需求
是要做一个tag,当切换页面的时候保留状态。
效果图:
思路
既然涉及了router跳转,那我们就去查api 发现keep-alive,巧了就用它吧。这里我们用到了include属性,该属性接受一个数组,当组件的name名称包含在inclue里的时候就会触发keep-alive。
import { Vue, Component, Watch, Mixins } from 'vue-property-decorator'; // 此处省略n行代码 // 这是个计算属性。(至于为什么这么写 这里就不介绍了。) get cachedViews():string[] { return this.$store.state.tagsView.cachedViews; } // 此处省略n行代码 <keep-alive :include="cachedViews"> <router-view :key="key"></router-view> </keep-alive>
那我们接下来就处理cachedViews变量就好了。
vuex实现
import { Route } from 'vue-router'; // 检测规则 interface TagsState{ visitedViews: Route[]; cachedViews: string[]; } const state = (): TagsState => ({ visitedViews: [], // 展示的菜单 cachedViews: [], // 缓存菜单 用来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, };
上面代码,我们定义了一系列的对标签的操作。
组件实现
组件解构如图
TheTagsView.vue
<script lang="ts"> /** * @author leo * @description #15638 【test_tabs 组件】tab组件 */ 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; // 点开过的视图 } get routes() { return this.$store.state.permission.routes; } public visible: boolean = false; // 标签右键列表显示隐藏 public top: number = 0; // transform定位 public left: number = 0; // transform定位 public selectedTag: any = {}; // 当前活跃的标签 public affixTags: any[] = []; // 所有标签 @Watch('$route') public watchRoute() { this.addTags(); // 新增当前标签 this.moveToCurrentTag(); // 删除原活动标签 } @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) { // 是否当前活动 return route.path === this.$route.path; } public isAffix(tag: any) { // 是否固定 return tag.meta && tag.meta.affix; } // 过滤当前标签于路由 public filterAffixTags(routes: any, basePath = '/') { let tags: any = []; routes.forEach((route: any) => { if (route.meta && route.meta.affix) { const tagPath = path.resolve(basePath, route.path); tags.push({ fullPath: tagPath, path: tagPath, name: route.name, meta: { ...route.meta }, }); } if (route.children) { const tempTags = this.filterAffixTags(route.children, route.path); if (tempTags.length >= 1) { tags = [...tags, ...tempTags]; } } }); return tags; } public addTags() { const { name } = this.$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.$el.offsetWidth; // container width const maxLeft = offsetWidth - menuMinWidth; // left boundary const left = e.clientX - offsetLeft + 15 + 160; // 15: margin right if (left > maxLeft) { this.left = maxLeft; } else { this.left = left; } this.top = e.clientY; this.visible = true; this.selectedTag = tag; } public closeMenu() { this.visible = false; } public mounted() { this.initTags(); this.addTags(); // 添加当前页面tag } } </script> <template> <div id="tags-view-container" class="tags-view-container"> <scroll-pane ref="scrollPane" class="tags-view-wrapper"> <router-link v-for="(tag, index) in visitedViews" ref="tag" :key="tag.path" :class="isActive(tag)" :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }" tag="span" class="tags-view-item" @click.middle.native="!isAffix(tag)" @contextmenu.prevent.native="openMenu(tag,$event)" > {{ tag.title }} <!-- <span v-if="!isAffix(tag)" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)" /> --> <span class="tab-border" v-if="index!==visitedViews.length-1"></span> </router-link> </scroll-pane> <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu"> <li @click="refreshSelectedTag(selectedTag)">刷新</li> <li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)">关闭当前标签</li> <li @click="closeOthersTags">关闭其他标签</li> <li @click="closeAllTags(selectedTag)">关闭所有</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 组件】tab组件 */ 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) { $scrollWrapper.scrollLeft = beforePrevTagOffsetLeft; } } } } </script> <template> <el-scrollbar ref="scrollContainer" :vertical="false" class="scroll-container" @wheel.native.prevent="handleScroll"> <slot /> </el-scrollbar> </template> <style lang="less" scoped> .scroll-container { white-space: nowrap; position: relative; overflow: hidden; width: 100%; .el-scrollbar__bar { bottom: 0px; } .el-scrollbar__wrap { height: 49px; } } </style>
index.ts
import TheTagsView from './TheTagsView.vue'; export default TheTagsView;
这样我们的组件就写完啦,有哪里有问题的小伙伴可以留言哦。
组件调用
因为是全局的,所以放在全局下直接调用就好了
总结
这样我们一个简单的能实现alive 页面的tag功能就实现了。大家赶紧尝试一下吧~
兄台,请留步。这里有几点要注意一下哦~
问题1: 开发环境缓存住了,线上环境不好用了
我们是根据组件name值是否是include里包含的来判断的。但是你会发现生产的的时候 class后面的名在线上被打包后变了。 什么?!这岂不是缓存不住了???是的。 所以解决办法如图。一般人我不告诉他0.o
问题2: tags的显示名字我在哪定义呢
tags显示的名字我怎么定义呢,好问题。小兄弟肯定没有仔细读代码
ADD_VISITED_VIEW: (state: TagsState, view: Route) => { if (state.visitedViews.some((v: any) => v.path === view.path)) { return; } state.visitedViews.push( Object.assign({}, view, { title: view.meta.title || 'no-name', /// 我在这里!!!!! }), ); },
由上图我们可知,我是在路由的配置里mate标签里的tile里配置的。至于你,随你哦~
{ path: 'index', // 入口 name: 'common-home-index-index', component: () => import(/* webpackChunkName: "auth" */ '@/views/home/index.vue'), meta: { title: '首页', // 看见了么,我就是你要显示的名字 name: 'CommonHome', // 记住,我要跟你的上面name页面组件名字一样 }, }
问题3:我有的页面,跳路由后想刷新了怎么办
那我们页面缓存住了,我怎么让页面刷新呢,比如我新增页面,新增完了需要关闭当前页面跳回列表页面的,我们的思路就是,关闭标签,url参数添加refresh参数
this.$store .dispatch('tagsView/delView', this.$route) .then(({ visitedViews }) => { EventBus.$emit('gotoOwnerDeliveryOrderIndex', { refresh: true, }); });
然后在activated钩子里判断下是否有这个参数,
this.$route.query.refresh && this.fetchData();
记得处理完结果后吧refresh删了,不然每次进来都刷新了,我们是在拉去数据的混合里删的
if ( this.$route.query.refresh ) { this.$route.query.refresh = ''; }
问题4:有没有彩蛋啊
有的,请看图。 我的哥乖乖,怎么实现的呢。这个留给你们研究吧。上面代码已经实现了。只不过你需要在加一个页面,跟路由。其实就是跳转到一个新空页面路由。重新跳回来一下~
redirect/index.vue
<script lang="ts"> import { Component, Vue, Prop, Watch, Mixins } from 'vue-property-decorator'; @Component export default class Redirect extends Vue { public created() { const { params, query } = this.$route; const { path } = params; // debugger; this.$router.replace({ path: '/' + path, query }); } } </script> <template> </template>
/** * 刷新跳转路由 */ 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', }, }, ], };
参考
https://github.com/PanJiaChen/vue-element-admin
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