[CLOSED] TreeViewDragDrop plugin on over event

  1. #1

    [CLOSED] TreeViewDragDrop plugin on over event


    I am trying to use a TreeViewDragDrop plugin for nodes reordering. I have nodes of different types, and nodes of one type could not be dropped to nodes of other type. I was abble to implement this using BeforeDrop listener (I return false, when types are different). However I did not find any way to show user, that this drop operation is not allowed (no Over listener).

    Could you suggest a way to solve this issue?

    Best regards.
    Last edited by Daniil; Sep 12, 2012 at 2:47 PM. Reason: [CLOSED]
  2. #2
    Hi Leonid,

    Unfortunately, there is no built-in option to change this behavior.

    But I can suggest to override the isValidDropPoint function of the ViewDropZone class.

    <%@ Page Language="C#" %>
    <%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
    <!DOCTYPE html>
    <head runat="server">
        <title>Ext.NET v2 Example</title>
        <script type="text/javascript">
            var onAfterRender = function (view) {
                var dz = view.getPlugin("dragdrop").dropZone;
                dz.isValidDropPoint = Ext.Function.createInterceptor(dz.isValidDropPoint, function (node, position, dragZone, e, data) {
                    return false; // please implement as you need  
        <ext:ResourceManager runat="server" />
        <ext:TreePanel runat="server">
                <ext:Node Text="Root (level 0)" Expanded="true">
                        <ext:Node Text="Node1 (level 1)" Expanded="true">
                                <ext:Node Text="Node1 (level 2)" Expanded="true">
                                        <ext:Node Text="Node1 (level 3)" Leaf="true" />
                                        <ext:Node Text="Node2 (level 3)" Leaf="true" />
                <ext:TreeView runat="server">
                        <ext:TreeViewDragDrop PluginId="dragdrop" runat="server" />
                        <AfterRender Fn="onAfterRender" />
  3. #3
    Thank you, Daniil. This works perfect.
  4. #4
    You may be interested to look at this example.

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