How to implement left menu in react

How to implement the left menu in react: 1. Define the routing structure, code such as "const Router = [{title: '',icon: 'laptop',...}]"; 2. Import router file, loop through map traversal; 3. Process the first-level menu and sub-level menu bar, code such as "renderSubMnenu = ({title,key,child}) => {...}".

#The operating environment of this tutorial: Windows 10 system, react18 version, Dell G3 computer.

How to implement the left menu in react?

Use React to implement the left menu bar

Introduction: Use React to implement the left menu bar

antd is specially customized for react The background component library provides a large number of components for developers to use.

• Official website addressClick to jump

• in In the middle and backend, menu items are essential. Today, we will use react combined with antd to configure a menu column

First define the routing structure

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;

Use the one provided by antd Menu

• This needs to be considered in some situations. When the route has a first-level menu or the submenu below needs to be processed

• Introduce the router file and traverse it through map Loop

• Traverse through the map to determine whether there is a second-level menu

-

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: &#39;100%&#39;, borderRight: 0 }}
                    >
                    {
                        Router && Router.map(firstItem => {
                            return firstItem.child && firstItem.child.length > 0 ? this.renderSubMnenu(firstItem) : this.renderMenu(firstItem)
                        }) 
                    }
                    
                    </Menu>

Processing the first-level menu

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

Processing sub-menu bar recursion

  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>
        )
        
    }

Processing menu selection, highlighting, refreshing and keeping the selected state

• Operation based on the api provided by antd

• selectedKeys The currently selected menu item key array openKeys, the currently expanded SubMenu menu item key array

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]
        })
    }

Complete code

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 (
            
                
                    {
                        Router && Router.map(firstItem => {
                            return firstItem.child && firstItem.child.length > 0 ? this.renderSubMnenu(firstItem) : this.renderMenu(firstItem)
                        }) 
                    }
                    
                    
            
        )
    }
}
export default withRouter(AsideMenu)

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