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  问题描述

VUE菜单有一个BUG，当我们点击其它按钮或者首页的时候，已经展示的一级菜单是不会自动收缩的。这个问题也导致很多开发者把一级菜单都换成了二级菜单。

错误展示

错误的效果请看下图。

 解决方法

1、寻找菜单文件

因为我使用的是ruoyi的前端框架，所以菜单文件的路径是src/layout/components/Sidebar/index.vue文件，如果大家使用的是其他的框架或者自己写的去全局搜索关键字【el-menu】就能找到菜单页面。文件路径如下图

2、添加以下代码

// el-menu菜单中添加ref和open事件
<el-menu ref="menu"  @open="handleOpen"></el-menu>
data() {return {// 记录用户上次点击的菜单索引keyIndex:0,};},watch: {$route () {// 监控用户点击的菜单，如果是首页或者个人详情页面都要把上次打开的页面收缩起来。if (this.$route.path === '/index' ||this.$route.path ===  "/user/profile") {this.$refs.menu.close(this.keyIndex);}}},methods: {handleOpen (key) {this.keyIndex = key;}},

 3、完整的代码

<template><div :class="{'has-logo':showLogo}" :style="{ backgroundColor: settings.sideTheme === 'theme-dark' ? variables.menuBackground : variables.menuLightBackground }"><logo v-if="showLogo" :collapse="isCollapse" /><el-scrollbar :class="settings.sideTheme" wrap-class="scrollbar-wrapper"><el-menuref="menu"@open="handleOpen":default-active="activeMenu":collapse="isCollapse":background-color="settings.sideTheme === 'theme-dark' ? variables.menuBackground : variables.menuLightBackground":text-color="settings.sideTheme === 'theme-dark' ? variables.menuColor : variables.menuLightColor":unique-opened="true":active-text-color="settings.theme":collapse-transition="false"mode="vertical"><sidebar-itemv-for="(route, index) in sidebarRouters":key="route.path  + index":item="route":base-path="route.path"/></el-menu></el-scrollbar></div>
</template><script>
import { mapGetters, mapState } from "vuex";
import Logo from "./Logo";
import SidebarItem from "./SidebarItem";
import variables from "@/assets/styles/variables.scss";export default {components: { SidebarItem, Logo },data() {return {keyIndex:0,};},watch: {$route () {if (this.$route.path === '/index' ||this.$route.path ===  "/user/profile") {this.$refs.menu.close(this.keyIndex);}}},methods: {handleOpen (key) {this.keyIndex = key;}},computed: {...mapState(["settings"]),...mapGetters(["sidebarRouters", "sidebar"]),activeMenu() {const route = this.$route;const { meta, path } = route;// if set path, the sidebar will highlight the path you setif (meta.activeMenu) {return meta.activeMenu;}return path;},showLogo() {return this.$store.state.settings.sidebarLogo;},variables() {return variables;},isCollapse() {return !this.sidebar.opened;}}
};
</script>

4、修改后的效果

5、到此功能完成

-----华丽的分割线，以下是凑字数，大家不用花时间看，快去改代码-----

-----华丽的分割线，以下是凑字数，大家不用花时间看，快去改代码-----

-----华丽的分割线，以下是凑字数，大家不用花时间看，快去改代码-----

<template><div v-if="!item.hidden"><template v-if="hasOneShowingChild(item.children,item) && (!onlyOneChild.children||onlyOneChild.noShowingChildren)&&!item.alwaysShow"><app-link v-if="onlyOneChild.meta" :to="resolvePath(onlyOneChild.path, onlyOneChild.query)"><el-menu-item :index="resolvePath(onlyOneChild.path)" :class="{'submenu-title-noDropdown':!isNest}"><item :icon="onlyOneChild.meta.icon||(item.meta&&item.meta.icon)" :title="$t(onlyOneChild.meta.title)" /></el-menu-item></app-link></template><el-submenu v-else ref="subMenu" :index="resolvePath(item.path)" popper-append-to-body><template slot="title"><item v-if="item.meta" :icon="item.meta && item.meta.icon" :title="item.meta.title" /></template><sidebar-itemv-for="child in item.children":key="child.path":is-nest="true":item="child":base-path="resolvePath(child.path)"class="nest-menu"/></el-submenu></div>
</template><script>
import path from 'path'
import { isExternal } from '@/utils/validate'
import Item from './Item'
import AppLink from './Link'
import FixiOSBug from './FixiOSBug'export default {name: 'SidebarItem',components: { Item, AppLink },mixins: [FixiOSBug],props: {// route objectitem: {type: Object,required: true},isNest: {type: Boolean,default: false},basePath: {type: String,default: ''}},data() {this.onlyOneChild = nullreturn {}},methods: {hasOneShowingChild(children = [], parent) {if (!children) {children = [];}const showingChildren = children.filter(item => {if (item.hidden) {return false} else {// Temp set(will be used if only has one showing child)this.onlyOneChild = itemreturn true}})// When there is only one child router, the child router is displayed by defaultif (showingChildren.length === 1) {return true}// Show parent if there are no child router to displayif (showingChildren.length === 0) {this.onlyOneChild = { ... parent, path: '', noShowingChildren: true }return true}return false},resolvePath(routePath, routeQuery) {if (isExternal(routePath)) {return routePath}if (isExternal(this.basePath)) {return this.basePath}if (routeQuery) {let query = JSON.parse(routeQuery);return { path: path.resolve(this.basePath, routePath), query: query }}return path.resolve(this.basePath, routePath)}}
}
</script>