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admin/src/layout/components/Sidebar/SidebarItem.vue

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+<template>
+  <div v-if="!item.hidden">
+    <template v-if="hasOneShowingChild(item.child,item) && (!onlyOneChild.child||onlyOneChild.noShowingChildren)&&!item.alwaysShow">
+      <app-link v-if="onlyOneChild" :to="resolvePath(onlyOneChild.url)">
+        <el-menu-item :index="resolvePath(onlyOneChild.url)" :class="{'submenu-title-noDropdown':!isNest}">
+          <item :icon="onlyOneChild.extra||(item.meta&&item.extra)" :title="onlyOneChild.name" />
+        </el-menu-item>
+      </app-link>
+    </template>
+    <el-submenu v-else ref="subMenu" :index="resolvePath(item.url)" popper-append-to-body>
+      <template slot="title">
+        <item v-if="item" :icon="item && item.extra" :title="item.name" />
+      </template>
+      <sidebar-item
+        v-for="childs in item.child"
+        :key="childs.url"
+        :is-nest="true"
+        :item="childs"
+        :base-path="resolvePath(childs.url)"
+        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 object
+    item: {
+      type: Object,
+      required: true
+    },
+    isNest: {
+      type: Boolean,
+      default: false
+    },
+    basePath: {
+      type: String,
+      default: ''
+    }
+  },
+  data() {
+    // To fix https://github.com/PanJiaChen/vue-admin-template/issues/237
+    // TODO: refactor with render function
+    this.onlyOneChild = null
+    return {}
+  },
+  methods: {
+    hasOneShowingChild(child = [], parent) {
+      const showingChildren = child.filter(item => {
+        if (item.hidden) {
+          return false
+        } else {
+          // Temp set(will be used if only has one showing child)
+          this.onlyOneChild = item
+          return true
+        }
+      })
+
+      // When there is only one child router, the child router is displayed by default
+      if (showingChildren.length === 1) {
+        return true
+      }
+
+      // Show parent if there are no child router to display
+      if (showingChildren.length === 0) {
+        this.onlyOneChild = { ... parent, path: '', noShowingChildren: true }
+        return true
+      }
+
+      return false
+    },
+    resolvePath(routePath) {
+      if (isExternal(routePath)) {
+        return routePath
+      }
+      if (isExternal(this.basePath)) {
+        return this.basePath
+      }
+      return path.resolve(this.basePath, routePath)
+    }
+  }
+}
+</script>