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Check/uncheck the checkbox on clicking the tree node text

You can check and uncheck the checkboxes of tree view by clicking the tree node using the nodeClicked event of TreeView.

razor
nodecheck.cs
@Html.EJS().TreeView("treedata").ShowCheckBox(true).NodeClicked("nodeCheck").KeyPress("nodeCheck").Fields(field=>
    field.Id("id").ParentID("pid").Text("name").HasChildren("hasChild").Expanded("expanded")
    .Selected("is_selected").HtmlAttributes("hasAttribute").DataSource(ViewBag.dataSource)).Render()

<script>
    function nodeCheck(args) {
        var checkedNode = [args.node];
        var treeObj = document.getElementById('treedata').ej2_instances[0];
        if (args.event.target.classList.contains('e-fullrow') || args.event.key == "Enter") {
            var getNodeDetails = treeObj.getNodeData(args.node);
            if (getNodeDetails.isChecked == 'true') {
                treeObj.uncheckAll(checkedNode);
            } else {
                treeObj.checkAll(checkedNode);
            }
        }
    }
</script>
public IActionResult CheckBox()
        {
            List<object> treedata = new List<object>();
            treedata.Add(new
            {
                id = 1,
                name = "Australia",
                hasChild = true,
                expanded = true
            });
            treedata.Add(new
            {
                id = 2,
                pid = 1,
                name = "New South Wales",

            });
            treedata.Add(new
            {
                id = 3,
                pid = 1,
                name = "Victoria"
            });

            treedata.Add(new
            {
                id = 4,
                pid = 1,
                name = "South Australia"
            });
            treedata.Add(new
            {
                id = 6,
                pid = 1,
                name = "Western Australia",

            });
            treedata.Add(new
            {
                id = 7,
                name = "Brazil",
                hasChild = true
            });
            treedata.Add(new
            {
                id = 8,
                pid = 7,
                name = "Paraná"
            });
            treedata.Add(new
            {
                id = 9,
                pid = 7,
                name = "Ceará"
            });
            treedata.Add(new
            {
                id = 10,
                pid = 7,
                name = "Acre"
            });
            treedata.Add(new
            {
                id = 11,
                name = "China",
                hasChild = true
            });
            treedata.Add(new
            {
                id = 12,
                pid = 11,
                name = "Guangzhou"
            });
            treedata.Add(new
            {
                id = 13,
                pid = 11,
                name = "Shanghai"
            });
            treedata.Add(new
            {
                id = 14,
                pid = 11,
                name = "Beijing"
            });
            treedata.Add(new
            {
                id = 15,
                pid = 11,
                name = "Shantou"

            });
            treedata.Add(new
            {
                id = 16,
                name = "France",
                hasChild = true

            });
            treedata.Add(new
            {
                id = 17,
                pid = 16,
                name = "Pays de la Loire"

            });
            treedata.Add(new
            {
                id = 18,
                pid = 16,
                name = "Aquitaine"

            });
            treedata.Add(new
            {
                id = 19,
                pid = 16,
                name = "Brittany"

            });
            treedata.Add(new
            {
                id = 20,
                pid = 16,
                name = "Lorraine"
            });
            treedata.Add(new
            {
                id = 21,
                name = "India",
                hasChild = true

            });
            treedata.Add(new
            {
                id = 22,
                pid = 21,
                name = "Assam"

            });
            treedata.Add(new
            {
                id = 23,
                pid = 21,
                name = "Bihar"
            });
            treedata.Add(new
            {
                id = 24,
                pid = 21,
                name = "Tamil Nadu"

            });
            ViewBag.dataSource = treedata;
            return View();
        }

Output be like the below.

TreeView Sample