Multiple Selection

14 Aug 20184 minutes to read

TreeView supports to select the multiple nodes by specifying allowMultiSelection as true. It allows you to select more than one nodes in TreeView.

In the code behind page, create a data list which contains the details about tree nodes and map the list data to DataSource property of TreeView.

public partial class LoadOnDemand : System.Web.UI.Page
	{
		List<LoadData> tree1 = new List<LoadData>();
		protected void Page_Load(object sender, EventArgs e)
		{
			tree1.Add(new LoadData { Id = 1, Parent = 0, Text = "Item 1" });
			tree1.Add(new LoadData { Id = 2, Parent = 0, Text = "Item 2" });
			tree1.Add(new LoadData { Id = 3, Parent = 0, Text = "Item 3" });
			tree1.Add(new LoadData { Id = 4, Parent = 0, Text = "Item 4" });
			tree1.Add(new LoadData { Id = 5, Parent = 1, Text = "Item 1.1" });
			tree1.Add(new LoadData { Id = 6, Parent = 1, Text = "Item 1.2" });
			tree1.Add(new LoadData { Id = 7, Parent = 1, Text = "Item 1.3" });
			tree1.Add(new LoadData { Id = 8, Parent = 3, Text = "Item 3.1" });
			tree1.Add(new LoadData { Id = 9, Parent = 3, Text = "Item 3.2" });
			tree1.Add(new LoadData { Id = 10, Parent = 5, Text = "Item 1.1.1" });
			this.treeMultiSelect.Fields.DataSource = tree1;
		}
	} 
	
	public class LoadData
	{
		public int Id { get; set; }
		public int? Parent { get; set; }
		public string Text { get; set; }
		public bool? hasChild { get; set; }
		public bool? expanded { get; set; }
		public bool? ischecked { get; set; }
		public bool? selected { get; set; }
		public string spriteCss { get; set; }
	}

In the ASPX page, add TreeView element with following properties.

HTML

<ej:TreeView 
		ID="treeMultiSelect" 
		runat="server" 
		DataIdField="Id" 
		DataParentIdField="Parent" 
		DataTextField="Text" 
		AllowMultiSelection="true">
	</ej:TreeView>

Select Nodes

To select more than one nodes of TreeView, you can use selectedNodes property. It will select the TreeView nodes from the given indexes.

In the ASPX page, add TreeView element with following properties. We you can select the specific nodes in TreeView by using selectedNodes property.

HTML

<ej:TreeView 
		ID="treeMultiSelect" 
		runat="server" 
		DataIdField="Id" 
		DataParentIdField="Parent" 
		DataTextField="Text" 
		AllowMultiSelection="true">
	</ej:TreeView>

$(function () {
        // create instance for TreeView
        var treeObj = $("#treeMultiSelect").data("ejTreeView");

        treeObj.option("selectedNodes", [0, 5, 6]); //select the TreeView nodes from the given indexes
    });

Get Selected Nodes

To get the selected Nodes of TreeView, you can use getSelectedNodes method. It returns the collections of TreeView selected nodes. You can use getSelectedNodesIndex method to get the index positions of currently selected nodes.

In the ASPX page, add TreeView element with following properties. We you can get selected nodes from TreeView by using getSelectedNodes method.

HTML

<ej:TreeView 
		ID="treeMultiSelect" 
		runat="server" 
		DataIdField="Id" 
		DataParentIdField="Parent" 
		DataTextField="Text" 
		AllowMultiSelection="true">
	</ej:TreeView>

$(function () {
        // create instance for TreeView
        var treeObj = $("#treeMultiSelect").data("ejTreeView");

        treeObj.getSelectedNodes(); //returns the collections of TreeView selected nodes
    });