react怎么實現側邊欄聯動頭部導航欄效果

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項目中使用react+antd design+redux+react-reouter-dom

實現思路

編寫路由表=》循環遍歷路由表=》渲染側邊欄=》單擊側邊欄獲取相應的標簽數據=》存入redux=》遍歷循環redux數據渲染頭部導航欄

路由表

const RouterTree = [
    {
        key: 'num_one',
        title: {
            icon: '',
            text: 'text'
        },
        children: [
            {
                key: '1',
                text: 'options1',
                path: '/option1',
                component: '',
                isOutSide: true,
            }
        ]

    },
    {
        key: 'num_two',
        title: {
            icon: '',
            text: 'text'
        },
        children: [
            {
                key: '2',
                text: 'text',
                path: '/option1',
                component: '',
                isOutSide: false
            }
        ]

    },
    {
        key: 'num_three',
        title: {
            icon: '',
            text: 'text'
        },
        children: [
            {
                key: '3',
                text: 'text',
                path: '/option1',
                component: '',
                isOutSide: false
            }
        ]

    },
]
export default RouterTree

側邊欄渲染

引入路由表，循環遍歷渲染側邊欄

import React, { Component } from 'react'
import { Menu } from 'antd';
import { NavLink as Link, withRouter } from 'react-router-dom'
import RouterTree from '@/modules/route.js'

 render() {
        const { activityKey } = this.state || {}
        return (
            <div>
                <Menu
                    onClick={this.handleClick}
                    defaultSelectedKeys={['1']}
                    defaultOpenKeys={['sub1']}
                    selectedKeys={activityKey}
                    mode="inline"
                    inlineCollapsed={isToggle}
                >
                    {RouterTree.map((item, index) => {
                        return (
                            <SubMenu
                                key={item.key}
                                title={item.title.text}
                                index={index}
                            >
                                {item.children && item.children.map((menuItem, menuIndex) => {
                                    return (<Menu.Item
                                        key={menuItem.key}
                                        index={menuIndex}
                                    >
                                        {menuItem.isOutSide ? <a href='http://www.baidu.com' rel="noopener noreferrer">baidu</a> : <Link to={menuItem.path}>{menuItem.text}</Link>}
                                    </Menu.Item>)
                                })}
                            </SubMenu>)
                    })}
                </Menu>
            </div>
        )

由于單獨使用redux不便，項目中引用react-redux，redux-thunk。

這里將側邊欄拆分為兩個文件，一個是容器組件，一個為UI組件（以上的為UI組件）

容器組件（側邊欄）

容器組件為導出的組件，在容器組件中引入UI組件slide

import { connect } from 'react-redux'
import { business } from '@/tools/index.js'
import Slide from './slide'

const { processedArr } = business

const mapStoreToProps = (state) => {
    const { dynamicJump,activityKey} = state || {}
    let responseRoute = processedArr(dynamicJump)
    return {
        dynamicJump: [...responseRoute],
        activityKey:activityKey
    }
}

const mapDispatchToProps = (dispatch) => {
    return {
        updateRouter(item) {
            dispatch((dispatch) => {
                dispatch({
                    type: 'UPDATED_ROUTING', item: { ...item }
                })
            })
        },
        activityKeys(key){
            dispatch((dispatch)=>{
                dispatch({
                    type:'ACTIVITY_KEY',key:key
                })
            })
        }
    }
}

export default connect(mapStoreToProps, mapDispatchToProps)(Slide)

store

在src下新建一個store文件

import { createStore, applyMiddleware } from 'redux'
import thunk from 'redux-thunk';
import { routerMiddleware } from 'react-router-redux'

let createHistory = require('history').createBrowserHistory
let history = createHistory()
let routerWare = routerMiddleware(history)

const dynamicJump = {
    dynamicJump: '這里設置默認值'（一般存放在session中）,
    activityKey: '這里設置默認值',
}

const reducers = function (state = dynamicJump, action) {
    switch (action.type) {
        case 'UPDATED_ROUTING':
            state.dynamicJump =action.item
            break;
        case 'ACTIVITY_KEY':
            if (action.key !== undefined) {
                state.activityKey = action.key
            }
            break;
        default:
            break;
    }
    return { ...state }
}

const store = createStore(reducers, applyMiddleware(thunk, routerWare))

// 訂閱事件
store.subscribe(() => {
    let state = store.getState();
    sessionStorage.setItem('dynamicJump',JSON.stringify(state.dynamicJump))
    sessionStorage.setItem('activityKey',JSON.stringify(state.activityKey))
})

export default store

在根目錄下將其注入進去（注意文件的引入位置）

import {Provider} from 'react-redux'
import store from './store/index.js'

ReactDOM.render(
  <Provider store={store}><App /></Provider>,
  document.getElementById('root')
);

頭部導航欄

容器組件

import { connect } from 'react-redux'
import { push } from 'react-router-redux'
import { business } from '@/tools/index.js'
import Header from './head.jsx'

const { processedArr } = business

const mapStoreToProps = (state) => {
    const { dynamicJump, activityKey } = state
    let newRouteArr = processedArr(dynamicJump)
    return {
        dynamicJump: [...newRouteArr],
        activityKey: activityKey
    }
}

const mapDispatchToProps = (dispatch) => {
    return {
        removeKey(itemKey) {
            dispatch((dispatch, getStore) => {
                const { dynamicJump } = getStore() || {}
                let removeArr = processedArr(dynamicJump)
                const indexes = removeArr.findIndex((item) => item.key === itemKey)
                // 點擊頭部導航條的刪除（即刪除保存在redux的數組元素即可）
                if (removeArr.length > 1) {
                    removeArr.splice(indexes, 1)
                }
                // 刪除之后跳轉到刪除元素的前一個元素的路由地址
                let path = removeArr[indexes - 1] ? removeArr[indexes - 1].path : '/option1'
                let keys = removeArr[indexes - 1] ? removeArr[indexes - 1].key : 0
                if(keys===0){
                    keys=removeArr[0].key
                }
                dispatch({
                    type: 'UPDATED_ROUTING', item: { ...removeArr },
                })
                dispatch({
                    type: 'ACTIVITY_KEY', key: keys
                })
                // 這里進行跳轉
                dispatch(push(path))
            })
        },
        changeActiveKey(key) {
            dispatch((dispatch) => {
                dispatch({
                    type: 'ACTIVITY_KEY', key: key
                })
            })
        }
    }
}


export default connect(mapStoreToProps, mapDispatchToProps)(Header)

這里存在著：如果刪除頭部組件的其中一個導航，那么需要跳轉到該導航（刪除的）的前一個路由地址，而這個操作在UI組件中是不方便的，這里我采取的方法是引入“history”模塊（詳細代碼請移步到store.js),然后在容器組件中使用dispatch(push(path))跳轉，也可以使用更為簡單的方法，直接在容器組件中引入react-router的withRouter，包裹在最外層即：export default withRouter（connect(mapStoreToProps, mapDispatchToProps)(Header)）

UI組件

render(){
   const { dynamicJump } = this.props || {}
   const { activeKey } = this.state || {}
    <Tabs
             hideAdd
             onChange={this.onChange}
             activeKey={activeKey}
             type="line"
             onEdit={this.onEdit}
             className='tabs'
     >
                  { dynamicJump.map((item) => (
                            <TabPane tab={<Link to={item.path}>{item.text}</Link>} key={item.key} />
                    ))}
    </Tabs>
}

對于key值，可以使用react新增的鉤子函數：getDerivedStateFromProps進行判斷是否更行

static getDerivedStateFromProps(nextProps, preState) {
        const { activityKey, dynamicJump } = nextProps || {}
        const { activeKey } = preState || {}
        if (activityKey !== activeKey) {
            return {
                activeKey: activityKey
            }
        }
        return { allRoute: dynamicJump }
 }
 
 remove = targetKey => {
        this.removeKey(targetKey)
   }
  removeKey(key) {
        this.props.removeKey(key)
    }

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