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    Tree List

    Load Data on Demand

    This example demonstrates how to load data on demand every time a user expands a TreeList node. For this purpose, filtering is delegated to the server, and IDs of expanded nodes are sent to the server with every request for data.

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    window.onload = function() { var viewModel = { treeListOptions: { dataSource: { load: function(options) { return $.ajax({ url: "https://js.devexpress.com/Demos/Mvc/api/treeListData", dataType: "json", data: { parentIds: options.parentIds.join(",") } }); } }, remoteOperations: { filtering: true }, keyExpr: "id", parentIdExpr: "parentId", hasItemsExpr: "hasItems", rootValue: "", showBorders: true, columns: [ { dataField: "name" }, { dataField: "size", width: 100, customizeText: function(e) { if(e.value !== null) { return Math.ceil(e.value / 1024) + " KB"; } } }, { dataField: "createdDate", dataType: "date", width: 150 }, { dataField: "modifiedDate", dataType: "date", width: 150 } ] } }; ko.applyBindings(viewModel, document.getElementById("treelist")); };
    <!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="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.7/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.7/css/dx.light.css" /> <script src="https://cdn3.devexpress.com/jslib/20.1.7/js/dx.all.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="treelist" data-bind="dxTreeList: treeListOptions"></div> </div> </body> </html>
    #treelist { max-height: 440px; }