jQuery带参数的ajax调用WebService

在调试jQuery带参数的ajax调用WebService的时候，被参数的问题搞了一下，问题是这样的：

首先在服务器端(C#, .NET2.0)定义了一个WebService, 里面有两个方法，其中一个返回：List<Person> GetPersonList(string input), 返回的是自定义的集合。

WebService代码如下：

   1: using System;

   2: using System.Collections.Generic;

   3: using System.Collections.ObjectModel;

   4: using System.Web;

   5: using System.Collections;

   6: using System.Web.Services;

   7: using System.Web.Services.Protocols;

   8:  

   9: [WebService(Namespace = "http://semenoff.dk/")]

  10: [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

  11: [System.Web.Script.Services.ScriptService()]

  12: public class MySampleService : System.Web.Services.WebService

  13: {

  14:     public MySampleService()

  15:     {

  16:         //Uncomment the following line if using designed components 

  17:         //InitializeComponent(); 

  18:     }

  19:  

  20:     [WebMethod]

  21:     public string GetServerResponse(string callerName)

  22:     {

  23:         if(callerName== string.Empty)

  24:             throw new Exception("Web Service Exception: invalid argument");

  25:  

  26:         return string.Format("Service responded to {0} at {1}", callerName, DateTime.Now.ToString());

  27:     }

  28:  

  29:     

  30:     [WebMethod]

  31:     public List<Person> GetPersonList(string input)

  32:     {

  33:         List<Person> ret = new List<Person>();

  34:  

  35:         Person p = new Person();

  36:         p.ID = "001";

  37:         p.Value = "Jason Hu";

  38:  

  39:         ret.Add(p);

  40:  

  41:         p = new Person();

  42:         p.ID = "002";

  43:         p.Value = "Thomas Li";

  44:  

  45:         ret.Add(p);

  46:  

  47:         //System.Web.Script.Serialization.JavaScriptSerializer json = new System.Web.Script.Serialization.JavaScriptSerializer();

  48:         //return json.Serialize(ret);

  49:  

  50:         return ret;

  51:     }

  52:  

  53: }

  54:  

  55: public class Person

  56: {

  57:     public string ID { get; set; }

  58:     public string Value { get; set; }

  59: }

  60:  

客户端jQuery用ajax调用这个WebService，其中jQuery的ajax的data参数是常量可以：

   1: $.ajax({

   2:         type: "POST",

   3:         contentType: "application/json",

   4:         url: "./WebServices/MySampleService.asmx/GetServerResponse",

   5:         data:"{input:56}", // ************* 常量 ******************

   6:         dataType: 'json',

   7:         success: function(result) {

   8:           alert("jQuery callback: " + result);

   9:         },

  10:         error: function(){

  11:           alert("Error occured.");

  12:         } 

  13:      });

但jQuery的ajax的data参数是变量写成这样就不行：

   1: $.ajax({

   2:         type: "POST",

   3:         contentType: "application/json",

   4:         url: "./WebServices/MySampleService.asmx/GetServerResponse",

   5:         data:"{input:" + user + "}", //******* 此处错，回调Error****************

   6:         dataType: 'json',

   7:         success: function(result) {

   8:           alert("jQuery callback: " + result);

   9:         },

  10:         error: function(){

  11:           alert("Error occured.");

  12:         } 

  13:      });

最后继续折腾加个单引号，写成这样data:'{"callerName":"'+user+'"}' 就没问题了：

   1: /// <reference src="jquery-1.3.2.js"/>

   2:  

   3: var MyNameSpace = MyNameSpace || {};

   4: MyNameSpace.Auth={};

   5:  

   6: MyNameSpace.Auth.TestJQuery = function(user)

   7: {

   8:     $.ajax({

   9:         type: "POST",

  10:         contentType: "application/json",

  11:         url: "./WebServices/MySampleService.asmx/GetServerResponse",

  12:         data:'{"callerName":"'+user+'"}', //注意格式！！"{callerName:abc}",可以，但 "{callerName:"+user+"}"不行，Error!

  13:         dataType: 'json',

  14:         success: function(result) {

  15:           alert("jQuery callback: " + result);

  16:         },

  17:         error: function(){

  18:           alert("Error occured.");

  19:         } 

  20:      });

  21:  

  22:       $.ajax({

  23:                 type: "POST",

  24:                 contentType: "application/json",

  25:                 url: "./WebServices/MySampleService.asmx/GetPersonList",

  26:                 data: '{"input":"'+user+'"}', ////注意格式！"{input:56}",可以，但 "{input:"+user+"}"不行，Error!

  27:                 dataType: 'json',

  28: //                beforeSend: function(){

  29: //                    $("#tipsDiv").show();

  30: //                    $("#tipsDivGT").text("Searching.... please wait");

  31: //                  }, 

  32: //                error: function(){

  33: //                    $("#tipsDivGT").text("Error occured!!");

  34: //                  }, 

  35:                 success: function(result) {

  36:                      

  37:                         //$('#dictionary').append(this.toString() + " ");

  38:                        // alert(result.join(" | "));

  39:                        

  40:                      $(result).each(function() {

  41:                        alert(this['ID'] + " " + this['Value']);

  42:                     });

  43:  

  44:                 }

  45:             });

  46: }

  47:  

  48: $(function() {

  49:     $("#btnTest").click(function() {

  50:         MyNameSpace.Auth.TestJQuery( $("#tbUserName").attr("value") );

  51:     });

  52:  

  53:   }

  54:  

  55: );

其中参数的值如果含有双引号，就会报错，例如：

data:'{"callerName":"'+user+'"}'

如果user的值是 <a href="http://www.abc.com">Some value</a>

就会报错，解决办法是双引号转义，把 " 变成 \"：user换成：user.replace(/\"/ig, "\\\"")

立此存照希望对被同样小问题困扰的同学有用！