蓝驿轨迹-ajax+xml实现省市区无刷新联动源码

帮助：

1.前台添加html控件
<script language="javascript" src="js/PCA.js"></script>

<!--省市区-->
<INPUT id="lbl_provice" type="text" runat="server" style="DISPLAY: none" value="浙江省">
<INPUT id="lbl_city" type="text" runat="server" style="DISPLAY: none" value="杭州市">
<INPUT id="lbl_area" type="text" runat="server" style="DISPLAY: none">
在前台拖放3个DropDownList控件：DropDownList1,DropDownList2,DropDownList3

2.cs页面添加代码
复制ajax 三级省市区联动xml 内的代码到你的项目中->在Class1.cs中
同时引用命名空间 using System.Xml;
同时在Page_Load()添加
Ajax.Utility.RegisterTypeForAjax(typeof(register));//register 为你页面的类文件名，如果更改请同时替换PCA.js中调用的类名
BindDropDownList();

3.拷贝ChinaArea.xml 文件到您所在项目跟目录中

4.web.config 中配置ajax
<system.web>
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory,Ajax" />
</httpHandlers>
</system.web>

作者：蓝驿轨迹 来源于:http://twh.cnblogs.com

效果图如下:

关键代码:

/// <summary>
		/// 初始化绑定省级下拉框
		/// </summary>
		protected void BindDropDownList()
		{
			XmlDocument xmlDoc = new XmlDocument();
			xmlDoc.Load(Server.MapPath("ChinaArea.xml"));
			XmlNodeList nodelist = xmlDoc.SelectNodes("area/province[@provinceID]");
			ListItem li = null;
			foreach (XmlNode myNode in nodelist)
			{
				li = new ListItem();
				li.Value =myNode.Attributes["provinceID"].Value;
				li.Text = myNode.Attributes["province"].Value;
				this.DropDownList1.Items.Add(li);
			}
			this.DropDownList1.SelectedIndex= 10;

			nodelist = xmlDoc.SelectNodes("area/province[@provinceID=330000]/City");
			foreach (XmlNode myNode in nodelist)
			{
				li = new ListItem();
				li.Value =myNode.Attributes["CityID"].Value;
				li.Text = myNode.Attributes["City"].Value;
				this.DropDownList2.Items.Add(li);
			}
			this.DropDownList2.SelectedIndex = 0;

			nodelist = xmlDoc.SelectNodes("area/province/City[@CityID=330100]/Piecearea");
			foreach (XmlNode myNode in nodelist)
			{
				li = new ListItem();
				li.Value =myNode.Attributes["PieceareaID"].Value;
				li.Text = myNode.Attributes["Piecearea"].Value;
				this.DropDownList3.Items.Add(li);
			}

			DropDownList1.Attributes.Add("onchange","CityResult(this.options[selectedIndex],'DropDownList2')");
			DropDownList2.Attributes.Add("onchange","AreaResult(this.options[selectedIndex],'DropDownList3')");
			DropDownList3.Attributes.Add("onchange","AreaResultV(this.options[selectedIndex],'DropDownList3')");
        
		}

		//创建服务器端方法。只要给一个方法加上[AjaxPro.AjaxMethod]标记,该方法就变成一个AjaxPro可进行映射调用的方法
        [Ajax.AjaxMethod]
        //该方法我们将实现从客户端传入一个参数，在服务器端进行查询后返回到客户端。
        public DataSet BindCity(string parent_id,string _ddl)
        {            
            XmlDocument xmlDoc = new XmlDocument();
            try
            {
                xmlDoc.Load(Server.MapPath("../ChinaArea.xml"));
            }
            catch (Exception ex)
            {
                string aa = ex.Message;
                string i = "";
            }
            XmlNodeList nodelist = xmlDoc.SelectNodes("area/province[@provinceID=" + parent_id + "]/City");
            DataTable myDataTable = new DataTable();
            DataColumn myColumn;
            DataRow myRow;
            string Value = "",Text = "";
            myColumn = new DataColumn();
            myColumn.DataType = System.Type.GetType("System.String");
            myColumn.ColumnName = "Value";
            myDataTable.Columns.Add(myColumn);

            myColumn = new DataColumn();
            myColumn.DataType = Type.GetType("System.String");
            myColumn.ColumnName = "Text";
            myDataTable.Columns.Add(myColumn);

            foreach (XmlNode myNode in nodelist)
            {
                myRow = myDataTable.NewRow();
                Value = myNode.Attributes["CityID"].Value;
                Text = myNode.Attributes["City"].Value;
                myRow["Value"] = Value;
                myRow["Text"] = Text;
                myDataTable.Rows.Add(myRow);
            }
            DataSet ds = new DataSet();
            ds.Tables.Add(myDataTable);
            return ds;
        }

		[Ajax.AjaxMethod]
		public DataSet BindArea(string child_id,string _ddl)
		{			
			XmlDocument xmlDoc = new XmlDocument();
			xmlDoc.Load(Server.MapPath("../ChinaArea.xml"));
			XmlNodeList nodelist = xmlDoc.SelectNodes("area/province/City[@CityID="+child_id+"]/Piecearea");
			DataTable myDataTable = new DataTable();
			DataColumn myColumn;
			DataRow myRow; 
			string Value = "",Text="";
			myColumn = new DataColumn();
			myColumn.DataType = System.Type.GetType("System.String");
			myColumn.ColumnName = "Value";
			myDataTable.Columns.Add(myColumn);

			myColumn = new DataColumn();
			myColumn.DataType = Type.GetType("System.String");
			myColumn.ColumnName = "Text";
			myDataTable.Columns.Add(myColumn);

			foreach (XmlNode myNode in nodelist)
			{
				myRow = myDataTable.NewRow();
				Value =myNode.Attributes["PieceareaID"].Value;
				Text = myNode.Attributes["Piecearea"].Value;
				myRow["Value"] = Value;
				myRow["Text"] = Text;
				myDataTable.Rows.Add(myRow);			
			}
			DataSet ds = new DataSet();
			ds.Tables.Add(myDataTable);
			return ds;
		}

案例下载地址1:http://download.csdn.net/detail/lovegonghui/9175805

案例下载地址2:http://down.51cto.com/data/2104898