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react-router-dom v6版本實現(xiàn)Tabs路由緩存切換功能

更新時間：2023年10月19日 15:51:08 作者：很甜的西瓜

今天有人問我怎么實現(xiàn)React-Router-dom類似標簽頁緩存,很久以前用的是react-router v5那個比較容易實現(xiàn),v6變化挺大,但了解react的機制和react-router的機制就容易了,本文介紹react-router-dom v6版本實現(xiàn)Tabs路由緩存切換,感興趣的朋友一起看看吧

概要

擺了半年攤，好久沒寫代碼了，今天有人問我怎么實現(xiàn)React-Router-dom類似標簽頁緩存。后面看了一下router的官網(wǎng)。很久以前用的是react-router v5那個比較容易實現(xiàn)。v6變化挺大，但了解react的機制和react-router的機制就容易了.

想做到切換標簽保留頁面的內(nèi)容不變，就要了解react的機制

首先虛擬DOM的機制就是對比，如果找不到就會重新掛載，找到了就更新。

React-Router的機制就是匹配路徑，找到了就返回對應(yīng)的路由組件，找不到返回為null

思路就是v6版本提供了Outlet這個輸出子路元素的組件

一般我們會這樣寫：

但如果要實現(xiàn)標簽的話，就不能這樣寫。但是切換路由，地址一變它就替換了原來的了。所以要做的就是保留所有打開的標簽的子路由元素：

主要目的就是保留所有的元素，隱藏路由就行，這樣react diff時，還是會找到對應(yīng)key的路由，這樣它只是會更新路由的組件，而不會重新掛載。

如這樣寫：

效果

完整代碼

新建一個html復(fù)制進去就可以運行了

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>React-router-dom tabs</title>
    <script src="https://cdn.jsdelivr.net/npm/react@18.2.0/umd/react.production.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/react-dom@18.2.0/umd/react-dom.production.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@babel/standalone@7.23.2/babel.min.js"></script>
    <link rel="stylesheet"  rel="external nofollow" >
    <script src="https://cdn.jsdelivr.net/npm/dayjs@1.11.10/dayjs.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/antd@5.10.1/dist/antd.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@ant-design/pro-components@2.6.30/dist/pro-components.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/@remix-run/router@1.10.0/dist/router.umd.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/react-router@6.17.0/dist/umd/react-router.production.min.js"></script>
    <script
        src="https://cdn.jsdelivr.net/npm/react-router-dom@6.17.0/dist/umd/react-router-dom.production.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel" data-preset="env,react">
        const { useCallback, useMemo, useEffect, useRef, useState } = React
        const { ProLayout } = ProComponents
        const { createHashRouter, useOutlet, Navigate, RouterProvider, useLocation, Link, useNavigate } = ReactRouterDOM
        const { Tabs, Button, Space, Row, Col, Input, } = antd
        const Home = () => {
            return <div>Home <Input></Input></div>
        }
        const DemoA = () => {
            return <div>DemoA <Input></Input></div>
        }
        const DemoB = () => {
            return <div>DemoB <Input></Input></div>
        }
        const ViewPage = (props) => {
            const outlet = useOutlet()
            return props.render(outlet)
        }
        const BasicLayout = () => {
            const nav = useNavigate()
            const location = useLocation()
            const route = routes[0]
            const [menuDataMap] = useState(() => new Map())
            const cacheOutletElements = useRef({}).current
            const [tabActiveKey, setTabActiveKey] = useState('')
            const [tabItems, setTabItems] = React.useState([])
            const addTab = useCallback((item) => {
                const existItem = tabItems.find(it => it.key === item.key)
                if (!existItem) {
                    setTabItems([...tabItems, {
                        key: item.key,
                        path: item.path,
                        label: item.name
                    }])
                }
                setTabActiveKey(item.key)
            }, [tabItems])
            const handleSelectMenu = useCallback((selectedKeys) => {
                console.log('handleSelectMenu', selectedKeys)
                let menuKey = selectedKeys[selectedKeys.length - 1]
                let item = menuDataMap.get(menuKey)
                if (item && item.path) {
                    addTab(item)
                }
            }, [addTab])
            const handleTabChange = useCallback((activeKey) => {
                setTabActiveKey(activeKey)
                const item = tabItems.find(d => d.key === activeKey)
                nav(item.path)
            }, [tabItems, nav])
            const handleTabEditChange = useCallback((activeKey, action) => {
                if (action === 'remove') {
                    delete cacheOutletElements[activeKey]
                    const newItems = tabItems.filter(d => d.key !== activeKey)
                    setTabItems(newItems)
                    if (newItems.length) {
                        handleTabChange(newItems[0].key)
                    }
                }
            }, [tabItems, handleTabChange])
            const renderView = useCallback((routeElement) => {
                if (!cacheOutletElements[tabActiveKey]) {
                    cacheOutletElements[tabActiveKey] = <div>{routeElement}</div>
                }
                return Object.keys(cacheOutletElements).map(key => {
                    const element = cacheOutletElements[key]
                    if (key === tabActiveKey) {
                        return React.cloneElement(element, {
                            key: key,
                            style: {
                                display: 'block'
                            }
                        })
                    } else {
                        return React.cloneElement(element, {
                            key: key,
                            style: {
                                display: 'none'
                            }
                        })
                    }
                })
            }, [cacheOutletElements, tabActiveKey])
            return <ProLayout route={route} onSelect={handleSelectMenu} location={location} menuItemRender={(item, defaultDom, menuProps) => {
                if (item.children) {
                    return defaultDom
                }
                menuDataMap.set(item.path, item)
                return <Link to={item.path}>{defaultDom}</Link>
            }}>
                <Tabs hideAdd type='editable-card' onEdit={handleTabEditChange} activeKey={tabActiveKey} onChange={handleTabChange} items={tabItems}>
                </Tabs>
                <ViewPage render={renderView}></ViewPage>
            </ProLayout>
        }
        const routes = [{
            path: '/',
            element: <BasicLayout></BasicLayout>,
            children: [
                {
                    index: true,
                    element: <Navigate to="/home"></Navigate>
                }, {
                    path: 'home',
                    name: "Home",
                    element: <Home></Home>
                }
                , {
                    path: 'a',
                    name: "DemoA",
                    element: <DemoA></DemoA>
                }
                , {
                    path: 'b',
                    name: "DemoB",
                    element: <DemoB></DemoB>
                }
            ]
        }]
        const router = createHashRouter(routes, {
        })
        const App = () => {
            return <RouterProvider router={router}></RouterProvider>
        }
        ReactDOM.createRoot(document.getElementById('app')).render(<App></App>)
    </script>
</body>
</html>

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