Getting Started with the Vue TreeView Component in Vue 2

25 Apr 202513 minutes to read

This article provides a step-by-step guide for setting up a Vue 2 project using Vue-CLI and integrating the Syncfusion^® Vue TreeView component using the Composition API / Options API.

Prerequisites

System requirements for Syncfusion^® Vue UI components

Setting up the Vue 2 project

To generate a Vue 2 project using Vue-CLI, use the vue create command. Follow these steps to install Vue CLI and create a new project:

npm install -g @vue/cli
vue create quickstart
cd quickstart
npm run serve

yarn global add @vue/cli
vue create quickstart
cd quickstart
yarn run serve

When creating a new project, choose the option Default ([Vue 2] babel, eslint) from the menu.

Vue 2 project

Once the quickstart project is set up with default settings, proceed to add Syncfusion^® components to the project.

Adding syncfusion^® packages

Syncfusion^® packages are available at npmjs.com. To use Vue components, install the required npm package.

This article uses the Vue TreeView component as an example. Install the @syncfusion/ej2-vue-navigations package by running the following command:

npm install @syncfusion/ej2-vue-navigations --save

yarn add @syncfusion/ej2-vue-navigations

Import Syncfusion^® CSS styles

You can import themes for the Syncfusion^® Vue component in various ways, such as using CSS or SASS styles from npm packages, CDN, CRG and Theme Studio. Refer to themes topic to know more about built-in themes and different ways to refer to themes in a Vue project.

In this article, the Material theme is applied using CSS styles, which are available in installed packages. The necessary Material CSS styles for the TreeView component and its dependents were imported into the <style> section of src/App.vue file.

~/src/app.vue
<style>
    @import "../node_modules/@syncfusion/ej2-base/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
  </style>

Add Syncfusion^® Vue component

Follow the below steps to add the Vue TreeView component using Composition API or Options API:

1. First, import and register the TreeView component in the script section of the src/App.vue file. If you are using the Composition API, you should add the setup attribute to the script tag to indicate that Vue will be using the Composition API.

Composition API (~/src/App.vue)
Options API (~/src/App.vue)
<script setup>
  import { TreeViewComponent as EjsTreeview } from "@syncfusion/ej2-vue-navigations";
</script>
<script>
  import { TreeViewComponent } from "@syncfusion/ej2-vue-navigations";

  export default {
    components: {
      'ejs-treeview': TreeViewComponent
    }
  }
</script>

Binding data source

TreeView can load data either from local data sources or remote data services. This can be done using the dataSource property that is a member of the fields property. The dataSource property supports array of JavaScript objects and DataManager. Here, an array of JSON values is passed to the TreeView component.

Composition API (~/src/App.vue)
Options API (~/src/App.vue)
<template>
  <div id="app">
    <div class="control_wrapper">
        <ejs-treeview id='treeview' :fields="fields"></ejs-treeview>
    </div>
  </div>
</template>
<script setup>
  import { TreeViewComponent } from "@syncfusion/ej2-vue-navigations";
  const data =  [
    {
        nodeId: '01', nodeText: 'Music',
        nodeChild: [
            { nodeId: '01-01', nodeText: 'Gouttes.mp3' }
        ]
    },
    {
        nodeId: '02', nodeText: 'Videos', expanded: true,
        nodeChild: [
            { nodeId: '02-01', nodeText: 'Naturals.mp4' },
            { nodeId: '02-02', nodeText: 'Wild.mpeg' },
        ]
    },
    {
        nodeId: '03', nodeText: 'Documents',
        nodeChild: [
            { nodeId: '03-01', nodeText: 'Environment Pollution.docx' },
            { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx' },
            { nodeId: '03-03', nodeText: 'Global Warming.ppt' },
            { nodeId: '03-04', nodeText: 'Social Network.pdf' },
            { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf' },
        ]
    },
  ];
  const fields = { dataSource: data, id: "nodeId", text: "nodeText", child: "nodeChild" };
</script>
<template>
      <div class="control_wrapper">
        <ejs-treeview id='treeview' :fields='fields'></ejs-treeview>
      </div>
  </template>
<script>
  import { TreeViewComponent } from "@syncfusion/ej2-vue-navigations";
  var dataSource =  [
      {
          nodeId: '01', nodeText: 'Music',
          nodeChild: [
              { nodeId: '01-01', nodeText: 'Gouttes.mp3' }
          ]
      },
      {
          nodeId: '02', nodeText: 'Videos', expanded: true,
          nodeChild: [
              { nodeId: '02-01', nodeText: 'Naturals.mp4' },
              { nodeId: '02-02', nodeText: 'Wild.mpeg' },
          ]
      },
      {
          nodeId: '03', nodeText: 'Documents',
          nodeChild: [
              { nodeId: '03-01', nodeText: 'Environment Pollution.docx' },
              { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx' },
              { nodeId: '03-03', nodeText: 'Global Warming.ppt' },
              { nodeId: '03-04', nodeText: 'Social Network.pdf' },
              { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf' },
          ]
      },
  ];
  export default {
    data: function() {
      return {
      fields: { dataSource: data, id: 'nodeId', text: 'nodeText', child: 'nodeChild' },
      };
    }
  }
</script>

Here is the summarized code for the above steps in the src/App.vue file:

Composition API (~/src/App.vue)
Options API (~src/App.vue)
<template>
  <div id="app">
    <div class="control_wrapper">
      <ejs-treeview id='treeview' :fields="fields"></ejs-treeview>
    </div>
  </div>
</template>
<script setup>

import { TreeViewComponent as EjsTreeview } from "@syncfusion/ej2-vue-navigations";

var dataSource = [
  {
    nodeId: '01', nodeText: 'Music',
    nodeChild: [
      { nodeId: '01-01', nodeText: 'Gouttes.mp3' }
    ]
  },
  {
    nodeId: '02', nodeText: 'Videos', expanded: true,
    nodeChild: [
      { nodeId: '02-01', nodeText: 'Naturals.mp4' },
      { nodeId: '02-02', nodeText: 'Wild.mpeg' },
    ]
  },
  {
    nodeId: '03', nodeText: 'Documents',
    nodeChild: [
      { nodeId: '03-01', nodeText: 'Environment Pollution.docx' },
      { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx' },
      { nodeId: '03-03', nodeText: 'Global Warming.ppt' },
      { nodeId: '03-04', nodeText: 'Social Network.pdf' },
      { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf' },
    ]
  }
];

const fields = { dataSource: dataSource, id: 'nodeId', text: 'nodeText', child: 'nodeChild' };

</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";
@import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
</style>
<template>
  <div id="app">
    <div class="control_wrapper">
      <ejs-treeview id='treeview' :fields="fields"></ejs-treeview>
    </div>
  </div>
</template>

<script>

  import { TreeViewComponent } from "@syncfusion/ej2-vue-navigations";

  var dataSource = [
    {
      nodeId: '01', nodeText: 'Music',
      nodeChild: [
        { nodeId: '01-01', nodeText: 'Gouttes.mp3' }
      ]
    },
    {
      nodeId: '02', nodeText: 'Videos', expanded: true,
      nodeChild: [
        { nodeId: '02-01', nodeText: 'Naturals.mp4' },
        { nodeId: '02-02', nodeText: 'Wild.mpeg' },
      ]
    },
    {
      nodeId: '03', nodeText: 'Documents',
      nodeChild: [
        { nodeId: '03-01', nodeText: 'Environment Pollution.docx' },
        { nodeId: '03-02', nodeText: 'Global Water, Sanitation, & Hygiene.docx' },
        { nodeId: '03-03', nodeText: 'Global Warming.ppt' },
        { nodeId: '03-04', nodeText: 'Social Network.pdf' },
        { nodeId: '03-05', nodeText: 'Youth Empowerment.pdf' },
      ]
    }
  ];

  export default {
    name: "App",
    components: {
      'ejs-treeview': TreeViewComponent
    },
    data: function () {
      return {
        fields: { dataSource: dataSource, id: 'nodeId', text: 'nodeText', child: 'nodeChild' }
      }
    }
  }
</script>

<style>
  @import "../node_modules/@syncfusion/ej2-base/styles/material.css";
  @import "../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";
  @import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
  @import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
</style>

Run the application

To run the application, use the following command:

npm run serve

yarn run serve

You can also explore our Vue TreeView example to knows how to present and manipulate data.