jquery.Ajax() method calls Asp.Net background method analysis

Using JQuery’s $.ajax() can easily call asp.net’s background methods.
Let’s warm up with a simple example first.

1. Method call without parameters
asp.net code:

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!";
}

Note: 1. The method must be a static method and must have the declaration of [WebMethod]

JQuery code:

/// <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;
    });
});

Result:

2. Method call with parameters
asp.net code:

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:

/// <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: "{&#39;str&#39;:&#39;我是&#39;,&#39;str2&#39;:&#39;XXX&#39;}",   
            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: "{&#39;str&#39;:&#39;我是&#39;,&#39;str2&#39;:&#39;XXX&#39;}",
            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;
    });
});

Running result:

Enter the advanced application below

3. Calling the method that returns an array
asp.net code:

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 :

/// <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;
    });
});

Run result:

4. Return the call of Hashtable method
asp.net code:

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:

/// <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: "{ &#39;key&#39;: &#39;haha&#39;, &#39;value&#39;: &#39;哈哈！&#39; }",   
            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: "{ &#39;key&#39;: &#39;haha&#39;, &#39;value&#39;: &#39;哈哈！&#39; }",
            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;
    });
});

Run result:

5. Operation xml
XMLtest.xml:

<?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 :

$(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   KVM 网上购物 毛刷 网站建设 北京快递公司 超声波焊接机
                $(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: &#39;xml&#39;, //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;
    });
});

[10.121.158.27:4002] Too many user code to run when -usercode_in_pthread is on

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