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ASPxTreeView如何通過AllowCheck屬性管理復選框的可見性

原創|其它|編輯：郝浩|2012-10-15 17:25:10.000|閱讀 884 次

概述：這個例子演示了如何使用的DevExpress ASPxTreeView的AllowCheckNodes和TreeViewNode的AllowCheck屬性管理復選框的可見性。

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這個例子演示了如何使用的DevExpress ASPxTreeView的AllowCheckNodes和TreeViewNode的AllowCheck屬性管理復選框的可見性。

開發技術：.NET

開發平臺：ASP.NET

相關產品：DevExpress ASPxperience Suite（適用版本：v2010 2.3 ~v2012 1.7）

相關控件：ASPxTreeView

VB.NET語言Default.aspx代碼如下：

<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%@ Register assembly="DevExpress.Web.v10.2, Version=10.2.1.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxTreeView" tagprefix="dx" %>
<%@ Register assembly="DevExpress.Web.ASPxEditors.v10.2, Version=10.2.1.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxEditors" tagprefix="dx" %>

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

<html xmlns="//www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
     <form id="form1" runat="server">


<dx:ASPxRadioButtonList ID="ASPxRadioButtonList1" runat="server" 
    AutoPostBack="True" ClientIDMode="AutoID" 
    onselectedindexchanged="ASPxRadioButtonList1_SelectedIndexChanged" 
    SelectedIndex="0">
    <Items>
        <dx:ListEditItem Text="Hide all check boxes" Value="HideAll" />
        <dx:ListEditItem Text="Show check boxes for leaf nodes only" Value="ShowLeaves" />
        <dx:ListEditItem Text="Show all check boxes" Value="Show" />
    </Items>
</dx:ASPxRadioButtonList>


<dx:ASPxTreeView ID="ASPxTreeView1" runat="server" ClientIDMode="AutoID">
    <Nodes>
        <dx:TreeViewNode>
            <Nodes>
                <dx:TreeViewNode>
                    <Nodes>
                        <dx:TreeViewNode>
                        </dx:TreeViewNode>
                        <dx:TreeViewNode>
                        </dx:TreeViewNode>
                    </Nodes>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
            </Nodes>
        </dx:TreeViewNode>
        <dx:TreeViewNode>
            <Nodes>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
            </Nodes>
        </dx:TreeViewNode>
    </Nodes>
</dx:ASPxTreeView>
         <br />
         <br />
         <dx:ASPxButton ID="ASPxButton1" runat="server" OnClick="ASPxButton1_Click" Text="Disable checked nodes">
         </dx:ASPxButton>
         <br />
         <dx:ASPxButton ID="ASPxButton2" runat="server" OnClick="ASPxButton2_Click" Text="Enable checked nodes">
         </dx:ASPxButton>
    </form>
</body>
</html>

VB.NET語言Default.aspx.vb代碼如下：

Imports Microsoft.VisualBasic
Imports System
Imports System.Data
Imports System.Configuration
Imports System.Collections
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Imports DevExpress.Web.ASPxTreeView
Imports DevExpress.Web.ASPxEditors

Partial Public Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        If (Not IsPostBack) Then
            ASPxTreeView1.AllowCheckNodes = Not(ASPxRadioButtonList1.SelectedIndex = 0)
            ASPxTreeView1.ExpandAll()
        End If
    End Sub

    Protected Sub ASPxRadioButtonList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
        Dim rblOptions As ASPxRadioButtonList = TryCast(sender, ASPxRadioButtonList)
        Select Case rblOptions.SelectedIndex
            Case 0
                ASPxTreeView1.AllowCheckNodes = False
            Case 1
                ASPxTreeView1.AllowCheckNodes = True
                PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, AddressOf AnonymousMethod1)
            Case 2
                ASPxTreeView1.AllowCheckNodes = True
                PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, AddressOf AnonymousMethod2)
        End Select
    End Sub
    
    Private Sub AnonymousMethod1(ByVal node As TreeViewNode)
        node.AllowCheck = node.Nodes.Count = 0
    End Sub
    
    Private Sub AnonymousMethod2(ByVal node As TreeViewNode)
        node.AllowCheck = True
    End Sub

    Protected Sub PerformActionOnNodesRecursive(ByVal nodes As TreeViewNodeCollection, ByVal action As Action(Of TreeViewNode))
        For Each node As TreeViewNode In nodes
            action(node)
            If node.Nodes.Count > 0 Then
                PerformActionOnNodesRecursive(node.Nodes, action)
            End If
        Next node
    End Sub
    Protected Sub ASPxButton1_Click(ByVal sender As Object, ByVal e As EventArgs)
        PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, AddressOf AnonymousMethod3)
    End Sub
    
    Private Sub AnonymousMethod3(ByVal node As TreeViewNode)
        node.Enabled = Not node.Checked
    End Sub
    Protected Sub ASPxButton2_Click(ByVal sender As Object, ByVal e As EventArgs)
        PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, AddressOf AnonymousMethod4)
    End Sub
    
    Private Sub AnonymousMethod4(ByVal node As TreeViewNode)
        node.Enabled = True
    End Sub
End Class

C#語言Default.aspx代碼如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register assembly="DevExpress.Web.v10.2, Version=10.2.1.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxTreeView" tagprefix="dx" %>
<%@ Register assembly="DevExpress.Web.ASPxEditors.v10.2, Version=10.2.1.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxEditors" tagprefix="dx" %>
        
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "//www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="//www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
     <form id="form1" runat="server">

<!--region #Markup-->    
<dx:ASPxRadioButtonList ID="ASPxRadioButtonList1" runat="server" 
    AutoPostBack="True" ClientIDMode="AutoID" 
    onselectedindexchanged="ASPxRadioButtonList1_SelectedIndexChanged" 
    SelectedIndex="0">
    <Items>
        <dx:ListEditItem Text="Hide all check boxes" Value="HideAll" />
        <dx:ListEditItem Text="Show check boxes for leaf nodes only" Value="ShowLeaves" />
        <dx:ListEditItem Text="Show all check boxes" Value="Show" />
    </Items>
</dx:ASPxRadioButtonList>
    

<dx:ASPxTreeView ID="ASPxTreeView1" runat="server" ClientIDMode="AutoID">
    <Nodes>
        <dx:TreeViewNode>
            <Nodes>
                <dx:TreeViewNode>
                    <Nodes>
                        <dx:TreeViewNode>
                        </dx:TreeViewNode>
                        <dx:TreeViewNode>
                        </dx:TreeViewNode>
                    </Nodes>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
            </Nodes>
        </dx:TreeViewNode>
        <dx:TreeViewNode>
            <Nodes>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
                <dx:TreeViewNode>
                </dx:TreeViewNode>
            </Nodes>
        </dx:TreeViewNode>
    </Nodes>
</dx:ASPxTreeView>
         <br />
         <br />
         <dx:ASPxButton ID="ASPxButton1" runat="server" OnClick="ASPxButton1_Click" Text="Disable checked nodes">
         </dx:ASPxButton>
         <br />
         <dx:ASPxButton ID="ASPxButton2" runat="server" OnClick="ASPxButton2_Click" Text="Enable checked nodes">
         </dx:ASPxButton>
<!--endregion #Markup-->
    </form>
</body>
</html>

C#語言Default.aspx.cs代碼如下：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
#region #Check_Boxes
using DevExpress.Web.ASPxTreeView;
using DevExpress.Web.ASPxEditors;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e) {
        if (!IsPostBack) {
            ASPxTreeView1.AllowCheckNodes = !(ASPxRadioButtonList1.SelectedIndex == 0);
            ASPxTreeView1.ExpandAll();
        }
    }
    
    protected void ASPxRadioButtonList1_SelectedIndexChanged(object sender, EventArgs e) {
        ASPxRadioButtonList rblOptions = sender as ASPxRadioButtonList;
        switch (rblOptions.SelectedIndex) {
            case 0:
                ASPxTreeView1.AllowCheckNodes = false;
                break;
            case 1:
                ASPxTreeView1.AllowCheckNodes = true;
                PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, delegate(TreeViewNode node) { node.AllowCheck = node.Nodes.Count == 0; });
                break;
            case 2:
                ASPxTreeView1.AllowCheckNodes = true;
                PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, delegate(TreeViewNode node) { node.AllowCheck = true; });
                break;
        }
    }

    protected void PerformActionOnNodesRecursive(TreeViewNodeCollection nodes, Action<TreeViewNode> action) {
        foreach (TreeViewNode node in nodes) {
            action(node);
            if (node.Nodes.Count > 0)
                PerformActionOnNodesRecursive(node.Nodes, action);
        }
    }
    protected void ASPxButton1_Click(object sender, EventArgs e) {
        PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, delegate(TreeViewNode node) { node.Enabled = !node.Checked;});
    }
    protected void ASPxButton2_Click(object sender, EventArgs e) {
        PerformActionOnNodesRecursive(ASPxTreeView1.Nodes, delegate(TreeViewNode node) { node.Enabled = true; });
    }
}
#endregion #Check_Boxes

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