How to use Vue and Element-UI to implement multi-level menu navigation function
Introduction:
As the complexity of modern web applications increases, multi-level menu navigation function has become essential part. As a popular JavaScript framework, Vue is widely used in front-end development for its simplicity, ease of use and flexibility. Element-UI is a set of UI component libraries based on Vue, which provides a rich set of components and styles and is suitable for building modern web interfaces. This article will introduce how to use Vue and Element-UI to implement multi-level menu navigation functions, and provide code examples.
HTML structure:
First, we need to create a container element in the HTML file to host the Vue application. Then, create a <el-menu>
component in the container to display menu navigation. The code example is as follows:
<div id="app"> <el-menu :default-active="activeIndex" mode="horizontal" @select="handleMenuSelect"> <el-submenu index="1"> <template slot="title">一级菜单</template> <el-menu-item index="1-1">二级菜单-1</el-menu-item> <el-menu-item index="1-2">二级菜单-2</el-menu-item> </el-submenu> <el-submenu index="2"> <template slot="title">一级菜单</template> <el-menu-item index="2-1">二级菜单-1</el-menu-item> <el-menu-item index="2-2">二级菜单-2</el-menu-item> </el-submenu> </el-menu> </div>
Vue script:
Next, we need to write a Vue script to control the behavior of menu navigation. First, we need to import Vue and Element-UI and create a Vue instance. Then, define a data
attribute in the instance to store the index of the currently selected menu item. Finally, define a method handleMenuSelect
in the instance to handle the selection event of the menu item. The code sample is as follows:
// 导入Vue和Element-UI import Vue from 'vue'; import ElementUI from 'element-ui'; import 'element-ui/lib/theme-chalk/index.css'; // 创建Vue实例 new Vue({ el: '#app', data: { activeIndex: '1-1' // 当前选中的菜单项的索引 }, methods: { handleMenuSelect(index) { console.log('选中了菜单项', index); this.activeIndex = index; // 更新当前选中的菜单项的索引 } } });
Complete sample code:
The following is a complete sample code using Vue and Element-UI to implement multi-level menu navigation function:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>多级菜单导航</title> <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css"> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> <script src="https://unpkg.com/element-ui/lib/index.js"></script> </head> <body> <div id="app"> <el-menu :default-active="activeIndex" mode="horizontal" @select="handleMenuSelect"> <el-submenu index="1"> <template slot="title">一级菜单</template> <el-menu-item index="1-1">二级菜单-1</el-menu-item> <el-menu-item index="1-2">二级菜单-2</el-menu-item> </el-submenu> <el-submenu index="2"> <template slot="title">一级菜单</template> <el-menu-item index="2-1">二级菜单-1</el-menu-item> <el-menu-item index="2-2">二级菜单-2</el-menu-item> </el-submenu> </el-menu> </div> <script> // 创建Vue实例 new Vue({ el: '#app', data: { activeIndex: '1-1' // 当前选中的菜单项的索引 }, methods: { handleMenuSelect(index) { console.log('选中了菜单项', index); this.activeIndex = index; // 更新当前选中的菜单项的索引 } } }); </script> </body> </html>
Summary:
By using Vue and Element-UI, we can easily implement multi-level menu navigation functionality. This article describes how to implement it through HTML structure and Vue scripts, and provides complete sample code. I hope this article can help you understand and apply the multi-level menu navigation function.
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