扩展TreeView控件(1) - 联动复选框（复选框的全选和取消全选）

TreeView既强大又好用。为了让它更强大、更好用，咱们来写一个继承自TreeView的控件。
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扩展TreeView控件(1) - 联动复选框（复选框的全选和取消全选）

做者：webabcd


介绍
扩展TreeView控件：
联动复选框（复选框的全选和取消全选）。选中指定的父复选框，则设置其全部子复选框为选中状态；取消选中指定的父复选框，则设置其全部子复选框为取消选中状态。若是某父复选框的全部子复选框为均选中状态，则设置该父复选框为选中状态；若是某复选框的全部子复选框至少有一个为取消选中状态，则设置该父复选框为取消选中状态

使用方法（设置属性）：
AllowCascadeCheckbox - 是否启用联动复选框功能


关键代码
相关的js

//----------------------------
// http://webabcd.cnblogs.com/
//----------------------------

/*Helper 开始*/
String.prototype.yy_stv_startsWith = function(s)
{        
/// <summary>StartsWith()</summary>

         var reg = new RegExp( "^" + s);        
         return reg.test( this);
}

function yy_stv_addEvent(obj, evtType, fn)    
{
/// <summary>绑定事件</summary>

         // FF
         if (obj.addEventListener)
        {
                obj.addEventListener(evtType, fn, true);
                 return true;
        }
         // IE
         else if (obj.attachEvent)
        {
                 var r = obj.attachEvent( "on" + evtType, fn);
                 return r;
        }
         else
        {
                 return false;
        }        
}
/*Helper 结束*/


/*联动复选框 开始*/
var yy_stv_ccTreeView_pre = new Array(); // cs中动态向其灌数据（TreeView内控件ID的前缀数组）

function yy_stv_ccClickCheckbox(e)    
{
/// <summary>单击复选框时</summary>

         var evt = e || window.event; // FF || IE
         var obj = evt.target || evt.srcElement     // FF || IE
        
        yy_stv_foreachChildCheckbox(obj);
        yy_stv_foreachParentCheckbox(obj);
}


function yy_stv_checkParentCheckbox(table, checked)
{
/// <summary>设置父复选框的状态</summary>

         var nodes = table.parentNode.parentNode.childNodes;
                
         for ( var i=1; i<nodes.length; i++)
        {
                 if (nodes[i] == table.parentNode)
                {
                         if ( typeof(nodes[i-1]) == 'undefined' || typeof(nodes[i-1].rows) == 'undefined') return;

                         for ( var x=0; x < nodes[i-1].rows.length; x++)
                        {
                                 for ( var j=0; j < nodes[i-1].rows[x].cells.length; j++)
                                {
                                         // debugger;
                                         var chk = nodes[i-1].rows[x].cells[j].childNodes[0];
                                         if ( typeof(chk) != 'undefined' && chk.tagName == "INPUT" && chk.type == "checkbox")    
                                        {
                                                chk.checked = checked;
                                                yy_stv_foreachParentCheckbox(nodes[i-1]);
                                                 return;
                                        }
                                }
                        }
                }
        }
}

function yy_stv_foreachChildCheckbox(obj)
{        
/// <summary>单击父复选框时，设置其子复选框的选中状态</summary>

         var checked;
        
         if (obj.tagName == "INPUT" && obj.type == "checkbox")    
        {
                checked = obj.checked;
                 do
                {
                        obj = obj.parentNode;
                }    
                 while (obj.tagName != "TABLE")
        }
        
         var nodes = obj.parentNode.childNodes;
                
         for ( var i=0; i<nodes.length - 1; i++)
        {
                 if (nodes[i] == obj && nodes[i + 1].tagName == "DIV")
                {
                         var elements = nodes[i+1].getElementsByTagName( "INPUT");
                        
                         for (j=0; j< elements.length; j++)    
                        {                
                                 if (elements[j].type == 'checkbox')    
                                {
                                        elements[j].checked = checked;
                                }
                        }        
                }
        }
}

function yy_stv_foreachParentCheckbox(obj)
{        
/// <summary>单击某一复选框时，设置其父复选框的选中状态</summary>

         var checkedNum = 0;
         var uncheckedNum = 0;
        
         if (obj.tagName == "INPUT" && obj.type == "checkbox")    
        {
                 do
                {
                        obj = obj.parentNode;
                }    
                 while (obj.tagName != "TABLE")
        }
                                
         var tables = obj.parentNode.getElementsByTagName( "TABLE");
            
         if ( typeof(tables) == 'undefined') return;
                
         for ( var i=0; i < tables.length; i++)
        {                
                 for ( var x=0; x < tables[i].rows.length; x++)
                {
                         for ( var j=0; j < tables[i].rows[x].cells.length; j++)
                        {
                                 var chk = tables[i].rows[x].cells[j].childNodes[0];
                                 if ( typeof(chk) != 'undefined' && chk.tagName == "INPUT" && chk.type == "checkbox")    
                                {
                                         if (chk.checked)
                                                checkedNum ++;
                                         else
                                                uncheckedNum ++;
                                }
                        }
                }
        }
        
         if (uncheckedNum == 0)
        {
                yy_stv_checkParentCheckbox(obj, true);
        }
         else
        {
                yy_stv_checkParentCheckbox(obj, false);
        }
}


function yy_stv_attachCheckboxClickListener()
{
/// <summary>监听全部联动复选框的单击事件</summary>

         var elements =    document.getElementsByTagName( "INPUT");
        
         for (i=0; i< elements.length; i++)    
        {                
                 if (elements[i].type == 'checkbox')    
                {
                         for (j=0; j<yy_stv_ccTreeView_pre.length; j++)
                        {
                                 if (elements[i].id.yy_stv_startsWith(yy_stv_ccTreeView_pre[j]))
                                {
                                        yy_stv_addEvent(elements[i], 'click', yy_stv_ccClickCheckbox);    
                                         break;
                                }
                        }
                }
        }        
}

if (document.all)
{
        window.attachEvent(' yy_stv_attachCheckboxClickListener);
}
else
{
        window.addEventListener('load', yy_stv_attachCheckboxClickListener, false);
}
/*联动复选框 结束*/

 

说明：
一、页面加载时为指定的TreeView的全部复选框绑定单击事件（根据复选框的前缀判断其是否属于指定的复选框）
二、单击某复选框，则遍历其全部子复选框，并进行相应的操做。同时，遍历同级复选框，并对它们的父复选框进行操做，而后再遍历它们的父复选框的同级的复选框，以此类推往上走。

相关的属性

using System;
using System.Collections.Generic;
using System.Text;

using System.ComponentModel;
using System.Web.UI;

namespace YYControls
{
         /// <summary>
         /// SmartTreeView类的属性部分
         /// </summary>
         public partial class SmartTreeView
        {
                 private bool _allowCascadeCheckbox;
                 /// <summary>
                 /// 是否启用联动复选框功能
                 /// </summary>
                [
                Browsable( true),
                Description( "是否启用联动复选框功能"),
                Category( "扩展"),
                DefaultValue( false)
                ]
                 public virtual bool AllowCascadeCheckbox
                {
                        get { return _allowCascadeCheckbox; }
                        set { _allowCascadeCheckbox = value; }
                }

        }
}

 

相关的cs

using System;
using System.Collections.Generic;
using System.Text;

using System.Web.UI.WebControls;
using System.Web.UI;

namespace YYControls.SmartTreeViewFunction
{
         /// <summary>
         /// 扩展功能：联动复选框
         /// </summary>
         public class CascadeCheckboxFunction : ExtendFunction
        {
                 /// <summary>
                 /// 构造函数
                 /// </summary>
                 public CascadeCheckboxFunction()
                        : base()
                {

                }

                 /// <summary>
                 /// 构造函数
                 /// </summary>
                 /// <param name="stv">SmartTreeView对象</param>
                 public CascadeCheckboxFunction(SmartTreeView stv)
                        : base(stv)
                {

                }

                 /// <summary>
                 /// 扩展功能的实现
                 /// </summary>
                 protected override void Execute()
                {
                         this._stv.PreRender += new EventHandler(_stv_PreRender);
                }

                 /// <summary>
                 /// SmartTreeView的PreRender事件
                 /// </summary>
                 /// <param name="sender"></param>
                 /// <param name="e"></param>
                 void _stv_PreRender( object sender, EventArgs e)
                {
                         // 注册向数组中添加成员的脚本
                         if (! this._stv.Page.ClientScript.IsClientScriptBlockRegistered(String.Format( "yy_stv_cascadeCheckbox_{0}", this._stv.ID)))
                        {
                                 this._stv.Page.ClientScript.RegisterClientScriptBlock
                                (
                                         this.GetType(),
                                        String.Format( "yy_stv_cascadeCheckbox_{0}", this._stv.ID),
                                        String.Format( "yy_stv_ccTreeView_pre.push('{0}');", Helper.Common.GetChildControlPrefix( this._stv)),
                                         true
                                );
                        }
                }
        }
}

 

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