$(function(){
var url = "https://js.devexpress.com/Demos/Mvc/api/TreeListTasks";
$("#tree-list").dxTreeList({
dataSource: DevExpress.data.AspNet.createStore({
key: "Task_ID",
loadUrl: url + "/Tasks",
insertUrl: url + "/InsertTask",
updateUrl: url + "/UpdateTask",
deleteUrl: url + "/DeleteTask",
onBeforeSend: function(method, ajaxOptions) {
ajaxOptions.xhrFields = { withCredentials: true };
}
}),
remoteOperations: {
filtering: true,
sorting: true,
grouping: true
},
parentIdExpr: "Task_Parent_ID",
hasItemsExpr: "Has_Items",
expandedRowKeys: [1, 2],
searchPanel: {
visible: true
},
headerFilter: {
visible: true
},
editing: {
mode: "row",
allowAdding: true,
allowUpdating: true,
allowDeleting: true
},
showRowLines: true,
showBorders: true,
columnAutoWidth: true,
wordWrapEnabled: true,
columns: [{
dataField: "Task_Subject",
minWidth: 250,
validationRules: [{ type: "required" }]
}, {
dataField: "Task_Assigned_Employee_ID",
caption: "Assigned",
minWidth: 120,
lookup: {
dataSource: DevExpress.data.AspNet.createStore({
key: "ID",
loadUrl: url + "/TaskEmployees"
}),
valueExpr: "ID",
displayExpr: "Name"
},
validationRules: [{ type: "required" }]
}, {
dataField: "Task_Status",
caption: "Status",
minWidth: 120,
lookup: {
dataSource: [
"Not Started",
"Need Assistance",
"In Progress",
"Deferred",
"Completed"
]
}
}, {
dataField: "Task_Start_Date",
caption: "Start Date",
dataType: "date"
}, {
dataField: "Task_Due_Date",
caption: "Due Date",
dataType: "date"
}
],
onInitNewRow: function(e) {
e.data.Task_Status = "Not Started";
e.data.Task_Start_Date = new Date();
e.data.Task_Due_Date = new Date();
}
});
});
<!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/3.4.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<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://cdn3.devexpress.com/jslib/19.2.4/js/dx.all.js"></script>
<script src="https://unpkg.com/devextreme-aspnet-data@2.5.1/js/dx.aspnet.data.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="tree-list"></div>
</div>
</body>
</html>
#tree-list {
max-height: 640px;
}