How to use Vue and Element-UI to display tree-structured data

How to use Vue and Element-UI to implement tree-structured data display

Introduction:
In modern web applications, tree-structured data display is a very common requirement. As a very popular front-end framework, Vue.js, combined with Element-UI, a powerful UI library, can easily realize tree-structured data display. This article will introduce how to use Vue and Element-UI to implement this function, and provide code examples for readers' reference.

1. Preliminary knowledge:
Before we start using Vue and Element-UI to implement tree-structured data display, we need to understand some relevant basic knowledge.

1. Vue.js:
   Vue.js is a progressive JavaScript framework for building user interfaces. Its core idea is to build applications through componentization. Vue.js provides a simple and flexible API that allows us to easily carry out data-driven development. If you are not familiar with Vue.js, it is recommended to read the official documentation of Vue.js first.
2. Element-UI:
   Element-UI is a set of UI component libraries based on Vue.js. It provides a series of high-quality components that can quickly build beautiful and practical web interfaces. The official documentation of Element-UI provides detailed component descriptions and usage examples, where we can find the required components and understand how to use them.
3. Data representation of tree structure:
   Tree structure is a common data representation method. It consists of nodes and edges, and the nodes are connected by edges. In a tree structure, there is generally a root node, and there can be any number of child nodes below the root node. Child nodes can in turn have child nodes of their own, and so on. In practical applications, we usually represent tree-structured data as a JavaScript object, which contains node information and the hierarchical relationship between them.

2. Implementation steps:
Now we can start using Vue and Element-UI to implement tree structure data display. The following are the implementation steps:

1. Create a Vue instance and introduce the Element-UI library:

   import Vue from 'vue';
   import ElementUI from 'element-ui';
   import 'element-ui/lib/theme-chalk/index.css';
   
   Vue.use(ElementUI);

2. Define a tree component in the Vue instance:

   <template>
     <el-tree
    :data="treeData"
    :props="treeProps"
    @node-click="handleNodeClick"
     />
   </template>
   
   <script>
   export default {
     data() {
    return {
      treeData: [
        {
          label: '节点一',
          children: [
            {
              label: '子节点一'
            },
            {
              label: '子节点二'
            }
          ]
        },
        {
          label: '节点二',
          children: [
            {
              label: '子节点三'
            },
            {
              label: '子节点四'
            }
          ]
        }
      ],
      treeProps: {
        label: 'label',
        children: 'children'
      }
    };
     },
     methods: {
    handleNodeClick(data) {
      console.log(data);
    }
     }
   };
   </script>

3. Mount the tree component in the Vue instance:

   new Vue({
     el: '#app',
     components: {
    TreeComponent
     },
     template: '<TreeComponent />'
   });

3. Code analysis:
In the above code example, we define a Vue component named TreeComponent . In the data option of the component, we represent the tree structure data through an array treeData. Each element in the array represents a node, including the label attribute of the node and the children attribute of the child node. By setting the treeProps attribute, we tell the Element-UI component to use label as the display text of the node and children as the attribute name of the child node.

The handleNodeClick method in the component is an event handling function, which is triggered when a node in the tree is clicked. In this method, we can obtain the information of the clicked node and perform corresponding operations, such as printing to the console.

Finally, mount the TreeComponent component to an element of the page in the Vue instance, such as the element with the id app.

4. Summary:
This article introduces how to use Vue and Element-UI to realize tree structure data display. Through Vue's data-driven and Element-UI's component features, we can quickly and efficiently build a tree-structured Web interface. I hope this article can help readers understand and master relevant knowledge and skills.

References:

• Vue.js official documentation: https://vuejs.org/
• Element-UI official documentation: https://element. eleme.cn/#/zh-CN

Code sample:
The complete code sample can be viewed at the following link:
[GitHub code sample](https://github. com/example/tree-component)

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