Detailed explanation of the tree menu implementation process in Vue documentation

Vue is a popular JavaScript framework that provides many useful tools and components to help developers build efficient and easy-to-maintain web applications. One of them is the tree menu component. This article will introduce the tree menu implementation process in Vue documents and provide detailed code examples.

Creating a tree menu in Vue is very easy, just follow the following steps:

1. Define a basic template for the tree menu:

We can use Vue's template syntax to define a basic tree menu frame, as shown below:

<template>
  <div class="tree">
    <ul>
      <li v-for="node in treeData">
        {{ node.label }}
        <ul v-if="node.children">
          <li v-for="childNode in node.children">
            {{ childNode.label }}
          </li>
        </ul>
      </li>
    </ul>
  </div>
</template>

In the above template code, we created a single div# The tree menu component of the ## element. We also used the v-for directive to iterate through the data and generate nested li elements and ul elements to display the tree structure. The label text of the current node will be rendered inside the li element.

Define the data attributes of the component:

In Vue, the data of the component can be stored in the

data attribute. We need to define a treeData property in our component, which is a data format that contains the tree menu.

<script>
  export default {
    name: "TreeMenu",
    data() {
      return {
        treeData: [
          {
            id: 1,
            label: "Fruits",
            children: [
              { id: 2, label: "Apple" },
              { id: 3, label: "Banana" },
              { id: 4, label: "Orange" }
            ]
          },
          {
            id: 5,
            label: "Vegetables",
            children: [
              { id: 6, label: "Carrot" },
              { id: 7, label: "Potato" },
              { id: 8, label: "Onion" }
            ]
          }
        ]
      };
    }
  };
</script>

The above code defines a simple tree menu data. Each node contains

id, label and children attributes. The children property saves another array of nodes, which can be used to build the entire tree menu.

Interaction logic in the tree menu:

Vue provides a variety of methods to introduce and process interaction logic. Here, we use the

methods attribute to define a simple function to handle the node click event to control the expansion and contraction of the node.

<script>
  export default {
    name: "TreeMenu",
    data() {
      return {
        treeData: [
          {
            id: 1,
            label: "Fruits",
            expanded: false,
            children: [
              { id: 2, label: "Apple" },
              { id: 3, label: "Banana" },
              { id: 4, label: "Orange" }
            ]
          },
          {
            id: 5,
            label: "Vegetables",
            expanded: false,
            children: [
              { id: 6, label: "Carrot" },
              { id: 7, label: "Potato" },
              { id: 8, label: "Onion" }
            ]
          }
        ]
      };
    },
    methods: {
      toggleNode(node) {
        node.expanded = !node.expanded;
      }
    }
  };
</script>

In the above code, we added an

expanded attribute to control the expanded and collapsed state of the node. When you click on a node in the tree, the toggleNode() function will be triggered, thereby switching the expanded and collapsed states of the node.

Bind the click event in the view

Bind the previously defined

toggleNode() function to the click event of the node

<template>
  <div class="tree">
    <ul>
      <li v-for="node in treeData" :key="node.id">
        <span @click="toggleNode(node)">
          {{ node.label }}
        </span>
        <ul v-if="node.children && node.expanded">
          <li v-for="childNode in node.children" :key="childNode.id">
            <span @click="toggleNode(childNode)">
              {{ childNode.label }}
            </span>
          </li>
        </ul>
      </li>
    </ul>
  </div>
</template>

The above code adds a

span element bound to the click event, and calls the toggleNode() method to control the expansion and closing of the node.

Finally, we have completed the implementation of a basic Vue tree menu. In the above code example, we only used a few basic Vue components and APIs. However, we can customize the tree menu according to our needs, such as using CSS to adjust the style, or adding more fields and methods in the data layer to display more node information and events.

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