ASP.NET使用EasyUI-DataGrid + ashx + JQuery Ajax：实现数据的增删查改，查询和分页！

转自：http://www.cnblogs.com/lt-style/p/3457399.html

数据表：

学生表：学生编号、姓名、性别、班级编号、年龄

班级表：班级编号、班级名称

开发过程：

1.下载EasyUI的开发包

2.引用相关文件：

<link href="/CSS/easyui.css" rel="stylesheet" type="text/css" />
    <link href="/CSS/demo.css" rel="stylesheet" type="text/css" />
    <link href="/CSS/icon.css" rel="stylesheet" type="text/css" />
    <script src="/Packages/jquery-1.6.4.min.js" type="text/javascript"></script>
    <script src="/Packages/jquery.easyui.min.js" type="text/javascript"></script>
    <script src="/Packages/EditStuInfo.js" type="text/javascript"></script>
    <script src="/Packages/easyui-lang-zh_CN.js" type="text/javascript"></script>

3.引用相关图片文件：

要注意的是Css文件中的图片路路径，如果是使用默认的路径，那么图片文件应该放在css所在文件的同级目录，如果是其它目录，则要修改css中的图片路径

4.建立表格、对话框、及按钮：

<!--Search Begin-->
    根据班级查询学生信息：
    <select id="classNum_Search"></select>&nbsp;&nbsp;
    <a href="#" class="easyui-linkbutton" onclick="searchStuByClassNum()">查询</a>
    <br />
    <!--Search End-->

    <!--StuInfo_Table Begin-->
    <table id="dg" title="学生信息管理" class="easyui-datagrid" style="700px;height:365px"
            url="/ashx/StudentInfo.ashx?Action=Load"
            toolbar="#toolbar" pagination="true"
            rownumbers="true" fitColumns="true" singleSelect="true">
        <thead>
            <tr>
                <th field="Id" width="50">ID</th>
                <th field="StuNum" width="50">学生编号</th>
                <th field="StuName" width="50">姓名</th>
                <th field="ClasName" width="50">班级</th>
                <th field="StuGender" width="50">性别</th>
                <th field="StuAge" width="50">年龄</th>
            </tr>
        </thead>
    </table>
    <div id="toolbar">
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="newUser()">添加</a>
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-edit" plain="true" onclick="editUser()">编辑</a>
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-remove" plain="true" onclick="destroyUser()">删除</a>
    </div>
    <!--StuInfo_Table End-->

    <!--StuInfo_Dialog Begin-->
    <div id="dlg" class="easyui-dialog" style="400px;height:280px;padding:10px 20px"
            closed="true" buttons="#dlg-buttons">
        <div class="ftitle">学生信息</div>
        <form id="fm" method="post" novalidate action="">
            <div class="fitem">
                <label>学生编号:</label>
                <input name="StuNum" class="easyui-validatebox"/>
            </div>
            <div class="fitem">
                <label>姓名:</label>
                <input name="StuName" class="easyui-validatebox" required="true"/>
            </div>
            <div class="fitem">
                <label>班级:</label>
                <select name="ClassNum" id="ClassNum" ></select>
            </div>
            <div class="fitem">
                <label>性别:</label>
                <input id="rdoMan" name="StuGender" type="radio" value="1" />男
                <input id="rdoWuman" name="StuGender" type="radio" value="0" />女
            </div>
            <div class="fitem">
                <label>年龄:</label>
                <input name="StuAge" class="easyui-validatebox" required="true" />
            </div>
        </form>
    </div>
    <!--StuInfo_Dialog End-->

    <div id="dlg-buttons">
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-ok" onclick="saveUser()">保存</a>
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-cancel" onclick="javascript:$('#dlg').dialog('close')">取消</a>
    </div>
</div>

5.对数据操作的JS代码：

var url;

//添加
function newUser() {
    $('#dlg').dialog('open').dialog('setTitle', '添加学生信息');
    $('#fm').form('clear');

    //获取最大的学生ID并加1
    $.get("/ashx/StudentInfo.ashx?Action=GetMaxNum", function (data) {
        $("#fm input[name='StuNum']").val(data).attr("readonly", "readonly");
    });

    //获取班级信息
    $.get("/ashx/StudentInfo.ashx?Action=GetClassInfo", function (data) {
        $("#ClassNum").html("").append(data);
        $("#ClassNum").eq(0).attr("selected", "selected");
    });

    //默认性别男被选中
    $("#fm input[name='StuGender']").eq(0).attr("checked", "checked");

    url = '/ashx/StudentInfo.ashx?Action=Save';
}

//更新
function editUser() {
    var row = $('#dg').datagrid('getSelected');
    if (row) {
        $('#dlg').dialog('open').dialog('setTitle', '编辑学生信息');
        $('#fm').form('load', row);

        //获取和设置班级的状态
        $.get("/ashx/StudentInfo.ashx?Action=GetClassInfo", function (data) {
            $("#ClassNum").html("").append(data);
            $("#ClassNum option").each(function () {
                if ($(this).text() == row.ClasName) {
                    $(this).attr("selected", "selected");
                }
            });

            //.eq(0).attr("selected", "selected");
        });

        //获取和设置性别的选中状态
        if (row.StuGender == "男") {
            $("#fm input[name='StuGender']").eq(0).attr("checked", "checked");
        }
        else {
            $("#fm input[name='StuGender']").eq(1).attr("checked", "checked");
        }
        url = '/ashx/StudentInfo.ashx?Action=Update&id=' + row.Id;

    }
}

//保存
function saveUser() {
    $('#fm').form('submit', {
        url: url,
        onSubmit: function () {
            return $(this).form('validate');
        },
        success: function (result) {
            if (result == "False") {
                $.messager.show({
                    title: '友情提示',
                    msg: 'Sorry, 出错了,请重试 :('
                });
            } else {
                $('#dlg').dialog('close');        // close the dialog
                $('#dg').datagrid('reload');    // reload the user data
            }
        }
    });
}

//删除
function destroyUser() {
    var row = $('#dg').datagrid('getSelected');
    if (row) {
        $.messager.confirm('友情提示', '确定要删除数据吗，删除后将无法找回?', function (r) {
            if (r) {
                $.post('/ashx/StudentInfo.ashx', { "Action": "Delete", "id": row.Id }, function (result) {
                    if (result == "True") {
                        $('#dg').datagrid('reload');    // reload the user data
                    } else {
                        $.messager.show({    // show error message
                            title: '错误提示！',
                            msg: "服务器错误，请刷新重试 :("
                        });
                    }
                });
            }
        });
    }
}

//根据班级查询学生信息
function searchStuByClassNum() {
    var classNum = $("#classNum_Search").val();
    $('#dg').datagrid({
        url: "/ashx/StudentInfo.ashx?Action=SearchStu",
        queryParams: { "classNum": classNum }
    })
};

//加载班级信息到查询列表中
$(function () {
    $.get("/ashx/StudentInfo.ashx?Action=GetClassInfo", function (data) {
        $("#classNum_Search").html("").append(data);
        $("#classNum_Search option").eq(0).attr("selected", "selected");
    });
})

6.后台数据处理文件 ashx

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Configuration;
using System.Text;

namespace TestStuMS.Ashx
{
    /// <summary>
    /// StudentInfo 的摘要说明
    /// </summary>
    public class StudentInfo : IHttpHandler
    {
       public BLL.Students bllStu = new BLL.Students();
       public BLL.StuClass bllClass = new BLL.StuClass();

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            
            //获取请求的动作
            string action = context.Request["Action"];
            if (string.IsNullOrEmpty(action)) return;

            switch (action)
            {
                case "Save"://添加
                    context.Response.Write(AddStuInfo(context));
                    break;
                case "Delete"://删除
                    context.Response.Write(DeleteStuInfo(context));
                    break;
                case "Update"://更新
                    context.Response.Write(UpdateStuInfo(context));
                    break;
                case "Load"://加载与分页
                    context.Response.Write(BuildPager(context));
                    break;
                case "GetMaxNum"://获取新学生编号
                    context.Response.Write(GetMaxNum()+1);
                    break;
                case "GetClassInfo"://获取班级信息
                    context.Response.Write(GetClassInfo(context));
                    break;
                case "SearchStu"://根据班级获取学生信息
                    context.Response.Write(GetStuInfoByClassNum(context));
                    break;
            }

        }

        #region 方法

        //添加
        private bool AddStuInfo(HttpContext context)
        {
            //stuNum:1201009
            //stuName:星期三
            //classNum:1201
            //stuGender:男
            //stuAge:20

            Model.Students model= new Model.Students();
            model.StuNum = int.Parse(context.Request["StuNum"]);
            model.ClassNum = int.Parse(context.Request["ClassNum"]);
            model.StuName = context.Request["StuName"];
            model.StuGender = context.Request["StuGender"]=="1"?true:false;
            model.StuAge = int.Parse(context.Request["StuAge"]);

            return bllStu.Add(model);//如果是成功则返回True否则返回False
        }

        //更新
        private bool UpdateStuInfo(HttpContext context)
        {
            Model.Students model = new Model.Students();
            model.Id = int.Parse(context.Request["id"]);
            model.StuNum = int.Parse(context.Request["StuNum"]);
            model.ClassNum = int.Parse(context.Request["ClassNum"]);
            model.StuName = context.Request["StuName"];
            model.StuGender = context.Request["StuGender"] == "1" ? true : false;
            model.StuAge = int.Parse(context.Request["StuAge"]);

            return bllStu.Update(model);
        }

        //删除
        private bool DeleteStuInfo(HttpContext context)
        {
            int Id = int.Parse(context.Request["id"]);
            return bllStu.Delete(Id);
        }

        //分页
        private string BuildPager(HttpContext context)
        {
            int pageIndex = int.Parse(context.Request["page"]);
            int pageSize = int.Parse(context.Request["rows"]);

            List<Model.Students> stuList = bllStu.GetModelList("");
            List<Model.StuClass> classList = bllClass.GetModelList("");

            //获取学生信息
            var stuInfo = stuList.Join(classList,
                s => s.ClassNum,
                c => c.ClassNum,
                (s, c) => new { s.Id, s.StuNum, s.StuName, c.ClasName, StuGender = s.StuGender == true ? "男" : "女", s.StuAge }
                );

            //查询分页数据
            var pageData = stuInfo.Where(s => s.Id > 0)
                .OrderByDescending(s => s.Id)
                .Skip((pageIndex-1) * pageSize)
                .Take(pageSize).ToList();

            var data = new { total = stuInfo.Count(), rows = pageData };

            //序列化成JSON格式数据
            System.Web.Script.Serialization.JavaScriptSerializer jss = new System.Web.Script.Serialization.JavaScriptSerializer();

            return jss.Serialize(data);


        }

        //获取班级信息
        private string GetClassInfo(HttpContext context)
        {
           List< Model.StuClass> classList =  bllClass.GetModelList("");
           StringBuilder sb = new StringBuilder();

           foreach (var stuClass in classList)
           {
               sb.Append("<option value='" + stuClass.ClassNum + "'>" + stuClass.ClasName + "</option>");
           }

           return sb.ToString();
        }

        //获取学生最大ID(以便新添加的ID保持唯一)
        private int GetMaxNum()
        {
           return bllStu.GetMaxStuNum();
        }

        //根据班级获取学生信息
        private string GetStuInfoByClassNum(HttpContext context)
        { 
            int classNum = int.Parse(context.Request["classNum"]);

            List<Model.Students> stuList = bllStu.GetModelList("ClassNum=" + classNum);
            List<Model.StuClass> classList = bllClass.GetModelList("");

            //根据班级获取学生信息
            var stuInfo = stuList.Join(classList,
                s => s.ClassNum,
                c => c.ClassNum,
                (s, c) => new {s.ClassNum, s.Id, s.StuNum, s.StuName, c.ClasName, StuGender = s.StuGender == true ? "男" : "女", s.StuAge }
                ).Where(i=>i.ClassNum==classNum);

            //序列化成JSON格式数据
            System.Web.Script.Serialization.JavaScriptSerializer jss = new System.Web.Script.Serialization.JavaScriptSerializer();

            return jss.Serialize(stuInfo.ToList());

        }

        #endregion

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

7.效果图：