jQuery Liger~

原文：http://www.cnblogs.com/leoxie2011/archive/2011/05/28/2061406.html

一，ligerGrid是如何工作的。

在没有开始做之前，需要先了解一下ligerGrid是如何工作的。简单来说，liger grid 就是提交准备好的数据到指定的目标请求数据，拿到数据以后，显示出来。

所以问题在于发送什么数据，拿到什么数据。先来看看ligerGrid的参数：

        url: null,                          

        pageSize: 10,                        

        sortName : null,

        sortOrder:null,      

        root :'Rows',                       //数据源字段名
        record:'Total',                     //数据源记录数字段名
        pageParmName :'page',               //页索引参数名，(提交给服务器)
        pagesizeParmName:'pagesize',        //页记录数参数名，(提交给服务器)
        sortnameParmName:'sortname',        //页排序列名(提交给服务器)
        sortorderParmName:'sortorder',      //页排序方向(提交给服务器)

发送什么数据

page、pagesize、sortname、sortorder 这几个是默认发送到服务器的参数，可用于正确返回分页、排序后的数据。  如果需要查询，可能需要配置一下parms，格式如 parms:[{name:'wherestr',value:'status="active"'}] ，这样后台就可以收到这个参数了

比如我在页面上这样配置：

pageSize: 30,url: "service/BillListData.ashx?gridviewname=authors", sortName: 'au_id'

后台收到的数据，将会是：

拿到什么数据

Rows、Total这两个是返回数据的默认字段名，Rows是数据的json格式，Total是记录的总数，需要的数据类似这样的：

 效果如下：

 

二，存储过程

CREATE PROCEDURE [dbo].[P_GridViewPager] (
    @recordTotal INT OUTPUT,            --输出记录总数
    @viewName VARCHAR(800),        --表名
    @fieldName VARCHAR(800) = '*',        --查询字段
    @keyName VARCHAR(200) = 'Id',            --索引字段
    @pageSize INT = 20,                    --每页记录数
    @pageNo INT =1,                    --当前页
    @orderString VARCHAR(200),        --排序条件
    @whereString VARCHAR(800) = '1=1'        --WHERE条件
)
AS
BEGIN
     DECLARE @beginRow INT
     DECLARE @endRow INT
     DECLARE @tempLimit VARCHAR(200)
     DECLARE @tempCount NVARCHAR(1000)
     DECLARE @tempMain VARCHAR(1000)

     SET @beginRow = (@pageNo - 1) * @pageSize    + 1
     SET @endRow = @pageNo * @pageSize
     SET @tempLimit = 'rows BETWEEN ' + CAST(@beginRow AS VARCHAR) +' AND '+CAST(@endRow AS VARCHAR)
     
     --输出参数为总记录数
     SET @tempCount = 'SELECT @recordTotal = COUNT(*) FROM (SELECT '+@keyName+' FROM '+@viewName+' WHERE '+@whereString+') AS my_temp'
     EXECUTE sp_executesql @tempCount,N'@recordTotal INT OUTPUT',@recordTotal OUTPUT
       
     --主查询返回结果集
     SET @tempMain = 'SELECT * FROM (SELECT ROW_NUMBER() OVER ('+@orderString+') AS rows ,'+@fieldName+' FROM '+@viewName+' WHERE '+@whereString+') AS main_temp WHERE '+@tempLimit
     
     --PRINT @tempMain
     EXECUTE (@tempMain)
END
GO

三，准备一个通用的ashx页面

<%@ WebHandler Language="C#" Class="BillListData" %>
using System;
using System.Web; 
using ligerUI.Utility.Common;
using ligerUI.Utility.LigerGrid;
public class BillListData : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        try
        {
            TryGetGridViewData();
        }
        catch (Exception err)
        {
            context.Response.Write("null");
        }
        context.Response.End();
    }

    public void TryGetGridViewData()
    {
        System.Web.HttpContext context = System.Web.HttpContext.Current;
        GridViewPager pager = new GridViewPager();
        string datajson = pager.GetDataJSON();
        context.Response.Write(datajson); 
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}

四，实现处理方法（接收分页排序信息，并返回正确的数据）

public DataTable GetGridView(string gridViewName, string fieldName, string gridKeyName, int pageNo, int pageSize, string orderStr, string whereStr, ref int recordTotal)
        { 
            string sqlCommad = "P_GridViewPager"; 
            SqlParameter[] parms = new SqlParameter[]{
                new SqlParameter("viewName",SqlDbType.VarChar,50),
                new SqlParameter("fieldName",SqlDbType.VarChar,50),
                new SqlParameter("keyName",SqlDbType.VarChar,50),
                new SqlParameter("pageNo",SqlDbType.Int),
                new SqlParameter("pageSize",SqlDbType.Int),
                new SqlParameter("orderString",SqlDbType.VarChar,50),
                new SqlParameter("whereString",SqlDbType.VarChar,50),
                new SqlParameter("recordTotal",SqlDbType.VarChar,50)
            };
            parms[0].Value = gridViewName;
            parms[1].Value = fieldName;
            parms[2].Value = gridKeyName;
            parms[3].Value = pageNo;
            parms[4].Value = pageSize;
            parms[5].Value = orderStr;
            parms[6].Value = whereStr;
            parms[7].Direction = ParameterDirection.Output; 
            DataTable dt = SqlHelper.ExecuteDataset(DataBaseHelper.connectionstring, CommandType.StoredProcedure, sqlCommad, parms).Tables[0];
            recordTotal = CommonHelper.ObjToInt(parms[7].Value);
            return dt;
        }

public string GetDataJSON()
        {
            System.Web.HttpContext ctx = System.Web.HttpContext.Current;

            int pageno = CommonHelper.ObjToInt(ctx.Request.Params["page"]);
            int pagesize = CommonHelper.ObjToInt(ctx.Request.Params["pagesize"]);
            string sortname = CommonHelper.ObjToStr(ctx.Request.Params["sortname"]);
            string sortorder = CommonHelper.ObjToStr(ctx.Request.Params["sortorder"]);
            string gridviewname = CommonHelper.ObjToStr(ctx.Request.Params["gridviewname"]);
            string gridsearch = CommonHelper.ObjToStr(ctx.Request.Params["gridsearch"]);
            if (string.IsNullOrEmpty(gridviewname))
                throw new ArgumentNullException("Grid视图名[gridsearch]不能为空"); 
            if (pageno == 0 || pagesize == 0)
            {
                if (string.IsNullOrEmpty(sortorder) && string.IsNullOrEmpty(gridsearch))
                {
                    return GetDataJSON(gridviewname);
                }
                if(string.IsNullOrEmpty(sortorder))
                    return GetDataJSON(gridviewname, gridsearch);
                if (string.IsNullOrEmpty(gridsearch))
                    return GetDataJSONUseSQL(string.Format("select * from {0} order by {1} {2}", gridviewname, sortname, sortorder.ToLower() == "asc" ? "asc" : "desc"));
                return GetDataJSON(gridviewname, gridsearch, string.Format("order by {0} {1}", sortname, sortorder));
            }
            if (string.IsNullOrEmpty(gridsearch) && string.IsNullOrEmpty(sortname))
            {
                return GetDataJSON(gridviewname, pageno, pagesize);
            }
            if (string.IsNullOrEmpty(gridsearch) && !string.IsNullOrEmpty(sortname))
            {
                return GetDataJSON(gridviewname, pageno, pagesize, sortname, sortorder);
            }
            if (!string.IsNullOrEmpty(gridsearch) && string.IsNullOrEmpty(sortname))
            {
                return GetDataJSON(gridviewname, pageno, pagesize, gridsearch);
            }
            if (!string.IsNullOrEmpty(gridsearch) && !string.IsNullOrEmpty(sortname))
            {
                return GetDataJSON(gridviewname, pageno, pagesize, sortname, sortorder, gridsearch);
            }
            return @"{""Rows"":[],""Total"":""0""}";
        }