[分享]新封装的一个实现无刷新连动下拉列表类(最新版本)

[分享]新封装的一个实现无刷新连动下拉列表类 》的改进版本

变化比较大:
1.改写方法的实现,降低函数的耦合度;
2.解决了上个post中提到的“注册多对下拉列表时就会产生紊乱”的问题;
3.暴露一个方法用于实现一拖n,多级联动问题,使用方法见测试代码;

一般情况下基本够用

下面是源码,欢迎拍砖 
 NoRefreshJointDDL2.cs

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

namespace NoRefreshJointDDL
{
    
/// <summary>
    
/// 
    
/// </summary>

    public class NoRefreshJointDDL2:System.Web.UI.Page
    
{
        
#region 成员变量
        
private string CilentScript;
        
private bool IsWrited = false;
        
#endregion


        
public NoRefreshJointDDL2()
        
{
            CilentScript 
= @"<script language=""javascript""> {0} {1} </script>";
            CilentScript 
= String.Format(CilentScript,"RegisterScriptoylb",GetFunctionCilentScript());
        }


        
/// <summary>
        
/// 设置联动关系,通过暴露此方法来达到多级联动的目的,注意此处只能用于已注册的DropDownList
        
/// </summary>
        
/// <param name="driver">驱动方</param>
        
/// <param name="drivener">从动方</param>

        public void SetDDLsRelation(DropDownList driver,DropDownList drivener)
        
{
            
string ddlDriverID = driver.ID.ToString().Trim();
            
string ddlDrivenerID = drivener.ID.ToString().Trim();
            driver.Attributes[
"onchange"= "javascript:changedownlist(document.Form1," + ddlDriverID + ",Array"+ddlDriverID+"," + ddlDrivenerID + ",Array"+ddlDrivenerID+");";
        }


        
/// <summary>
        
/// 注册需联动的下拉列表
        
/// </summary>
        
/// <param name="driver">驱动方</param>
        
/// <param name="driverRelation">驱动方关系列</param>
        
/// <param name="drivener">从动方</param>
        
/// <param name="drivenerRelation">从动方关系列</param>

        public void RegisterDropDownList(DropDownList driver,string driverRelation,DropDownList drivener,string drivenerRelation)
        
{
            
string strRegisterScript = GetInitArrayScript(driver,driverRelation);
            strRegisterScript 
+= GetInitArrayScript(drivener,drivenerRelation);
            
            
//这里使用“RegisterScriptoylb”继续占位,留予下次注册下拉列表,最后注册脚本时将清除
            CilentScript = CilentScript.Replace("RegisterScriptoylb","RegisterScriptoylb "+strRegisterScript);

            SetDDLsRelation(driver,drivener);
        }

    
        
/// <summary>
        
/// 注册需联动的下拉列表
        
/// </summary>
        
/// <param name="driver">驱动方</param>
        
/// <param name="driverRelation">驱动方关系列</param>
        
/// <param name="drivener">从动方</param>
        
/// <param name="drivenerRelation">从动方关系列</param>
        
/// <param name="iswrite">是否直接写入客户端</param>

        public void RegisterDropDownList(DropDownList driver,string driverRelation,DropDownList drivener,string drivenerRelation,bool iswrite)
        
{
            RegisterDropDownList(driver,driverRelation,drivener,drivenerRelation);
            
            
if (iswrite)
            
{
                WriteScriptToCilent();
                IsWrited 
= true;
            }

        }


        
//获取初始化数组脚本
        private string GetInitArrayScript(DropDownList ddl,string driverRelation)
        
{
            
//驱动部分
            string strValueField    = ddl.DataValueField;        //编码列
            string strTextField        = ddl.DataTextField;        //显示列
            string strRelation        = driverRelation;            //关系列

            
//数据源
            DataTable dtSource = (DataTable)(ddl.DataSource);

            
//组成变量
            string ddlID = ddl.ID.ToString().Trim();
            
string strCount = "count"+ddlID;
            
string strArray = "Array"+ddlID;

            
            
string strRegisterScript = @"
                var {0} = 0;
                {1} = new Array();
";

            strRegisterScript 
= String.Format(strRegisterScript,strCount,strArray);
            
            
//初始化数组值
            DataRow drDriver = null;
            
            
for(int i = 0;i <dtSource.Rows.Count ;i++)
            
{
                drDriver 
= dtSource.Rows[i];
                strRegisterScript 
+= String.Format(strArray+"["+strCount+"++] = new Array(\"{0}\",\"{1}\",\"{2}\");\n", drDriver[strValueField].ToString(),drDriver[strTextField].ToString(), drDriver[strRelation].ToString());
            }


            
return strRegisterScript;
        }


        
//根据驱动方选择的项,初始化从动方数据
        private void InitDrivener(DropDownList driver,string driverRelation,DropDownList drivener,string drivenerRelation)
        
{
            
//取得数据源
            DataTable dtDriver = (DataTable)(driver.DataSource);
            DataTable dtDrivener 
= (DataTable)(drivener.DataSource);

            
//获取选定值,并过滤从动下拉列表的数据
            int iIndex = GetSelectRowID(driver);

            DataRow drFilter 
= dtDriver.Rows[iIndex];
            
string strRelate = drFilter[driverRelation].ToString().Trim();

            DataView dv 
= new DataView(dtDrivener);
            dv.RowFilter 
= driverRelation + "='"+strRelate+"'";

            drivener.Items.Clear();
            drivener.DataSource 
= dv;
            drivener.DataTextField 
= drivener.DataValueField;;
            drivener.DataValueField 
= drivener.DataTextField;
            drivener.DataBind();
        }


        
//得到下拉列表选定值所在数据源行的行号
        private int GetSelectRowID(DropDownList ddl)
        
{
            
string strValueFiled = ddl.DataValueField;
            
string strSelectValue =    ddl.SelectedValue.ToString();

            DataView dv 
= new DataView((DataTable)(ddl.DataSource));
            dv.Sort 
= strValueFiled;

            
return dv.Find(strSelectValue);
        }


        
//得到事件函数脚本
        private string GetFunctionCilentScript()
        
{
            
string strScript = @"        
            function changedownlist(myfrm,Driver,ArrayDriver,Drivener,ArrayDrivener)
            {
                var SelectedBigId,i,j,SelectDataType;
                
                for (i= Drivener.options.length-1;i>=0 ;--i)      
                {
                    Drivener.options[i] = null; 
                }
            
                SelectedBigId = Driver.options[Driver.selectedIndex].value;
            
                for (i=0;i<ArrayDriver.length;i++)
                {
                    if (SelectedBigId == ArrayDriver[i][0])
                    {
                        SelectDataType = ArrayDriver[i][2];
                        break;
                    }
                }
            
                j = 0;    
                
                for (i=0 ;i< ArrayDrivener.length ;i++)      
                {
                    if (SelectDataType == ArrayDrivener[i][2])
                    {
                        Drivener.options[j] = new Option(ArrayDrivener[i][1],ArrayDrivener[i][0]); 
                        ++j;
                    }
                }
            }
";
            
return strScript;
        }


        
/// <summary>
        
/// 写入脚本
        
/// </summary>

        public void WriteScriptToCilent()
        
{
            
if (IsWrited)
            
{
                
throw new Exception("自定义错误信息:重复写入客户端脚本,注册联动下拉列表失败!");
            }


            
//去掉占位字符串
            string strCilentScript = CilentScript.Replace("RegisterScriptoylb","");

            
//将脚本写入客户端
            HttpContext.Current.Response.Write(strCilentScript);
        }

    }

}

测试代码:

protected System.Web.UI.WebControls.DropDownList ddlDrivener;
        
protected System.Web.UI.WebControls.DropDownList ddlDriver2;
        
protected System.Web.UI.WebControls.DropDownList ddlDrivener2;
        
protected System.Web.UI.WebControls.DropDownList ddlDriver;
    
        
private void Page_Load(object sender, System.EventArgs e)
        
{
            
if (!IsPostBack)
            
{
                DataTable dtType 
= new DataTable();
                dtType.Columns.Add(
"TypeCode");
                dtType.Columns.Add(
"TypeName");
                dtType.Columns.Add(
"DataType");

                DataTable dtValue 
= new DataTable("MyTable");

                dtValue.Columns.Add(
"ValueCode");
                dtValue.Columns.Add(
"ValueName");
                dtValue.Columns.Add(
"DataType");

                DataRow Dr 
= dtType.NewRow();
                Dr[
"TypeCode"= "AllMoney";
                Dr[
"TypeName"= "应发工资";
                Dr[
"DataType"= "Num";
                dtType.Rows.Add(Dr);

                DataRow Dr1 
= dtType.NewRow();
                Dr1[
"TypeCode"= "Uid";
                Dr1[
"TypeName"= "身份证号码";
                Dr1[
"DataType"= "Char";
                dtType.Rows.Add(Dr1);

                DataRow Dr2 
= dtType.NewRow();
                Dr2[
"TypeCode"= "Worker";
                Dr2[
"TypeName"= "行政职务";
                Dr2[
"DataType"= "Meg";
                dtType.Rows.Add(Dr2);
                
                
//开始添加第二个表中的内容
                DataRow Dr3 = dtValue.NewRow();
                Dr3[
"ValueCode"= "=";
                Dr3[
"ValueName"= "等于";
                Dr3[
"DataType"= "Num";
                dtValue.Rows.Add(Dr3);

                DataRow Dr4 
= dtValue.NewRow();
                Dr4[
"ValueCode"= "<>";
                Dr4[
"ValueName"= "不等于";
                Dr4[
"DataType"= "Char";
                dtValue.Rows.Add(Dr4);

                DataRow Dr5 
= dtValue.NewRow();
                Dr5[
"ValueCode"= "like";
                Dr5[
"ValueName"= "相似";
                Dr5[
"DataType"= "Char";
                dtValue.Rows.Add(Dr5);

                DataRow Dr6 
= dtValue.NewRow();
                Dr6[
"ValueCode"= ">";
                Dr6[
"ValueName"= "大于";
                Dr6[
"DataType"= "Num";
                dtValue.Rows.Add(Dr6);


                DataRow Dr7 
= dtValue.NewRow();
                Dr7[
"ValueCode"= "=";
                Dr7[
"ValueName"= "";
                Dr7[
"DataType"= "Meg";
                dtValue.Rows.Add(Dr7);

                DataRow Dr8 
= dtValue.NewRow();
                Dr8[
"ValueCode"= "=";
                Dr8[
"ValueName"= "";
                Dr8[
"DataType"= "Meg";
                dtValue.Rows.Add(Dr8); 

                

                ddlDriver.DataSource 
= dtType;
                ddlDriver.DataTextField 
= "TypeName";
                ddlDriver.DataValueField 
= "TypeCode";
                ddlDriver.DataBind();

                ddlDriver.SelectedIndex 
= 2;

                ddlDrivener.DataSource 
= dtValue;
                ddlDrivener.DataTextField 
="ValueName";
                ddlDrivener.DataValueField 
= "ValueCode";
                ddlDrivener.DataBind();

                ddlDriver2.DataSource 
= dtType;
                ddlDriver2.DataTextField 
= "TypeName";
                ddlDriver2.DataValueField 
= "TypeCode";
                ddlDriver2.DataBind();

                ddlDriver2.SelectedIndex 
= 1;

                ddlDrivener2.DataSource 
= dtValue;
                ddlDrivener2.DataTextField 
="ValueName";
                ddlDrivener2.DataValueField 
= "ValueCode";
                ddlDrivener2.DataBind();
                
                NoRefreshJointDDL2 uc 
= new NoRefreshJointDDL2();
                uc.RegisterDropDownList(ddlDriver,
"DataType",ddlDrivener,"DataType");
                uc.RegisterDropDownList(ddlDriver2,
"DataType",ddlDrivener2,"DataType",true);

                
//--------------------下面设置可出现一拖二,多级连动效果,测试时可逐个设置
                
//设置出现一拖二
                uc.SetDDLsRelation(ddlDriver,ddlDrivener2);

//                //设置出现多级连动
//                uc.SetDDLsRelation(ddlDriver,ddlDriver2);
            }

源码下载:NoRefreshJointDDL2.0.rar
posted @ 2005-07-11 14:34  冰戈  阅读(...)  评论(...编辑  收藏