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
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
ScrollPane.vue
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
/** * 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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