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实用的 vue tags 创建缓存导航的过程实现

Leo_哒哒   2020-12-03 我要评论

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)?'active':''"
  :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
  tag="span"
  class="tags-view-item"
  @click.middle.native="!isAffix(tag)?closeSelectedTag(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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