A simple method to directly call the asp.net background using JQuery

Using JQuery’s $.ajax() can easily call asp.net’s background methods.

[WebMethod] Namespace

1. Method call without parameters, note: 1. The method must be a static method, and it must have the declaration of [WebMethod]

Backend:

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

Frontend:

$(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;
  });
});

2. Method call with parameters

Backend:

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

Frontend:

$(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;
  });
});

3. Return array method call

Backend:

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;
}

Frontend:

$(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;
  });
});

4. Return Hashtable method call

Backend

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;
}

Front Desk:

$(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;
  });
});

5. Operation xml

XMLtest.xml:
view
 plaincopy to clipboardprint?
<?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>

Front Desk:

$(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;
  });
});