How to use uniapp to develop multi-level menu functions

How to use uniapp to develop multi-level menu functions

In mobile application development, it is often necessary to use multi-level menus to achieve more complex functions and interactive experiences. As a cross-platform development framework, uniapp can help developers quickly implement multi-level menu functions. This article will introduce in detail how to use uniapp to develop multi-level menu functions, and attach code examples.

1. Create the data structure of multi-level menu

Before developing a multi-level menu, we need to define the data structure of the menu first. Usually, we can use an array to represent the hierarchical relationship of a multi-level menu. Each menu item contains a unique identifier (id), menu name (name), parent menu identifier (parentId), and submenu list (children).

The following is an example menu data structure:

const menus = [
  { id: 1, name: '菜单1', parentId: 0, children: [
    { id: 11, name: '菜单1-1', parentId: 1, children: [] },
    { id: 12, name: '菜单1-2', parentId: 1, children: [
      { id: 121, name: '菜单1-2-1', parentId: 12, children: [] },
      { id: 122, name: '菜单1-2-2', parentId: 12, children: [] },
    ] },
  ] },
  { id: 2, name: '菜单2', parentId: 0, children: [
    { id: 21, name: '菜单2-1', parentId: 2, children: [] },
    { id: 22, name: '菜单2-2', parentId: 2, children: [] },
  ] },
];

2. Rendering multi-level menu

In uniapp, we can use<template> and <ul> tags to render multi-level menus. First, we need to recursively traverse the menu data and generate the corresponding menu items.

The following is a code example for rendering a multi-level menu:

<template>
  <ul>
    <li v-for="menu in menus" :key="menu.id">
      {{ menu.name }}
      <ul v-if="menu.children.length > 0">
        <menu-item :menus="menu.children"></menu-item>
      </ul>
    </li>
  </ul>
</template>

<script>
export default {
  props: {
    menus: {
      type: Array,
      default: () => [],
    },
  },
};
</script>

In the above code, a custom component <menu-item> is used to recursively render submenus . In the v-if directive of the <ul> tag, determine whether the current menu item has a submenu, and if there is a submenu, render <menu-item>Components. Through recursive calls, infinite expansion of multi-level menus can be achieved.

3. Implement click events for multi-level menus

Usually, when we click on a menu item, we need to perform related operations, such as jumping to other pages or performing specific functions. In uniapp, we can use the @click event to listen for clicks on menu items and perform related operations.

The following is a code example to implement a multi-level menu click event:

<template>
  <ul>
    <li v-for="menu in menus" :key="menu.id" @click="handleClick(menu)">
      {{ menu.name }}
      <ul v-if="menu.children.length > 0">
        <menu-item :menus="menu.children"></menu-item>
      </ul>
    </li>
  </ul>
</template>

<script>
export default {
  props: {
    menus: {
      type: Array,
      default: () => [],
    },
  },
  methods: {
    handleClick(menu) {
      // 执行相关操作
    },
  },
};
</script>

In the above code, we monitor the click of the menu item through the @click event and trigger handleClick method. In the handleClick method, specific functional logic can be implemented, such as jumping to other pages or performing specific operations.

In summary, using uniapp to develop multi-level menu functions can be accomplished by defining the data structure of the menu, rendering the multi-level menu, and implementing click events for menu items. Through the above code examples, I hope it can help readers understand and implement the functions. Of course, the specific implementation method can also be adjusted and expanded according to application requirements.

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