需求

是要做一個tag，當(dāng)切換頁面的時候保留狀態(tài)。

效果圖：

思路

既然涉及了router跳轉(zhuǎn)，那我們就去查api 發(fā)現(xiàn)keep-alive，巧了就用它吧。這里我們用到了include屬性，該屬性接受一個數(shù)組，當(dāng)組件的name名稱包含在inclue里的時候就會觸發(fā)keep-alive。

import { Vue, Component, Watch, Mixins } from ’vue-property-decorator’;// 此處省略n行代碼// 這是個計(jì)算屬性。（至于為什么這么寫 這里就不介紹了。）get cachedViews():string[] { return this.$store.state.tagsView.cachedViews;}// 此處省略n行代碼<keep-alive :include='cachedViews'> <router-view :key='key'></router-view></keep-alive>

那我們接下來就處理cachedViews變量就好了。

vuex實(shí)現(xiàn)

import { Route } from ’vue-router’; // 檢測規(guī)則interface TagsState{ visitedViews: Route[]; cachedViews: string[];}const state = (): TagsState => ({ visitedViews: [], // 展示的菜單 cachedViews: [], // 緩存菜單 用來activeed});const mutations = { ADD_VISITED_VIEW: (state: TagsState, view: Route) => { if (state.visitedViews.some((v: any) => v.path === view.path)) { return; } state.visitedViews.push( Object.assign({}, view, { title: view.meta.title || ’no-name’, }), ); }, ADD_CACHED_VIEW: (state: TagsState, view: Route) => { if (state.cachedViews.includes(view.meta.name)) { return; } if (!view.meta.noCache) { state.cachedViews.push(view.meta.name); } }, DEL_VISITED_VIEW: (state: TagsState, view: Route) => { for (const [i, v] of state.visitedViews.entries()) { if (v.path === view.path) { state.visitedViews.splice(i, 1); break; } } }, DEL_CACHED_VIEW: (state: TagsState, view: Route) => { const index = state.cachedViews.indexOf(view.meta.name); index > -1 && state.cachedViews.splice(index, 1); }, DEL_OTHERS_VISITED_VIEWS: (state: TagsState, view: Route) => { state.visitedViews = state.visitedViews.filter((v: any) => { return v.meta.affix || v.path === view.path; }); }, DEL_OTHERS_CACHED_VIEWS: (state: TagsState, view: Route) => { const index = state.cachedViews.indexOf(view.meta.name); if (index > -1) { state.cachedViews = state.cachedViews.slice(index, index + 1); } else { // if index = -1, there is no cached tags state.cachedViews = []; } }, DEL_ALL_VISITED_VIEWS: (state: TagsState) => { // keep affix tags const affixTags = state.visitedViews.filter((tag: any) => tag.meta.affix); state.visitedViews = affixTags; }, DEL_ALL_CACHED_VIEWS: (state: TagsState) => { state.cachedViews = []; }, UPDATE_VISITED_VIEW: (state: TagsState, view: Route) => { for (let v of state.visitedViews) { if (v.path === view.path) { v = Object.assign(v, view); break; } } },};const actions = { addView({ dispatch }: any, view: Route) { dispatch(’addVisitedView’, view); dispatch(’addCachedView’, view); }, addVisitedView({ commit }: any, view: Route) { commit(’ADD_VISITED_VIEW’, view); }, addCachedView({ commit }: any, view: Route) { commit(’ADD_CACHED_VIEW’, view); }, delView({ dispatch, state }: any, view: Route) { return new Promise((resolve) => { dispatch(’delVisitedView’, view); dispatch(’delCachedView’, view); resolve({ visitedViews: [...state.visitedViews], cachedViews: [...state.cachedViews], }); }); }, delVisitedView({ commit, state }: any, view: Route) { return new Promise((resolve) => { commit(’DEL_VISITED_VIEW’, view); resolve([...state.visitedViews]); }); }, delCachedView({ commit, state }: any, view: Route) { return new Promise((resolve) => { commit(’DEL_CACHED_VIEW’, view); resolve([...state.cachedViews]); }); }, delOthersViews({ dispatch, state }: any, view: Route) { return new Promise((resolve) => { dispatch(’delOthersVisitedViews’, view); dispatch(’delOthersCachedViews’, view); resolve({ visitedViews: [...state.visitedViews], cachedViews: [...state.cachedViews], }); }); }, delOthersVisitedViews({ commit, state }: any, view: Route) { return new Promise((resolve) => { commit(’DEL_OTHERS_VISITED_VIEWS’, view); resolve([...state.visitedViews]); }); }, delOthersCachedViews({ commit, state }: any, view: Route) { return new Promise((resolve) => { commit(’DEL_OTHERS_CACHED_VIEWS’, view); resolve([...state.cachedViews]); }); }, delAllViews({ dispatch, state }: any, view: Route) { return new Promise((resolve) => { dispatch(’delAllVisitedViews’, view); dispatch(’delAllCachedViews’, view); resolve({ visitedViews: [...state.visitedViews], cachedViews: [...state.cachedViews], }); }); }, delAllVisitedViews({ commit, state }: any) { return new Promise((resolve) => { commit(’DEL_ALL_VISITED_VIEWS’); resolve([...state.visitedViews]); }); }, delAllCachedViews({ commit, state }: any) { return new Promise((resolve) => { commit(’DEL_ALL_CACHED_VIEWS’); resolve([...state.cachedViews]); }); }, updateVisitedView({ commit }: any, view: Route) { commit(’UPDATE_VISITED_VIEW’, view); },};export default { namespaced: true, state, mutations, actions,};

上面代碼，我們定義了一系列的對標(biāo)簽的操作。

組件實(shí)現(xiàn)

組件解構(gòu)如圖

TheTagsView.vue

<script lang='ts'>/** * @author leo * @description #15638 【test_tabs 組件】tab組件 */import { Component, Vue, Prop, Watch, Mixins } from ’vue-property-decorator’;import ScrollPane from ’./ScrollPane.vue’;import path from ’path’;@Component({ components: { ScrollPane, },})export default class TheTagsView extends Vue { get visitedViews() { return this.$store.state.tagsView.visitedViews; // 點(diǎn)開過的視圖 } get routes() { return this.$store.state.permission.routes; } public visible: boolean = false; // 標(biāo)簽右鍵列表顯示隱藏 public top: number = 0; // transform定位 public left: number = 0; // transform定位 public selectedTag: any = {}; // 當(dāng)前活躍的標(biāo)簽 public affixTags: any[] = []; // 所有標(biāo)簽 @Watch(’$route’) public watchRoute() { this.addTags(); // 新增當(dāng)前標(biāo)簽 this.moveToCurrentTag(); // 刪除原活動標(biāo)簽 } @Watch(’visible’) public watchVisible(value: any) { if (value) { document.body.addEventListener(’click’, this.closeMenu); } else { document.body.removeEventListener(’click’, this.closeMenu); } } public isActive(route: any) { // 是否當(dāng)前活動 return route.path === this.$route.path; } public isAffix(tag: any) { // 是否固定 return tag.meta && tag.meta.affix; } // 過濾當(dāng)前標(biāo)簽于路由 public filterAffixTags(routes: any, basePath = ’/’) { let tags: any = []; routes.forEach((route: any) => { if (route.meta && route.meta.affix) { const tagPath = path.resolve(basePath, route.path); tags.push({ fullPath: tagPath, path: tagPath, name: route.name, meta: { ...route.meta }, }); } if (route.children) { const tempTags = this.filterAffixTags(route.children, route.path); if (tempTags.length >= 1) { tags = [...tags, ...tempTags]; } } }); return tags; } public addTags() { const { name } = this.$route; if (name) { this.$store.dispatch(’tagsView/addView’, this.$route); } return false; } public moveToCurrentTag() { const tags: any = this.$refs.tag; this.$nextTick(() => { if (tags) { for (const tag of tags) { if (tag.to.path === this.$route.path) { (this.$refs.scrollPane as any).moveToTarget(tag); // when query is different then update if (tag.to.fullPath !== this.$route.fullPath) { this.$store.dispatch(’tagsView/updateVisitedView’, this.$route); } break; } } } }); } public refreshSelectedTag(view: any) { this.$store.dispatch(’tagsView/delCachedView’, view).then(() => { const { fullPath } = view; this.$nextTick(() => { this.$router.replace({ path: ’/redirect’ + fullPath, }); }); }); } public closeSelectedTag(view: any) { this.$store.dispatch(’tagsView/delView’, view).then(({ visitedViews }) => { if (this.isActive(view)) { this.toLastView(visitedViews, view); } }); } public closeOthersTags() { this.$router.push(this.selectedTag); this.$store.dispatch(’tagsView/delOthersViews’, this.selectedTag).then(() => { this.moveToCurrentTag(); }); } public closeAllTags(view: any) { this.$store.dispatch(’tagsView/delAllViews’).then(({ visitedViews }) => { if (this.affixTags.some((tag) => tag.path === view.path)) { return; } this.toLastView(visitedViews, view); }); } public toLastView(visitedViews: any , view: any) { const latestView = visitedViews.slice(-1)[0]; if (latestView) { this.$router.push(latestView.fullPath); } else { // now the default is to redirect to the home page if there is no tags-view, // you can adjust it according to your needs. if (view.name === ’Dashboard’) { // to reload home page this.$router.replace({ path: ’/redirect’ + view.fullPath }); } else { this.$router.push(’/’); } } } public openMenu(tag: any , e: any) { const menuMinWidth = 105; const offsetLeft = this.$el.getBoundingClientRect().left; // container margin left const offsetWidth = this.$el.offsetWidth; // container width const maxLeft = offsetWidth - menuMinWidth; // left boundary const left = e.clientX - offsetLeft + 15 + 160; // 15: margin right if (left > maxLeft) { this.left = maxLeft; } else { this.left = left; } this.top = e.clientY; this.visible = true; this.selectedTag = tag; } public closeMenu() { this.visible = false; } public mounted() { this.initTags(); this.addTags(); // 添加當(dāng)前頁面tag }}</script><template> <div class='tags-view-container'> <scroll-pane ref='scrollPane' class='tags-view-wrapper'> <router-link v-for='(tag, index) in visitedViews' ref='tag' :key='tag.path' : :to='{ path: tag.path, query: tag.query, fullPath: tag.fullPath }' tag='span' @click.middle.native='!isAffix(tag)?closeSelectedTag(tag):’’' @contextmenu.prevent.native='openMenu(tag,$event)' > {{ tag.title }} <!-- <span v-if='!isAffix(tag)' @click.prevent.stop='closeSelectedTag(tag)' /> --> <span v-if='index!==visitedViews.length-1'></span> </router-link> </scroll-pane> <ul v-show='visible' : class='contextmenu'> <li @click='refreshSelectedTag(selectedTag)'>刷新</li> <li v-if='!isAffix(selectedTag)' @click='closeSelectedTag(selectedTag)'>關(guān)閉當(dāng)前標(biāo)簽</li> <li @click='closeOthersTags'>關(guān)閉其他標(biāo)簽</li> <li @click='closeAllTags(selectedTag)'>關(guān)閉所有</li> </ul> </div></template><style lang='less' scoped>.tags-view-container { height: 46px; width: 100%; background: #fff; .tags-view-wrapper { position: relative; .tags-view-item { display: inline-block; position: relative; cursor: pointer; height: 46px; line-height: 46px; // border: 1px solid #d8dce5; color: #495060; background: #fff; padding: 0 4px; font-size: 14px; .tab-border { display: inline-block; height: 10px; width: 1px; background: #f1f1f1; margin-left: 4px; } &:hover { border-bottom: 2px solid #666; } &.active { // background-color: #1F1A16; border-bottom: 2px solid #1F1A16; color: #333; // border-color: #1F1A16; // &::before { // content: ’’; // background: #fff; // display: inline-block; // width: 8px; // height: 8px; // border-radius: 50%; // position: relative; // margin-right: 2px; // } } } } .contextmenu { margin: 0; background: #fff; z-index: 3000; position: absolute; list-style-type: none; padding: 5px 0; border-radius: 4px; font-size: 12px; font-weight: 400; color: #333; box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3); li { margin: 0; padding: 7px 16px; cursor: pointer; &:hover { background: #eee; } } }}</style><style lang='less'>//reset element css of el-icon-close.tags-view-wrapper { .tags-view-item { .el-icon-close { width: 16px; height: 16px; vertical-align: 3px; border-radius: 50%; text-align: center; transition: all .3s cubic-bezier(.645, .045, .355, 1); transform-origin: 100% 50%; &:before { transform: scale(.6); display: inline-block; vertical-align: -3px; } &:hover { background-color: #b4bccc; color: #fff; } } } .el-scrollbar__bar{ pointer-events: none; opacity: 0; }}</style>

ScrollPane.vue

<script lang='ts'>/** * @author leo * @description #15638 【test_tabs 組件】tab組件 */import { Component, Vue, Prop, Watch, Mixins } from ’vue-property-decorator’;const tagAndTagSpacing = 4; // tagAndTagSpacing@Component({ components: { ScrollPane, },})export default class ScrollPane extends Vue { get scrollWrapper() { return (this.$refs.scrollContainer as any).$refs.wrap; } public left: number = 0; public handleScroll(e: any) { const eventDelta = e.wheelDelta || -e.deltaY * 40; const $scrollWrapper = this.scrollWrapper; $scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4; } public moveToTarget(currentTag: any) { const $container = (this.$refs.scrollContainer as any).$el; const $containerWidth = $container.offsetWidth; const $scrollWrapper = this.scrollWrapper; const tagList: any = this.$parent.$refs.tag; let firstTag = null; let lastTag = null; // find first tag and last tag if (tagList.length > 0) { firstTag = tagList[0]; lastTag = tagList[tagList.length - 1]; } if (firstTag === currentTag) { $scrollWrapper.scrollLeft = 0; } else if (lastTag === currentTag) { $scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth; } else { // find preTag and nextTag const currentIndex = tagList.findIndex((item: any) => item === currentTag); const prevTag = tagList[currentIndex - 1]; const nextTag = tagList[currentIndex + 1]; // the tag’s offsetLeft after of nextTag const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing; // the tag’s offsetLeft before of prevTag const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing; if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) { $scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth; } else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) { $scrollWrapper.scrollLeft = beforePrevTagOffsetLeft; } } }}</script><template> <el-scrollbar ref='scrollContainer' :vertical='false' @wheel.native.prevent='handleScroll'> <slot /> </el-scrollbar></template><style lang='less' scoped>.scroll-container { white-space: nowrap; position: relative; overflow: hidden; width: 100%; .el-scrollbar__bar { bottom: 0px; } .el-scrollbar__wrap { height: 49px; }}</style>

index.ts

import TheTagsView from ’./TheTagsView.vue’;export default TheTagsView;

這樣我們的組件就寫完啦，有哪里有問題的小伙伴可以留言哦。

組件調(diào)用

因?yàn)槭侨值模苑旁谌窒轮苯诱{(diào)用就好了

總結(jié)

這樣我們一個簡單的能實(shí)現(xiàn)alive 頁面的tag功能就實(shí)現(xiàn)了。大家趕緊嘗試一下吧~

兄臺，請留步。這里有幾點(diǎn)要注意一下哦~

問題1： 開發(fā)環(huán)境緩存住了，線上環(huán)境不好用了

我們是根據(jù)組件name值是否是include里包含的來判斷的。但是你會發(fā)現(xiàn)生產(chǎn)的的時候 class后面的名在線上被打包后變了。 什么？！這豈不是緩存不住了？？？是的。 所以解決辦法如圖。一般人我不告訴他0.o

問題2： tags的顯示名字我在哪定義呢

tags顯示的名字我怎么定義呢，好問題。小兄弟肯定沒有仔細(xì)讀代碼

ADD_VISITED_VIEW: (state: TagsState, view: Route) => { if (state.visitedViews.some((v: any) => v.path === view.path)) { return; } state.visitedViews.push( Object.assign({}, view, { title: view.meta.title || ’no-name’, /// 我在這里！！！！！ }), ); },

由上圖我們可知，我是在路由的配置里mate標(biāo)簽里的tile里配置的。至于你，隨你哦~

{ path: ’index’, // 入口 name: ’common-home-index-index’, component: () => import(/* webpackChunkName: 'auth' */ ’@/views/home/index.vue’), meta: { title: ’首頁’, // 看見了么，我就是你要顯示的名字 name: ’CommonHome’, // 記住，我要跟你的上面name頁面組件名字一樣 },}

問題3：我有的頁面，跳路由后想刷新了怎么辦

那我們頁面緩存住了，我怎么讓頁面刷新呢，比如我新增頁面，新增完了需要關(guān)閉當(dāng)前頁面跳回列表頁面的，我們的思路就是，關(guān)閉標(biāo)簽，url參數(shù)添加refresh參數(shù)

this.$store .dispatch(’tagsView/delView’, this.$route) .then(({ visitedViews }) => { EventBus.$emit(’gotoOwnerDeliveryOrderIndex’, { refresh: true, }); });

然后在activated鉤子里判斷下是否有這個參數(shù)，

this.$route.query.refresh && this.fetchData();

記得處理完結(jié)果后吧refresh刪了，不然每次進(jìn)來都刷新了，我們是在拉去數(shù)據(jù)的混合里刪的

if ( this.$route.query.refresh ) { this.$route.query.refresh = ’’;}

問題4：有沒有彩蛋啊

有的，請看圖。 我的哥乖乖，怎么實(shí)現(xiàn)的呢。這個留給你們研究吧。上面代碼已經(jīng)實(shí)現(xiàn)了。只不過你需要在加一個頁面，跟路由。其實(shí)就是跳轉(zhuǎn)到一個新空頁面路由。重新跳回來一下~

redirect/index.vue

<script lang='ts'>import { Component, Vue, Prop, Watch, Mixins } from ’vue-property-decorator’;@Componentexport default class Redirect extends Vue { public created() { const { params, query } = this.$route; const { path } = params; // debugger; this.$router.replace({ path: ’/’ + path, query }); }}</script><template></template>

/** * 刷新跳轉(zhuǎn)路由 */export const redirectRouter: any = { path: ’/redirect’, name: ’redirect’, component: RouterView, children: [ { path: ’/redirect/:path*’, component: () => import(/* webpackChunkName: 'redirect' */ ’@/views/redirect/index.vue’), meta: { title: ’title’, }, }, ],};

參考

https://github.com/PanJiaChen/vue-element-admin

到此這篇關(guān)于實(shí)用的 vue tags 創(chuàng)建緩存導(dǎo)航的過程的文章就介紹到這了,更多相關(guān)實(shí)用的 vue tags 創(chuàng)建緩存導(dǎo)航的過程內(nèi)容請搜索好吧啦網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持好吧啦網(wǎng)！