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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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var DemoApp = angular.module('DemoApp', ['dx']); DemoApp.controller('DemoController', function DemoController($scope) { $scope.treeViewOptions = { dataSource: new DevExpress.data.DataSource({ store: new DevExpress.data.ODataStore({ url: "https://js.devexpress.com/Demos/WidgetsGallery/odata/HierarchicalItems" }) }), dataStructure: "plain", keyExpr: "Id", displayExpr: "Name", parentIdExpr: "CategoryId", hasItemsExpr: "IsGroup", virtualModeEnabled: true }; });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" > <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" /> <script src="js/jquery-3.1.0.min.js"></script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/16.2.5/css/dx.spa.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/16.2.5/css/dx.common.css" /> <link rel="dx-theme" data-theme="generic.light" href="https://cdn3.devexpress.com/jslib/16.2.5/css/dx.light.css" /> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.16/angular.min.js"></script> <script>window.angular || document.write(decodeURIComponent('%3Cscript src="js/angular.min.js"%3E%3C\/script%3E'))</script> <script src="https://cdn3.devexpress.com/jslib/16.2.5/js/dx.all.js"></script> <script src="data.js"></script> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container" ng-app="DemoApp" ng-controller="DemoController"> <div dx-tree-view="treeViewOptions"></div> </div> </body> </html>