以这样做。props.todo来检查状态。如果我想检查完整的存储,有什么方法吗?正如我的
letstore=createStore(todoApp)
index.js
中,我想在另一个js文件中访问它以进行调试。这一行表示您的存储只有一个密钥常量todoApp=combineReducers({todo});如果您希望MapStateTops方法中的完整存储,只需返回完整的状态对象。正如我现在所做的返回{todo:todo},只需将其更改为返回{state:state}
const todo = (state = [], action) => {
  switch (action.type) {
    case "ADD_TODO":
      let newTodo = {
        id: action.id,
        text: action.text,
        status: false
      };
      return [...state, newTodo]
    default:
      return state;
  }
};

export default todo;