Fix vue-element-admin tag-view refresh problem

The array in the tag-view is cached in vuex. The vuEX plug-in we used to solve the problem is vuE-along. However, if you use this plug-in, you will get an error: Cannot convert a Symbol value to a string. The result is that the plugin will iterate over the data passed in, and there is a circular reference. However, tag-view uses the merge Object method object. assign. This method is a shallow copy, which will affect the original;

Solution:

• Replace the Vuex persistence plug-invuex-persistedstate

1. / SRC /store/index.js

The reduce function of Vuex-PersistedState is persistent, iterated, and the tag-view is not cached by Vuex-PersistedState, so there is no circular reference. The specific usage of Vuex-PersistedState is available in both tutorials. PS: I wrote it, too

The vuEX refresh disappears

Vuex Persistence + Modularization for Practical use (Advanced)

import Vue from "vue";
import Vuex from "vuex";
import getters from "./getters";
// import createVuexAlong from 'vuex-along'
import createPersistedState from "vuex-persistedstate";
Vue.use(Vuex);

// https://webpack.js.org/guides/dependency-management/#requirecontext
const modulesFiles = require.context("./modules".true./\.js$/);

// you do not need `import app from './modules/app'`
// it will auto require all vuex module from modules file
const modules = modulesFiles.keys().reduce((modules, modulePath) = > {
  // set './app.js' => 'app'
  const moduleName = modulePath.replace(/^\.\/(.*)\.\w+$/."$1");
  const value = modulesFiles(modulePath);
  modules[moduleName] = value.default;
  return modules;
}, {});

const store = new Vuex.Store({
  plugins: [
    createPersistedState({
      storage: window.localStorage,
      reducer(val) {
        return {
          // The data to be stored
          user: val.user,
          settings: val.settings,
          permission: val.permission,
          app: val.app,
        };
      },
    }),
  ],
  modules,
  getters,
  // plugins: [createVuexAlong()]
});

export default store;
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2. / SRC/layout/components/TagsView/index. The vue code is as follows:

2.1 Key code is the code I newly added

  mounted() {
     // Cache and assign before page refresh
    this.beforeUnload();
    this.initTags()
    this.addTags()
  },
beforeUnload() {
      // Listen for page refresh
      window.addEventListener("beforeunload".() = > {
        // The visitedViews data structure is too complex to handle directly with json.stringify
        let tabViews = this.visitedViews.map(item= > {
          return {
            fullPath: item.fullPath,
            hash: item.hash,
            meta: { ...item.meta },
            name: item.name,
            params: { ...item.params },
            path: item.path,
            query: { ...item.query },
            title: item.title
          };
        });
        sessionStorage.setItem("tabViews".JSON.stringify(tabViews));

      });
      // Initialize the page load to determine whether there is data in the cache
      let oldViews = JSON.parse(sessionStorage.getItem("tabViews")) || [];
      if (oldViews.length > 0) {
        this.$store.state.tagsView.visitedViews = oldViews; sessionStorage.clear(); }},Copy the code

2.1. All codes

<template>
  <div id="tags-view-container" class="tags-view-container">
    <scroll-pane ref="scrollPane" class="tags-view-wrapper" @scroll="handleScroll">
      <router-link
        v-for="tag 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)" />
      </router-link>
    </scroll-pane>
    <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
      <li @click="refreshSelectedTag(selectedTag)">Refresh</li>
      <li v-if=! "" isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)">Close</li>
      <li @click="closeOthersTags">Close Others</li>
      <li @click="closeAllTags(selectedTag)">Close All</li>
    </ul>
  </div>
</template>

<script>
import ScrollPane from './ScrollPane'
import path from 'path'

export default {
  components: { ScrollPane },
  data() {
    return {
      visible: false.top: 0.left: 0.selectedTag: {},
      affixTags: []}},computed: {
    visitedViews() {
      return this.$store.state.tagsView.visitedViews
    },
    routes() {
      return this.$store.state.permission.routes
    }
  },
  watch: {
    $route() {
      this.addTags()
      this.moveToCurrentTag()
    },
    visible(value) {
      if (value) {
        document.body.addEventListener('click'.this.closeMenu)
      } else {
        document.body.removeEventListener('click'.this.closeMenu)
      }
    }
  },
  mounted() {
     // Cache and assign before page refresh
    this.beforeUnload();
    this.initTags()
    this.addTags()
  },
  methods: {
    isActive(route) {
      return route.path === this.$route.path
    },
    isAffix(tag) {
      return tag.meta && tag.meta.affix
    },
    filterAffixTags(routes, basePath = '/') {
      let tags = []
      routes.forEach(route= > {
        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
    },
     beforeUnload() {
      // Listen for page refresh
      window.addEventListener("beforeunload".() = > {
        // The visitedViews data structure is too complex to handle directly with json.stringify
        let tabViews = this.visitedViews.map(item= > {
          return {
            fullPath: item.fullPath,
            hash: item.hash,
            meta: { ...item.meta },
            name: item.name,
            params: { ...item.params },
            path: item.path,
            query: { ...item.query },
            title: item.title
          };
        });
        sessionStorage.setItem("tabViews".JSON.stringify(tabViews));

      });
      // Initialize the page load to determine whether there is data in the cache
      let oldViews = JSON.parse(sessionStorage.getItem("tabViews")) || [];
      if (oldViews.length > 0) {
        this.$store.state.tagsView.visitedViews = oldViews; sessionStorage.clear(); }},initTags() {
      const affixTags = this.affixTags = this.filterAffixTags(this.routes)
      for (const tag of affixTags) {
        // Must have tag name
        if (tag.name) {
          this.$store.dispatch('tagsView/addVisitedView', tag)
        }
      }
    },
    addTags() {
      const { name } = this.$route
      if (name) {
        this.$store.dispatch('tagsView/addView'.this.$route)
      }
      return false
    },
    moveToCurrentTag() {
      const tags = this.$refs.tag
      this.$nextTick(() = > {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag)
            // when query is different then update
            if(tag.to.fullPath ! = =this.$route.fullPath) {
              this.$store.dispatch('tagsView/updateVisitedView'.this.$route)
            }
            break}}})},refreshSelectedTag(view) {
      this.$store.dispatch('tagsView/delCachedView', view).then(() = > {
        const { fullPath } = view
        this.$nextTick(() = > {
          this.$router.replace({
            path: '/redirect' + fullPath
          })
        })
      })
    },
    closeSelectedTag(view) {
      this.$store.dispatch('tagsView/delView', view).then(({ visitedViews }) = > {
        if (this.isActive(view)) {
          this.toLastView(visitedViews, view)
        }
      })
    },
    closeOthersTags() {
      this.$router.push(this.selectedTag)
      this.$store.dispatch('tagsView/delOthersViews'.this.selectedTag).then(() = > {
        this.moveToCurrentTag()
      })
    },
    closeAllTags(view) {
      this.$store.dispatch('tagsView/delAllViews').then(({ visitedViews }) = > {
        if (this.affixTags.some(tag= > tag.path === view.path)) {
          return
        }
        this.toLastView(visitedViews, view)
      })
    },
    toLastView(visitedViews, view) {
      const latestView = visitedViews.slice(-1) [0]
      if (latestView) {
        this.$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('/')}}},openMenu(tag, e) {
      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 // 15: margin right

      if (left > maxLeft) {
        this.left = maxLeft
      } else {
        this.left = left
      }

      this.top = e.clientY
      this.visible = true
      this.selectedTag = tag
    },
    closeMenu() {
      this.visible = false
    },
    handleScroll() {
      this.closeMenu()
    }
  }
}
</script>

<style lang="scss" scoped>
.tags-view-container {
  height: 34px;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0.0.0.12), 0 0 3px 0 rgba(0.0.0.04);
  .tags-view-wrapper {
    .tags-view-item {
      display: inline-block;
      position: relative;
      cursor: pointer;
      height: 26px;
      line-height: 26px;
      border: 1px solid #d8dce5;
      color: # 495060;
      background: #fff;
      padding: 0 8px;
      font-size: 12px;
      margin-left: 5px;
      margin-top: 4px;
      &:first-of-type {
        margin-left: 15px;
      }
      &:last-of-type {
        margin-right: 15px;
      }
      &.active {
        background-color: #42b983;
        color: #fff;
        border-color: #42b983;
        &::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="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
  .tags-view-item {
    .el-icon-close {
      width: 16px;
      height: 16px;
      vertical-align: 2px;
      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; }}}}</style>

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