使用React实现左侧菜单栏

antd专门为react定制的中后台组件库，提供了大量的组件供开发者使用，

• 官网地址 点击跳转
• 在中后台中，菜单项是必不可少的，今天就使用react结合antd配置一个菜单栏目

先定义好路由结构

const Router = [{
        title: '控制台',
        icon: 'laptop',
        key: '/index',
        role: ["user", "information", "product"]
    },
    {
        title: '用户管理',
        icon: 'laptop',
        key: '/index/user', // 菜单
        role: ["information", "user"], // 角色 
        child: [{
                key: '/index/user/list',
                title: '用户列表',
                icon: '',
                role: ["user"]
            },
            {
                key: '/index/user/add',
                title: '添加用户',
                icon: '',
                role: ["user"]
            }
        ]
    },
    {
        title: '部门管理',
        icon: 'bars',
        key: '/index/department',
        role: ["user"],
        child: [{
                key: '/index/department/list',
                title: '部门列表',
                icon: '',
                role: ["user"]
            },
            {
                key: '/index/department/add',
                title: '添加部门',
                icon: '',
                role: ["user"]
            },
        ]
    },
    {
        title: '加班',
        icon: 'info-circle-o',
        key: '/home/abouta'
    }
]
export default Router;

使用antd提供的Menu

• 这个需要考虑一些情况，当路由有一级菜单或者下面的子菜单需要处理
• 引入router文件,通过map遍历循环
• 通过map遍历，判断是否有二级菜单

-

import Router from './../../router/index'

import {  Menu } from 'antd';
const { SubMenu } = Menu;

<Menu
                    onOpenChange={this.openMenu}
                    onClick={this.selectMenu}
                    theme="dark"
                    mode="inline"
                    selectedKeys={selectedKeys}
                    openKeys={openKeys}
                    style={{ height: '100%', borderRight: 0 }}
                    >
                    {
                        Router && Router.map(firstItem => {
                            return firstItem.child && firstItem.child.length > 0 ? this.renderSubMnenu(firstItem) : this.renderMenu(firstItem)
                        }) 
                    }
                    
                    </Menu>

• 处理一级菜单

    renderMenu =({title,key}) => {
        return (
            <Menu.Item key={key}>
                <Link to={key}>
                    <span>{title}</span>
                </Link>
            </Menu.Item>
        )
    }   

• 处理子级菜单栏 递归

    renderSubMnenu = ({title,key,child}) => {
        return (
            <SubMenu key={key} title={title}>
                {
                    child && child.map(item => {
                        return item.child && item.child.length > 0 ? this.renderSubMnenu(item) : this.renderMenu(item)
                    })
                }
            </SubMenu>
        )
        
    }

处理菜单选择，高亮，刷新保持选中状态

• 根据antd提供的api 去操作
• selectedKeys 当前选中的菜单项 key 数组 openKeys, 当前展开的 SubMenu 菜单项 key 数组

constructor(props) {
        super(props);
        this.state= {
            selectedKeys:[],
            openKeys:[]
        }
    }

    componentDidMount(){
        // 菜单状态
        const pathname = this.props.location.pathname;
        const menukey = pathname.split("/").slice(0,3).join('/');

        const menuHigh = {
            selectedKeys: pathname,
            openKeys: menukey
        }
        this.selectMenuHigh(menuHigh)
    }

    selectMenu =({item,key,keyPath}) => {
        // 选中菜单
        const menuHigh = {
            selectedKeys: key,
            openKeys: keyPath[keyPath.length - 1]
        }
        this.selectMenuHigh(menuHigh)
    }

    openMenu = (openKeys) => {
        // 展开
        this.setState({
            openKeys: [openKeys[openKeys.length - 1]]
        })
    }


    selectMenuHigh = ({selectedKeys,openKeys}) => {
        // 菜单高亮
        this.setState({
            selectedKeys: [selectedKeys],
            openKeys: [openKeys]
        })
    }

• 完整代码

import React, { Component,Fragment } from 'react'
import {Link,withRouter} from 'react-router-dom'
import Router from './../../router/index'

import {  Menu } from 'antd';
const { SubMenu } = Menu;

class AsideMenu extends Component {
    constructor(props) {
        super(props);
        this.state= {
            selectedKeys:[],
            openKeys:[]
        }
    }

    componentDidMount(){
        // 菜单状态
        const pathname = this.props.location.pathname;
        const menukey = pathname.split("/").slice(0,3).join('/');

        const menuHigh = {
            selectedKeys: pathname,
            openKeys: menukey
        }
        this.selectMenuHigh(menuHigh)
    }

    selectMenu =({item,key,keyPath}) => {
        // 选中菜单
        const menuHigh = {
            selectedKeys: key,
            openKeys: keyPath[keyPath.length - 1]
        }
        this.selectMenuHigh(menuHigh)
    }

    openMenu = (openKeys) => {
        // 展开
        this.setState({
            openKeys: [openKeys[openKeys.length - 1]]
        })
    }


    selectMenuHigh = ({selectedKeys,openKeys}) => {
        // 菜单高亮
        this.setState({
            selectedKeys: [selectedKeys],
            openKeys: [openKeys]
        })
    }

    // 处理一级菜单栏
    renderMenu =({title,key}) => {
        return (
            <Menu.Item key={key}>
                <Link to={key}>
                    <span>{title}</span>
                </Link>
            </Menu.Item>
        )
    }   
    // 处理子级菜单栏
    renderSubMnenu = ({title,key,child}) => {
        return (
            <SubMenu key={key} title={title}>
                {
                    child && child.map(item => {
                        return item.child && item.child.length > 0 ? this.renderSubMnenu(item) : this.renderMenu(item)
                    })
                }
            </SubMenu>
        )
        
    }
    render() {
        const { selectedKeys,openKeys } = this.state
        return (
            <Fragment>
                <Menu
                    onOpenChange={this.openMenu}
                    onClick={this.selectMenu}
                    theme="dark"
                    mode="inline"
                    selectedKeys={selectedKeys}
                    openKeys={openKeys}
                    style={{ height: '100%', borderRight: 0 }}
                    >
                    {
                        Router && Router.map(firstItem => {
                            return firstItem.child && firstItem.child.length > 0 ? this.renderSubMnenu(firstItem) : this.renderMenu(firstItem)
                        }) 
                    }
                    
                    </Menu>
            </Fragment>
        )
    }
}
export default withRouter(AsideMenu)