利用JQuery的$.ajax()可以很方便的调用asp.net的后台方法

利用JQuery的$.ajax()可以很方便的调用asp.net的后台方法。

1.最常用方法

<script language="javascript">

  //添加cookie
  function AddCart_Rank(LSTR_AddedID) {
   
    if (LSTR_AddedID != "") {
        $.ajax({
          type: "POST",
          contentType: "application/json",
          url: "WebService/WSCart.asmx/AddCart",
          async: false,
          data: "{Id:'" + LSTR_AddedID + "',Type:'S'}",
          dataType: 'json',
          success: function(result) {
            if (result.d == "true") {
              alert("成功加入我的酒單");
            }
            else {
              alert("出錯了");
            }
          },
          error: function(XMLHttpRequest, textStatus, errorThrown) {
            alert("出錯了");
          }
        });
     
    }
  }
</script>

先来个简单的实例热热身吧。

1、无参数的方法调用

asp.net code：

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using System.Web.Script.Services;  

[WebMethod]  
public static string SayHello()  
{  
     return "Hello Ajax!";  
}
using System.Web.Script.Services;

[WebMethod]
public static string SayHello()
{
     return "Hello Ajax!";
}

注意：1.方法一定要静态方法，而且要有[WebMethod]的声明

JQuery code：

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/// <reference path="jquery-1.4.2-vsdoc.js"/>  
$(function() {  
    $("#btnOK").click(function() {  
        $.ajax({  
            //要用post方式  
            type: "Post",  
            //方法所在页面和方法名  
            url: "data.aspx/SayHello",  
            contentType: "application/json; charset=utf-8",  
            dataType: "json",  
            success: function(data) {  
                //返回的数据用data.d获取内容  
                alert(data.d);  
            },  
            error: function(err) {  
                alert(err);  
            }  
        });  

        //禁用按钮的提交  
        return false;  
    });  
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
    $("#btnOK").click(function() {
        $.ajax({
            //要用post方式
            type: "Post",
            //方法所在页面和方法名
            url: "data.aspx/SayHello",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(data) {
                //返回的数据用data.d获取内容
                alert(data.d);
            },
            error: function(err) {
                alert(err);
            }
        });

        //禁用按钮的提交
        return false;
    });
});

结果：

2、带参数的方法调用

asp.net code：

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using System.Web.Script.Services;  

[WebMethod]  
public static string GetStr(string str, string str2)  
{  
    return str + str2;  
}
using System.Web.Script.Services;

[WebMethod]
public static string GetStr(string str, string str2)
{
    return str + str2;
}

JQuery code：

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/// <reference path="jquery-1.4.2-vsdoc.js"/>  
$(function() {  
    $("#btnOK").click(function() {  
        $.ajax({  
            type: "Post",  
            url: "data.aspx/GetStr",  
            //方法传参的写法一定要对，str为形参的名字,str2为第二个形参的名字  
            data: "{'str':'我是','str2':'XXX'}",  
            contentType: "application/json; charset=utf-8",  
            dataType: "json",  
            success: function(data) {  
                //返回的数据用data.d获取内容  
                  alert(data.d);  
            },  
            error: function(err) {  
                alert(err);  
            }  
        });  

        //禁用按钮的提交  
        return false;  
    });  
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
    $("#btnOK").click(function() {
        $.ajax({
            type: "Post",
            url: "data.aspx/GetStr",
            //方法传参的写法一定要对，str为形参的名字,str2为第二个形参的名字
            data: "{'str':'我是','str2':'XXX'}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(data) {
                //返回的数据用data.d获取内容
                  alert(data.d);
            },
            error: function(err) {
                alert(err);
            }
        });

        //禁用按钮的提交
        return false;
    });
});

运行结果：

下面进入高级应用罗

3、返回数组方法的调用

asp.net code：

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using System.Web.Script.Services;  

[WebMethod]  
public static List<string> GetArray()  
{  
    List<string> li = new List<string>();  

    for (int i = 0; i < 10; i++)  
        li.Add(i + "");  

    return li;  
}
using System.Web.Script.Services;

[WebMethod]
public static List<string> GetArray()
{
    List<string> li = new List<string>();

    for (int i = 0; i < 10; i++)
        li.Add(i + "");

    return li;
}

JQuery code：

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/// <reference path="jquery-1.4.2-vsdoc.js"/>  
$(function() {  
    $("#btnOK").click(function() {  
        $.ajax({  
            type: "Post",  
            url: "data.aspx/GetArray",  
            contentType: "application/json; charset=utf-8",  
            dataType: "json",  
            success: function(data) {  
                //插入前先清空ul  
                $("#list").html("");  

                //递归获取数据  
                $(data.d).each(function() {  
                    //插入结果到li里面  
                    $("#list").append("<li>" + this + "</li>");  
                });  

                alert(data.d);  
            },  
            error: function(err) {  
                alert(err);  
            }  
        });  

        //禁用按钮的提交  
        return false;  
    });  
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
    $("#btnOK").click(function() {
        $.ajax({
            type: "Post",
            url: "data.aspx/GetArray",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(data) {
                //插入前先清空ul
                $("#list").html("");

                //递归获取数据
                $(data.d).each(function() {
                    //插入结果到li里面
                    $("#list").append("<li>" + this + "</li>");
                });

                alert(data.d);
            },
            error: function(err) {
                alert(err);
            }
        });

        //禁用按钮的提交
        return false;
    });
});

运行结果：

4、返回Hashtable方法的调用

asp.net code：

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using System.Web.Script.Services;  
using System.Collections;  

[WebMethod]  
public static Hashtable GetHash(string key,string value)  
{  
    Hashtable hs = new Hashtable();  

    hs.Add("www", "yahooooooo");  
    hs.Add(key, value);  
      
    return hs;  
}
using System.Web.Script.Services;
using System.Collections;

[WebMethod]
public static Hashtable GetHash(string key,string value)
{
    Hashtable hs = new Hashtable();

    hs.Add("www", "yahooooooo");
    hs.Add(key, value);
   
    return hs;
}

JQuery code：

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/// <reference path="jquery-1.4.2-vsdoc.js"/>  
$(function() {  
    $("#btnOK").click(function() {  
        $.ajax({  
            type: "Post",  
            url: "data.aspx/GetHash",  
            //记得加双引号 T_T  
            data: "{ 'key': 'haha', 'value': '哈哈！' }",  
            contentType: "application/json; charset=utf-8",  
            dataType: "json",  
            success: function(data) {  
                alert("key: haha ==> "+data.d["haha"]+"\n key: www ==> "+data.d["www"]);  
            },  
            error: function(err) {  
                alert(err + "err");  
            }  
        });  

        //禁用按钮的提交  
        return false;  
    });  
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
    $("#btnOK").click(function() {
        $.ajax({
            type: "Post",
            url: "data.aspx/GetHash",
            //记得加双引号 T_T
            data: "{ 'key': 'haha', 'value': '哈哈！' }",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(data) {
                alert("key: haha ==> "+data.d["haha"]+"\n key: www ==> "+data.d["www"]);
            },
            error: function(err) {
                alert(err + "err");
            }
        });

        //禁用按钮的提交
        return false;
    });
});

运行结果：

5、操作xml

XMLtest.xml:

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<?xml version="1.0" encoding="utf-8" ?>
<data>
<item>
    <id>1</id>
    <name>qwe</name>
</item>
<item>
    <id>2</id>
    <name>asd</name>
</item>
</data>
<?xml version="1.0" encoding="utf-8" ?>
<data>
<item>
    <id>1</id>
    <name>qwe</name>
</item>
<item>
    <id>2</id>
    <name>asd</name>
</item>
</data>

JQuery code:

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$(function() {  
    $("#btnOK").click(function() {  
        $.ajax({  
            url: "XMLtest.xml",  
            dataType: 'xml', //返回的类型为XML ，和前面的Json，不一样了  
            success: function(xml) {  
                //清空list  
                $("#list").html("");  
                //查找xml元素
                $(xml).find("data>item").each(function() {  
                    $("#list").append("<li>id:" + $(this).find("id").text() +"</li>");  
                    $("#list").append("<li>Name:"+ $(this).find("name").text() + "</li>");  
                })  
            },  
            error: function(result, status) { //如果没有上面的捕获出错会执行这里的回调函数  
                alert(status);  
            }  
        });  

        //禁用按钮的提交  
        return false;  
    });  
});
$(function() {
    $("#btnOK").click(function() {
        $.ajax({
            url: "XMLtest.xml",
            dataType: 'xml', //返回的类型为XML ，和前面的Json，不一样了
            success: function(xml) {
                //清空list
                $("#list").html("");
                //查找xml元素
                $(xml).find("data>item").each(function() {
                    $("#list").append("<li>id:" + $(this).find("id").text() +"</li>");
                    $("#list").append("<li>Name:"+ $(this).find("name").text() + "</li>");
                })
            },
            error: function(result, status) { //如果没有上面的捕获出错会执行这里的回调函数
                alert(status);
            }
        });

        //禁用按钮的提交
        return false;
    });
});