How to implement dynamic display and selection of multi-level menus in Vue projects

How to realize the dynamic display and selection of multi-level menus in Vue projects

In Vue projects, it is a common method to realize the dynamic display and selection functions of multi-level menus need. With the following steps, we can accomplish this functionality, illustrated with concrete code examples.

Step 1: Create menu data
First, we need to create a menu data, which contains the menu's hierarchical structure, name and corresponding routing information. You can use an array to represent menu data. Each menu item is represented by an object. The object contains the name of the menu (name), routing information (path) and submenus (items). The following is a sample menu data:

menuData: [
  {
    name: '首页',
    path: '/home',
    items: []
  },
  {
    name: '关于我们',
    path: '/about',
    items: []
  },
  {
    name: '产品',
    path: '/products',
    items: [
      {
        name: '产品1',
        path: '/products/product1',
        items: []
      },
      {
        name: '产品2',
        path: '/products/product2',
        items: []
      }
    ]
  }
]

Step 2: Create a menu component
Next, we can create a menu component (Menu), which is used to display menu data. In the component's template, we can use the v-for directive to traverse the menu data and perform nested display according to the menu's hierarchical structure. In order to achieve the effect of selecting the menu, we can use the router-link component and determine whether the menu item is selected based on the routing information of the current page. The following is an example menu component:

<template>
  <ul>
    <li v-for="menu in menuData" :key="menu.path">
      <router-link :to="menu.path" :class="{ active: isActive(menu) }">{{ menu.name }}</router-link>
      <menu v-if="menu.items.length" :menu-data="menu.items"></menu>
    </li>
  </ul>
</template>

<script>
export default {
  props: {
    menuData: {
      type: Array,
      required: true
    }
  },
  methods: {
    isActive(menu) {
      return this.$route.path === menu.path
    }
  }
}
</script>

<style scoped>
.active {
  font-weight: bold;
}
</style>

Step 3: Use the menu component in the routing configuration
In the routing configuration file, we need to introduce the menu component and place it in routes Use this component as the layout in the array. In this way, the menu can be displayed dynamically in the layout of each page. The following is an example routing configuration:

import Vue from 'vue'
import Router from 'vue-router'
import Menu from '@/components/Menu'

Vue.use(Router)

const routes = [
  {
    path: '/',
    name: 'Home',
    component: Menu,
    children: [
      {
        path: 'home',
        component: () => import('@/views/Home')
      },
      {
        path: 'about',
        component: () => import('@/views/About')
      },
      {
        path: 'products',
        component: () => import('@/views/Products'),
        children: [
          {
            path: 'product1',
            component: () => import('@/views/Product1')
          },
          {
            path: 'product2',
            component: () => import('@/views/Product2')
          }
        ]
      }
    ]
  }
]

const router = new Router({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

export default router

Through the above three steps, we can implement the dynamic display and selection function of multi-level menus in the Vue project. In the menu component, use v-for to traverse the menu data, use the router-link component to perform routing jumps, and determine whether the menu item is selected through the routing information of the current page. And control the effect of the selected menu through style.

I hope the above content is helpful to you. If you have any questions, please feel free to ask me.

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