JqGrid+json完整示例

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真没找到这样的例子，于是自已写了个，分享出来。

第一步，首先在WebService上，添加[System.Web.Script.Services.ScriptService]属性标签，让WebServer支持JSON.

namespace jqGrid_JSON_WebService_Sample.Services{    /// <summary>    /// Summary description for WebServiceGrid    /// </summary>    [WebService(Namespace = "http://tempuri.org/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]    [System.ComponentModel.ToolboxItem(false)]    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.     [System.Web.Script.Services.ScriptService]    public class WebServiceGrid : System.Web.Services.WebService    {    }}

接着，添加ajax调用的后端代码，获取数据，返回JSON对象:

        [WebMethod]        public object Grid(bool? _search, string nd, int page, int rows, string sidx, string sord, string searchField, string searchString, string searchOper)        {            int count;            var data = dc.Query<Issue>(string.IsNullOrWhiteSpace(searchField) ? null : new string[] { searchField }, new string[] { searchOper }, new object[] { searchString }, null, new string[] { string.IsNullOrWhiteSpace(sidx) ? "IssueID" : sidx }, new string[] { sord }, (page - 1) * rows, rows, out count);            return (new            {                total = Math.Ceiling((float)count / (float)rows),                page = page,                records = count,                rows = data.Select(item => new { id = item.IssueID, cell = new object[] { item.IssueID, item.Title, item.Description, item.Progress, item.CreateTime, item.Locked } })            });        }

第二步，添加前台页面，首先添加各种的js,css引用，然后添加jqGrid所需的<div>和js代码：

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="WebFormGrid.aspx.cs" Inherits="jqGrid_JSON_WebService_Sample.WebFormGrid" %><asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">    <link href="/Content/smoothness/jquery-ui-1.8.17.custom.css" rel="stylesheet" type="text/css" />    <link href="/Content/Site.css" rel="stylesheet" type="text/css" />    <script src="/Scripts/jquery-1.7.1.min.js" type="text/javascript"></script>    <script src="/Scripts/jquery-ui-1.8.11.min.js" type="text/javascript"></script>    <link href="/Content/ui.jqgrid.css" rel="stylesheet" type="text/css" />    <script src="/Scripts/i18n/grid.locale-en.js" type="text/javascript"></script>    <script src="/Scripts/jquery.jqGrid.min.js" type="text/javascript"></script>    <script type="text/javascript">        $(function ()        {            $("#list #grid").jqGrid(            {                url: '/Services/WebServiceGrid.asmx/Grid',                mtype: 'POST',                ajaxGridOptions: { contentType: 'application/json; charset=utf-8' },                serializeGridData: function (postData)                {                    if (postData.searchField === undefined) postData.searchField = null;                    if (postData.searchString === undefined) postData.searchString = null;                    if (postData.searchOper === undefined) postData.searchOper = null;                    return JSON.stringify(postData);                },                jsonReader:                {                    root: "d.rows",                    page: "d.page",                    total: "d.total",                    records: "d.records"                },                datatype: "json",                colNames:                [                    'IssueID',                    'Title',                    'Description',                    'Progress',                    'CreateTime',                    'Locked'                ],                colModel:                [                    { name: 'IssueID', width: 100, index: 'IssueID' },                    { name: 'Title', width: 100, index: 'Title' },                    { name: 'Description', width: 300, index: 'Description' },                    { name: 'Progress', width: 150, index: 'Progress' },                    { name: 'CreateTime', width: 100, index: 'CreateTime', formatter:'date',  sorttype:'datetime', datefmt:'M d h:i' },                    { name: 'Locked', width: 100, index: 'Locked' }                ],                rowNum: 10,                rowList: [10, 15, 20, 25, 40],                pager: '#pager',                viewrecords: true,                sortorder: "desc",                width: 900,                height: 240,            });            $("#list #grid").jqGrid('navGrid', '#pager', { edit: false, add: false, del: false });        });</script></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">    <div id="list">    <table id="grid">    </table>    <div id="pager">    </div></asp:Content>

注意jqGrid函数据前面的部分代码：

                url: '/Services/WebServiceGrid.asmx/Grid',                mtype: 'POST',                ajaxGridOptions: { contentType: 'application/json; charset=utf-8' },

通过url指定WebService方法，mtype指定使用POST方法，contentType指定为json，这样WebService才会返回json对象。

可是，返回的数据是放在一个属性名为d的对象里，所以还要添加 jsonReader，来作数据映射:

 jsonReader:                {                    root: "d.rows",                    page: "d.page",                    total: "d.total",                    records: "d.records"                },

最后，为了保证查询时能够POST正确的参数，还要对POST的参数值进行检查：

                serializeGridData: function (postData)                {                    if (postData.searchField === undefined) postData.searchField = null;                    if (postData.searchString === undefined) postData.searchString = null;                    if (postData.searchOper === undefined) postData.searchOper = null;                    return JSON.stringify(postData);                },

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