asp.net---jquery--ajax 实现滚动条滚动到底部分页显示

前台：aspx页面

 var bgtime = $(" #date1 ").val();
         var overtime = $(" #date2 ").val();
         var gsid = "";
         var typename = "";
         var divstyle = "";
         var bgpage; //定义开始页面
         var recordCount; //数据总条数
         var pageCount;   //总页数
         //页面加载完成执行
         $(document).ready(function(){
             //$("#date1").attr("value", getNowFormatDate());//推荐这种写法,可正常赋值
             $("#date2").attr("value", getNowFormatDate());
             bgtime = $(" #date1 ").val();
             overtime = $(" #date2 ").val();
             typename = "全部";
             $("#gs").html("");
             $("#data-content").html("");
             $("#leibie").html("");
             $("#gs").append("<div class=\"xuanze xuanze-active\" name=\"0\">全部公司<span class=\"my-icon mui-icon mui-icon-checkmarkempty\"></span></div>");
             $("#leibie").append("<div class=\"xuanze xuanze-active\" name=\"全部\">全部<span class=\"my-icon mui-icon mui-icon-checkmarkempty\"></span></div>");
             InitPage(,);  //这里是调用InitPage(pageIndex,pageSize)方法,pageIndex:起始页，pageSize:每页的数据条数
         });
 　　　　　//监听滚轮事件
         window.onscroll = function () {
             if (getScrollHeight() == getWindowHeight() + getDocumentTop()) {       //当滚动条到底时,这里是触发内容
                 //异步请求数据,局部刷新dom
                 if (bgpage >= parseInt(pageCount))  //开始页数大于所有数据总页数
                 {
                     alert("已经到底部了")
                 }
                 else {
                     alert(bgpage)  //页数
                     onscoll(bgpage, );调用onscoll(pageIndex,pageSize)
                 }
             }
         };
         //页面加载完成添加数据的方法
         function InitPage(pageIndex, pageSize) {
             $.ajax({
                 url: "SlcBuyTp.ashx",
                 type: 'post',
                 //contentType: "application/json;charset=UTF-8",
                 data: { "gsname": gsid, "bgtime": bgtime, "overtime": overtime, "type": typename, "pageIndex": pageIndex, "pageSize": pageSize },//encodeURI(encodeURI(typename))  escape(typename)
                 cache: true,
                 success: function (d) {
                     //alert(d);
                     //console.log(new Date().getTime());
                     var obj = eval('(' + d + ')');  //数组
                     recordCount = obj.table2[].recordcount;  //记录数据总条数
                     pageCount = obj.table2[].pagecount;      //记录总页数
                     for (var index = ; index < obj.gsname.length; index++) {
                         var item = obj.gsname[index];
                         $("#gs").append("<div class=\"xuanze\" name=\"" + item.gsid + "\">" + item.gsname + "<span class=\"my-icon mui-icon mui-icon-checkmarkempty\"></span></div>");
                     }
                     for (var index = ; index < obj.type.length; index++) {  //添加类型名称
                         var item = obj.type[index];
                         $("#leibie").append("<div class=\"xuanze\" name=\"" + item.leibie + "\">" + item.leibie + "<span class=\"my-icon mui-icon mui-icon-checkmarkempty\"></span></div>");
                     }
                     if (obj.datas.length == ) {
                         var kong = "<div class=\"tb-content\"><div style=\"with:100%;hight:20px;text-align:center;position: absolute;margin: 50%;\">没有数据</div></div>"
                         $("#data-content").empty().append(kong);
                     }
                     else {
                             for(var i=;i<obj.datas.length;i++)
                             {
                                 var item = obj.datas[i];
                                 divstyle = "<div class=\"tb-content\"><table class=\"tb\"><tr><td style=\"width:35%;\">单据日期：" + item.riqi + "</td><td style=\"width:65%\">订单接收方：" + item.jsgs + "</td></tr><tr><td>物料类别：" + item.typename + "</td><td>物料名称：" + item.name + "</td></tr><tr><td>规格型号：" + item.gg + "</td><td>采购备注：" + item.beizhu + "</td></tr><tr><td>计量单位：" + item.jldw + "</td><td>数量：" + item.shuliang + "</td></tr><tr><td>需求部门：" + item.xqbm + "</td><td>本币含税金额：" + item.bbje + "</td></tr><tr><td>需求人员：" + item.xqry + "</td><td>采购部门：" + item.cgbm + "</td></tr><tr><td>采购人员：" + item.cgry + "</td><td></td></tr></table></div>";
                                 $("#data-content").append(divstyle);
                             }
                     };
                     bgpage=parseInt(pageIndex) +   //起始页+1
                 },
                 error: function (XMLHttpRequest, textStatus, errorThrown) {
                     alert("请求数据失败,XMLHttpRequest 对象:" + JSON.stringify(XMLHttpRequest) + ",  错误信息:" + textStatus + ", 捕获的错误对象:" + errorThrown);
                 },
             });
         }
         //滚动条到底部添加数据的方法
         function onscoll(pageIndex, pageSize) {
             $.ajax({
                 url: "SlcBuyTp.ashx",
                 type: 'post',
                 //contentType: "application/json;charset=UTF-8",
                 data: { "gsname": gsid, "bgtime": bgtime, "overtime": overtime, "type": typename, "pageIndex": pageIndex, "pageSize": pageSize },//encodeURI(encodeURI(typename))  escape(typename)
                 cache: true,
                 success: function (d) {
                     //alert(d);
                     //console.log(new Date().getTime());
                     var obj = eval('(' + d + ')');  //数组
                     var recordCount = obj.table2[].recordcount;  //记录总条数
                     pageCount = obj.table2[].pagecount;   //记录总页数
                     if (obj.datas.length == ) {
                         var kong = "<div class=\"tb-content\"><div style=\"with:100%;hight:20px;text-align:center;position: absolute;margin: 50%;\">没有数据</div></div>"
                         $("#data-content").empty().append(kong);
                     }
                     else {
                         for (var i = ; i < obj.datas.length; i++) {
                             var item = obj.datas[i];
                             divstyle = "<div class=\"tb-content\"><table class=\"tb\"><tr><td style=\"width:35%;\">单据日期：" + item.riqi + "</td><td style=\"width:65%\">订单接收方：" + item.jsgs + "</td></tr><tr><td>物料类别：" + item.typename + "</td><td>物料名称：" + item.name + "</td></tr><tr><td>规格型号：" + item.gg + "</td><td>采购备注：" + item.beizhu + "</td></tr><tr><td>计量单位：" + item.jldw + "</td><td>数量：" + item.shuliang + "</td></tr><tr><td>需求部门：" + item.xqbm + "</td><td>本币含税金额：" + item.bbje + "</td></tr><tr><td>需求人员：" + item.xqry + "</td><td>采购部门：" + item.cgbm + "</td></tr><tr><td>采购人员：" + item.cgry + "</td><td></td></tr></table></div>";
                             $("#data-content").append(divstyle);
                         }
                     };
                         bgpage = parseInt(pageIndex) +   //起始页+1
                 },
                 error: function (XMLHttpRequest, textStatus, errorThrown) {
                     alert("请求数据失败,XMLHttpRequest 对象:" + JSON.stringify(XMLHttpRequest) + ",  错误信息:" + textStatus + ", 捕获的错误对象:" + errorThrown);
                 },
             });
         }

后台：ashx页面

<%@ WebHandler Language="C#" Class="SlcBuyTp" %>

using System;
using System.Web;
using System.Data;
using cschef;

public class SlcBuyTp : IHttpHandler {
    protected static int RecordCount = ;  //记录数据总行数
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        string type;
        string datas;
        string gsbh = context.Request.Form["gsname"];//如果是get方式应该用context.Request.QueryString
        string bgtime = context.Request.Form["bgtime"];//如果是get方式应该用context.Request.QueryString
        string overtime = context.Request.Form["overtime"];//如果是get方式应该用context.Request.QueryString
        string typename = context.Request.Form["type"];//如果是get方式应该用context.Request.QueryString
        int pageIndex = CC.ToInt(context.Request.Form["pageIndex"]);  //起始页
        int pageSize =CC.ToInt(context.Request.Form["pageSize"]);//每个页面数据条数
        #region 分页配置
        if (pageIndex == ) { pageIndex = ; }
        #endregion
        if (gsbh == "")
        {
            if(typename == "全部")
            {
                datas = @"select CONVERT(varchar(100), djrq, 23) riqi,wllbmc typename,ghdw jsgs,wlmc name,cpgg gg,bz beizhu,jldw jldw,sl shuliang,bbje bbje,xqbm xqbm,xqry xqry,cgbm cgbm,cgry cgry
                        from t_cgmx where djrq between '"+bgtime+"' and '"+overtime+"'";
            }
            else
            {
                datas = @"select CONVERT(varchar(100), djrq, 23) riqi,wllbmc typename,ghdw jsgs,wlmc name,cpgg gg,bz beizhu,jldw jldw,sl shuliang,bbje bbje,xqbm xqbm,xqry xqry,cgbm cgbm,cgry cgry
                    from t_cgmx where djrq between '"+bgtime+"' and '"+overtime+"' and wllbmc='"+typename+"'";
            }
        }
        else
        {
            //gsbh!=0
            if(typename == "全部")
            {
                datas = @"select CONVERT(varchar(100), djrq, 23) riqi,wllbmc typename,ghdw jsgs,wlmc name,cpgg gg,bz beizhu,jldw jldw,sl shuliang,bbje bbje,xqbm xqbm,xqry xqry,cgbm cgbm,cgry cgry
                        from t_cgmx where djrq between '"+bgtime+"' and '"+overtime+"' and gsbh='"+gsbh+"'";
            }
            else
            {
                datas =@"select CONVERT(varchar(100), djrq, 23) riqi,wllbmc typename,ghdw jsgs,wlmc name,cpgg gg,bz beizhu,jldw jldw,sl shuliang,bbje bbje,xqbm xqbm,xqry xqry,cgbm cgbm,cgry cgry
                        from t_cgmx where djrq between '"+bgtime+"' and '"+overtime+"' and gsbh='"+gsbh+"'and wllbmc='"+typename+"'";
            }

        }
        DataTable TbDatas = new DataTable();
        TbDatas = DBHelper.DBContext.Default.GetDataTable(datas);
        RecordCount = TbDatas.Rows.Count;    //数据总条数
        DataTable dtData = new DataTable();    //数据表
        if(RecordCount==)    //如果没有数据
        {
            dtData = TbDatas;
        }
        else  //否则
        {
            dtData = GetPagedTable(TbDatas, pageIndex, pageSize);//调用 GetPagedTable(DataTable dt, int PageIndex, int PageSize)方法，为TbDatas进行分页
        }
        DataTable dtCount = new DataTable();  //记录TbDatas数据表的总数据条数和总页数的表
        dtCount.TableName = "table2";
        dtCount.Columns.Add("recordcount"); //给一列命名
        dtCount.Rows.Add(RecordCount);    //添加dt的行数到dtCount
        dtCount.Columns.Add("pagecount");  //添加dt的行名，第二列
        dtCount.Rows[]["pagecount"]=getPageCount(TbDatas.Rows.Count,pageSize);  //将总数据页数添加到pagecount列
        dtData.TableName = "datas";
        DataSet ds = new DataSet();
        ds.Tables.Add(dtData);
        ds.Tables.Add(dtCount);
        string JsonString1 = Newtonsoft.Json.JsonConvert.SerializeObject(ds);  //转换成json
        context.Response.Write(JsonString1);
    }

    /// <summary>
    /// 对DataTable进行分页,起始页为1
    /// </summary>
    /// <param name="dt">查询出的数据表</param>
    /// <param name="PageIndex">起始页</param>
    /// <param name="PageSize">每页数据条数</param>
    /// <returns></returns>
    public static DataTable GetPagedTable(DataTable dt, int PageIndex, int PageSize)
    {
        if (PageIndex == )
            return dt;
        DataTable newdt = dt.Copy();
        newdt.Clear();
        int rowbegin = (PageIndex - ) * PageSize;
        int rowend = PageIndex * PageSize;
        if (rowbegin >= dt.Rows.Count)
            return newdt;
        if (rowend > dt.Rows.Count)
            rowend = dt.Rows.Count;
        for (int i = rowbegin; i <= rowend - ; i++)
        {
            DataRow newdr = newdt.NewRow();
            DataRow dr = dt.Rows[i];
            foreach (DataColumn column in dt.Columns)
            {
                newdr[column.ColumnName] = dr[column.ColumnName];
            }
            newdt.Rows.Add(newdr);
        }
        return newdt;
    }
    /// <summary>
    /// 获取总页数
    /// </summary>
    /// <param name="sumCount">结果集数量</param>
    /// <param name="pageSize">页面数量</param>
    /// <returns></returns>
    public static int getPageCount(int sumCount, int pageSize)
    {
        int page = sumCount / pageSize;
        if (sumCount % pageSize > )
        {
            page = page + ;
        }
        return page;
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}