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Tree View

Virtual Mode

Documentation

For working with a large amount of data, the TreeView widget provides the Virtual Mode. In this mode, the widget loads a set of child nodes once their parent node is expanded. In this demo, the TreeView is associated with a remote data source. Note that the widget shows a loading indicator, because data loading takes a long time.

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<template> <div> <dx-tree-view :data-source="dataSource" :virtual-mode-enabled="true" data-structure="plain" key-expr="Id" display-expr="Name" parent-id-expr="CategoryId" has-items-expr="IsGroup" /> </div> </template> <script> import DataSource from 'devextreme/data/data_source'; import ODataStore from 'devextreme/data/odata/store'; import DxTreeView from 'devextreme-vue/tree-view'; export default { components: { DxTreeView }, data() { return { dataSource: new DataSource({ store: new ODataStore({ url: 'https://js.devexpress.com/Demos/WidgetsGallery/odata/HierarchicalItems' }) }) }; } }; </script>
import Vue from 'vue'; import App from './App.vue'; new Vue({ el: '#app', components: { App }, template: '<App/>' });
<!DOCTYPE html> <html> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import('./index.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"/> </div> </body> </html>
System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, map: { vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@latest/index.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-vue': 'npm:devextreme-vue@19.2', jszip: 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'devexpress-gantt': 'npm:devexpress-gantt', 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, meta: { '*.vue': { loader: 'vue-loader' } }, packages: { 'devextreme-vue': { main: 'index.js' }, 'devextreme': { defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true } });