代码之家 › 专栏 › 技术社区 › Eric Belair

如何自定义两个ComponentOne TreeView组件之间的拖放?

componentone treeview drag-and-drop .net

0

Eric Belair · 技术社区 · 15 年前

我在.NET网页中有两个TreeView组件。我想将节点从一个树拖放到另一个树,但不能反过来。我还想在某个级别(最低级别)拖放项目,并将其放到某个级别(第二个最低级别)。我在Flex中编写了自定义代码来进行类似的拖放定制,但我是.NET的新手,在这里我真的没有任何线索。有人能给我一些建议吗。这是一个原型,所以我只需要基本的功能,但最终我将需要这些drop来执行对数据库的实时调用,以更新这些移动操作的数据。

1 回复 | 直到 9 年前

1

Banzor 11 年前

在JavaScript中使用 OnClientNodeDropped 事件处理程序。您也可以使用 OnClientNodeDragStarted drag and drop treeview sample 在这里。下面是项目的示例代码。

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register TagPrefix="cc1" Namespace="C1.Web.UI.Controls.C1TreeView" Assembly="C1.Web.UI.Controls.3" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Treeview Test</title>
<script type="text/javascript" id="ComponentOneClientScript2">
    function adminTV_OnClientNodeDropped(sender, eventArgs) {
        var dropTarget = eventArgs.get_desObj();
        //if drop to the root level.the droptarget is treeview
        if (dropTarget == sender) {
            eventArgs.set_canceled(true);
            return;
        }
        var node = eventArgs.get_node();
        //the other treeview's node can't drop to the admin's.
        if (node.get_treeView() != dropTarget.get_treeView()) {
            eventArgs.set_canceled(true);
            return;
        }
        //prevent drop the admin's node to the other level.
        if (dropTarget.get_level() != 0) {
            eventArgs.set_canceled(true);
            return;
        }
  };
  function adminTV_OnClientNodeDragStarted(sender, eventArgs) {
      //can't drag root node.
      if (eventArgs.get_node().get_level() == 0) {
          eventArgs.set_canceled(true);
      }
  };

  function userTV_OnClientNodeDropped(sender, eventArgs) {
      var dropTarget = eventArgs.get_desObj();
      //if drop to the root level.the droptarget is treeview
      if (dropTarget == sender) {
          eventArgs.set_canceled(true);
          return;
      }
      //prevent drop the node to the other level.
      if (dropTarget.get_level() != 0) {
          eventArgs.set_canceled(true);
          return;
      }
  };
  function userTV_OnClientNodeDragStarted(sender, eventArgs) {
      //can't drag root node.
      if (eventArgs.get_node().get_level() == 0) {
          eventArgs.set_canceled(true);
      }
  };
</script>    
</head>
<body style="font-weight: 700">
<form id="form1" runat="server">
<div>


    <asp:ScriptManager runat="server"></asp:ScriptManager>


   <cc1:C1TreeView runat="server" ID="adminTV" AllowDragDrop="true" 
   VisualStyle="ArcticFox" VisualStylePath="~/C1WebControls/VisualStyles" 
        OnClientNodeDropped="adminTV_OnClientNodeDropped" 
        onclientnodedragstarted="adminTV_OnClientNodeDragStarted" >
        <Nodes>
            <cc1:C1TreeViewNode runat="server" Expanded="true" Selected="false" Text="Administrators">
                <Nodes>
                    <cc1:C1TreeViewNode runat="server" Expanded="false" Selected="false" Text="Admin1">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="false" Selected="false" Text="Admin2">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="false" Selected="false" Text="Admin3">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="false" Selected="false" Text="Admin4">
                    </cc1:C1TreeViewNode>
                </Nodes>
            </cc1:C1TreeViewNode>
        </Nodes>
   </cc1:C1TreeView>

   <cc1:C1TreeView runat="server" ID="userTV" AllowDragDrop="true" 
   VisualStyle="ArcticFox" VisualStylePath="~/C1WebControls/VisualStyles" 
        OnClientNodeDropped="userTV_OnClientNodeDropped"
        onclientnodedragstarted="userTV_OnClientNodeDragStarted" >
        <Nodes>
            <cc1:C1TreeViewNode runat="server" Expanded="True" Selected="False" Text="Users">
                <Nodes>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User1">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User2">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User3">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User4">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User5">
                    </cc1:C1TreeViewNode>
                    <cc1:C1TreeViewNode runat="server" Expanded="False" Selected="False" Text="User6">
                    </cc1:C1TreeViewNode>
                </Nodes>
            </cc1:C1TreeViewNode>
        </Nodes>
   </cc1:C1TreeView>

</div>
</form>
</body>
</html>