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用Ajax提交数据到ashx处理数据

闲来无事,把最近使用Ajax无刷新开发的一些知识整理一下,一边回顾:
项目一:修改密码
  HTML代码:
    <input id="txtOriginalPass" type="text" />
    <input id="txtNewPass" type="text" />
    <input id="txtConfirmPass" type="text" />
        <input id="btnSubmit" type="button" value="确认" onclick="ConfirmChange()" />
        <input id="btnCancel" type="button" value="取消" />
  js脚本:
    <script type="text/javascript">
          function ConfirmChange() {
              $.ajax({
                    type: "POST",    //页面请求的类型,通常使用POST,那么处理页需要使用Request.Form["参数名称"]来获取页面传递的参数
                    url: "UpdatePasswordOfUser.ashx",   //处理页的相对地址
                    data: { OriginalPass: $('#txtOriginalPass').val(), NewPass: $('#txtNewPass').val(), RePass: $('#txtConfirmPass').val() },                    
                    success: function (msg) {    //这是处理后执行的函数,msg是处理页返回的数据
                       alert(msg);
                   }
              });
            }
    </script>
  ashx处理页面的代码:
           public void ProcessRequest(HttpContext context)
           {
               context.Response.ContentType = "text/plain";
               string OriPass = context.Request.Form["OriginalPass"];   //原始密码(Get传参对应QueryString)
               string txtNewPass = context.Request.Form["NewPass"];     //新密码
               string txtConfirmPass = context.Request.Form["RePass"];  //确认密码
       /*-----这里可以写调用的函数------*/
               context.Response.Write("密码修改成功");   //返回信息
           }


 项目二:两个DropDownList下拉列表无刷新的联动:
      对于第一个DropDownList显示的数据,实在页面加载的时候赋的数据源,当这个DropDownList选项发生变化时,把数据发送到处理页,
      然后处理页返回数据给第二个DropDownList
  HTML代码:
    <asp:DropDownList ID="ddlDeptNameOfSign" runat="server" Width="200px" onchange="GetChildDrop()"></asp:DropDownList>
    <asp:DropDownList ID="ddlUserOfSign" runat="server" Width="200px" onchange="GetChildItem()"></asp:DropDownList>
   js脚本:
    <script type="text/javascript">
           //页面加载时进行下拉列表的初始化
        $(document).ready(function () {   
            var childDrop = "<%=ddlUserOfSign.ClientID %>";  //人员
            $('#' + childDrop).append("<option value='0'>---请选择签约人员---</option>");  //此处的value为0,为了数据处理方便,建议不要省略
        })
        //页面加载的时候,绑定下拉列表:签约部门、签约人员
        function GetChildDrop() {
            var parentDrop = "<%=ddlDeptNameOfSign.ClientID %>";  //部门
            var childDrop = "<%=ddlUserOfSign.ClientID %>";  //人员
            $('#' + childDrop + ' option').remove();
            $.ajax({
                type: "POST",
                url: ".../Pages/DepartmentUserOfSign.ashx",
                data: { "parentDrop": $('#' + parentDrop).val() },
                success: function (data) {
                    if (data != "") {
                        var returnValue = data.split(",");
                        $('#' + childDrop).append("<option value='0'>---请选择签约人员---</option>");
                        $('#' + childDrop + ' option:first').attr('selected', 'true');
                        for (var i = 0; i < returnValue.length - 1; i++) {
                            if (i % 2 == 0) {
                                $('#' + childDrop).append("<option value=" + returnValue[i] + ">" + returnValue[i + 1] + "</option>");
                                $('#' + childDrop).val(returnValue[i+1]);
                            }
                        }
                    }
                    else {
                        alert("没有对应的签约人员.");
                    }
                }
            });
        }
     //当子列表改变选项时,发送到处理页面,用于记忆选中的值,用这种方法有点猥琐,但是无刷新时加载的数据在.NET页面的后台是获取不到的
     function GetChildItem() {
            var childDrop1 = "<%=ddlUserOfSign.ClientID %>";  //人员
            $.ajax({
                type: "POST",
                url: ".../Pages/handleLoginNameOfContract.ashx",
                data: { "childDrop": $('#' + childDrop1).val() },
                success: function (data) {
                }
            });
        }

    </script>
   ashx处理页面代码:
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string departmentValue = context.Request.Form["parentDrop"];
            if (!string.IsNullOrEmpty(departmentValue))
            {
                //不为空
                string sql = "select UserID,LoginName from tb_User where OrganizationID=" + departmentValue + "";
                string TheReturnValue = null;   //返回值
                SqlConnection conn = null;
                SqlCommand cmd = null;
                SqlDataAdapter adapter = null;
                using (conn = new SqlConnection("---------连接字符串--------"))
                {
                    if (conn.State == ConnectionState.Closed)
                    {
                        conn.Open();
                    }
                    if (conn.State == ConnectionState.Broken)
                    {
                        conn.Close();
                        conn.Open();
                    }
                    try
                    {
                        cmd = new SqlCommand(sql, conn);
                        adapter = new SqlDataAdapter(cmd);
                        DataSet ds = new DataSet();
                        adapter.Fill(ds);
                        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                        {
                            TheReturnValue += ds.Tables[0].Rows[i][0].ToString() +","+ ds.Tables[0].Rows[i][1].ToString();
                            TheReturnValue += ",";
                        }
                        context.Response.Write(TheReturnValue);        
                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                }
            }
            else
            {
                context.Response.Write("false");      
            }
        }

   另一个处理页:
      public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            string loginName = context.Request.Form["childDrop"];
            context.Session["contractLoginName"] = loginName;
        }


第三个项目:
 两个DropDownList,一个TextBox,根据两个DropDownList选中的值,当在文本框中输入数据时,可以显示仿照百度式的搜索列表,当选中后文本库的值后,按一下Enter,
 本人技术有限,不能实现百度那样的选中值后自动查找
 DropDownList:区域
 DropDownList:街道
 TextBox:物业地址
     HTML代码:
    <div>
                <asp:DropDownList ID="dropqy" runat="server" DataValueField="DistrictID" DataTextField="name" onchange="RegionChange()">
                </asp:DropDownList>
                <asp:DropDownList ID="ddlCommunity" runat="server" DataValueField="CommunityID" DataTextField="CommunityName" onchange="handleCommunity()">
                </asp:DropDownList>
                <asp:TextBox ID="txtdz" runat="server" key="地址"></asp:TextBox>
                <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="搜索" style="display:none"/>
        </div>
     js脚本:

    <link href="http://www.cnblogs.com/Styles/jquery.ui.autocomplete.css" rel="stylesheet" type="text/css" />
    <script src="//www.cnblogs.com/Scripts/jquery-1.7.2.js" type="text/javascript"></script>
    <script src="//www.cnblogs.com/Scripts/jquery-ui-1.8.22.custom.js" type="text/javascript"></script>
     $(function () {
            var d = "<%=txtdz.ClientID %>";
            var RegionName = "<%=dropqy.ClientID %>";
            var CommunityName = "<%=ddlCommunity.ClientID %>";
            $("#" + d).autocomplete({
                source: function (request, response) {
                    $.ajax({
                        url: "http://www.cnblogs.com/Pages/SearchHouseInfoForAcceptPage.ashx?keyword=" + encodeURIComponent(request.term) + "&&parentDrop=" + encodeURIComponent($('#' + RegionName).val()) + "&&childDrop=" + encodeURIComponent($('#' + CommunityName).val()) + "",
                        data: {
                            name: request.term
                        },
                        dataType: "json",
                        success: function (data) {
                            response($.map(data, function (item) {
                                return { value: item };
                            }));
                        }
                    });
                }
            });
        });
   function document.onkeydown() {
          var btn = "<%=Button1.ClientID %>";
          var button = document.getElementById(btn);
          if (event.keyCode == 13) {
              button.click();
              event.returnValue = false;
          }
      }
    后台代码:
 在Page_Load中
     //定义文本框的事件,当触发文本框的事件时,触发按钮的事件
            this.txtdz.Attributes["onkeypress"] = "if(event.keyCode==13){" + this.Button1.ClientID + ".click();return false;}";
 使用委托:
  //获取选中的物业地址,传给父页面
  public class UserControlEventTest : EventArgs
  {
      public string _address;
      public UserControlEventTest(string address)
      {
   this._address = address;
      }
  }
  public delegate void SubmitUserHandler(object sender, UserControlEventTest e);
  public event SubmitUserHandler SubmitUserEvent;
  protected void Button1_Click(object sender, EventArgs e)
  {
      UserControlEventTest userControlEventTest = new UserControlEventTest(txtdz.Text);
      SubmitUserEvent(this, userControlEventTest);
  }

 ashx处理页面代码:
            string keyword = context.Request.QueryString["keyword"];
            keyword = System.Web.HttpUtility.UrlDecode(keyword);
            regionID = context.Request.QueryString["parentDrop"];
            communityID = context.Request.QueryString["childDrop"];

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