ASPxClientTreeListEndDragNodeEventArgs.targetElement Property

Gets the target element.

Declaration

targetElement: any

Property Value

Type	Description
any	An object that represents the target element to which the dragged node has been dropped.

Example

This example demonstrates how to implement node dragging outside the ASPxTreeList. The ASPxClientTreeList.StartDragNode client event is handled to add the cart image to the list of target elements, so that an end-user can drag nodes to the cart. If a node has been dropped to the cart, the cart image changes (in the ASPxClientTreeList.EndDragNode client event handler) and the node is painted red (using the server ASPxTreeList.HtmlRowPrepared event).

The image below shows the result:

ASPX

<dx:ASPxImage id="ASPxImage1" runat="server" ImageUrl="~/Images/cart-empty.png" ClientInstanceName="imageCart" >
</dx:ASPxImage>

<dx:ASPxTreeList ID="ASPxTreeList1" runat="server" AutoGenerateColumns="False" ClientInstanceName="treeList"
    DataSourceID="AccessDataSource1" KeyFieldName="ProductID" ParentFieldName="ParentID" 
    OnCustomCallback="ASPxTreeList1_CustomCallback" OnHtmlRowPrepared="ASPxTreeList1_HtmlRowPrepared">
    <Columns>
        <dx:TreeListTextColumn FieldName="ProductName" VisibleIndex="1">
        </dx:TreeListTextColumn>
        <dx:TreeListTextColumn FieldName="UnitPrice" VisibleIndex="2">
            <PropertiesTextEdit DisplayFormatString="c2">
            </PropertiesTextEdit>
        </dx:TreeListTextColumn>
    </Columns>
        <SettingsEditing AllowNodeDragDrop="True" />
    <ClientSideEvents 
        EndDragNode="function(s, e) {
            if(e.targetElement == imageCart.GetMainElement()) {
                imageCart.SetImageUrl('Images/cart-filled.png');
                e.cancel = true;
                s.PerformCustomCallback(e.nodeKey);
            }
        }" 
        StartDragNode="function(s, e) {
            if(s.GetNodeState(e.nodeKey) == 'Child')
                e.targets.push(imageCart.GetMainElement());
        }" />
</dx:ASPxTreeList>

C#

using System.Collections;
using DevExpress.Web.ASPxEditors;
using DevExpress.Web.ASPxTreeList;

protected void Page_Load(object sender, EventArgs e){
    if (!IsPostBack && !IsCallback)
        Session["ItemsInCart"] = new ArrayList();
}

protected void ASPxTreeList1_CustomCallback(object sender, DevExpress.Web.ASPxTreeList.TreeListCustomCallbackEventArgs e){
    (Session["ItemsInCart"] as ArrayList).Add(e.Argument);
}

protected void ASPxTreeList1_HtmlRowPrepared(object sender, DevExpress.Web.ASPxTreeList.TreeListHtmlRowEventArgs e){
    ArrayList orders = Session["ItemsInCart"] as ArrayList;
    if (orders.Count == 0) return;
    if (orders.Contains(e.NodeKey))
        e.Row.ForeColor = System.Drawing.Color.OrangeRed;
}

VB.NET

Imports System.Collections
Imports DevExpress.Web.ASPxEditors
Imports DevExpress.Web.ASPxTreeList

Protected Sub Page_Load(sender As Object, e As EventArgs)
    If Not IsPostBack AndAlso Not IsCallback Then
        Session("ItemsInCart") = New ArrayList()
    End If
End Sub

Protected Sub ASPxTreeList1_CustomCallback(sender As Object, e As DevExpress.Web.ASPxTreeList.TreeListCustomCallbackEventArgs)
    TryCast(Session("ItemsInCart"), ArrayList).Add(e.Argument)
End Sub

Protected Sub ASPxTreeList1_HtmlRowPrepared(sender As Object, e As DevExpress.Web.ASPxTreeList.TreeListHtmlRowEventArgs)
    Dim orders As ArrayList = TryCast(Session("ItemsInCart"), ArrayList)
    If orders.Count = 0 Then
        Return
    End If
    If orders.Contains(e.NodeKey) Then
        e.Row.ForeColor = System.Drawing.Color.OrangeRed
    End If
End Sub