实操《深入浅出React和Redux》第三期--Redux
天飞 2017-12-03 22:07:59 浏览17 评论0react redux string Render BIND
摘要: 尽管还没有到react-redux,但感觉已经很兴奋啦。 前端工程组件化编程思想, 确实也经历过越来越多的场景, 也越来越标准了。 这里涉及的是redux的基础应用,傻瓜和聪明组件,全局context。
尽管还没有到react-redux,但感觉已经很兴奋啦。
前端工程组件化编程思想,
确实也经历过越来越多的场景,
也越来越标准了。
这里涉及的是redux的基础应用,傻瓜和聪明组件,全局context。
就不完全收录代码了。
十点过了嘛~~
这里只记录几个重要的点吧。
Provider.js
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import ControlPanel from './views/ControlPanel';
import store from './Store';
import Provider from './Provider';
import registerServiceWorker from './registerServiceWorker';
ReactDOM.render(
<Provider store={store}>
<ControlPanel />
</Provider>, document.getElementById('root'));
registerServiceWorker();
Reducer.js
import * as ActionTypes from './ActionTypes';
export default (state, action) => {
const {counterCaption} = action;
switch (action.type) {
case ActionTypes.INCREMENT:
return {...state, [counterCaption]: state[counterCaption] + 1};
case ActionTypes.DECREMENT:
return {...state, [counterCaption]: state[counterCaption] - 1};
default:
return state
}
} Store.js
import {createStore} from 'redux';
import reducer from './Reducer';
const initValues = {
'First': 0,
'Second': 10,
'Third': 20
};
const store = createStore(reducer, initValues);
export default store; Counter.js
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import * as Actions from '../Actions.js';
const buttonStyle = {
margin: '10px'
};
const propTypes = {
caption: PropTypes.string.isRequired
};
class Counter extends Component {
render() {
const {caption, onIncrement, onDecrement, value} = this.props;
return (
<div>
<button style={buttonStyle} onClick={onIncrement}>+</button>
<button style={buttonStyle} onClick={onDecrement}>-</button>
<span> { caption } count: {value}</span>
</div>
);
}
}
Counter.propTypes = {
caption: PropTypes.string.isRequired,
onIncrement: PropTypes.func.isRequired,
onDecrement: PropTypes.func.isRequired,
value: PropTypes.number.isRequired
};
class CounterContainer extends Component {
constructor(props, context) {
super(props, context);
this.onIncrement = this.onIncrement.bind(this);
this.onDecrement = this.onDecrement.bind(this);
this.onChange = this.onChange.bind(this);
this.getOwnState = this.getOwnState.bind(this);
this.state = this.getOwnState();
}
shouldComponentUpdate(nextProps, nextState) {
return (nextProps.caption !== this.props.caption) ||
(nextState.value !== this.state.value);
}
componentDidMount() {
this.context.store.subscribe(this.onChange);
}
componentWillUnmout() {
this.context.store.unsubscribe(this.onChange);
}
onChange() {
this.setState(this.getOwnState());
}
getOwnState() {
return {
value: this.context.store.getState()[this.props.caption]
};
}
onIncrement() {
this.context.store.dispatch(Actions.increment(this.props.caption));
}
onDecrement() {
this.context.store.dispatch(Actions.decrement(this.props.caption));
}
render() {
return <Counter caption={this.props.caption}
onIncrement={this.onIncrement}
onDecrement={this.onDecrement}
value={this.state.value} />
}
}
CounterContainer.propTypes = {
caption: PropTypes.string.isRequired
};
CounterContainer.contextTypes = {
store: PropTypes.object
}
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