关于js调用ws

客户端 JavaScript 调用 ASP.NET WebService 的方法除了采用 WebServer.htc 和 构造 SOAPAction 的方法外，下面介绍一个采用 Ajax 调用的简单方法，并且可以传递参数。其实，ASP.NET WebService 就是一个网站，所以，Request 对象是可用的，这样，传递参数就很容易了。下面是一个WebService1.asmx的代码

ASMX 代码

<% @ WebService Language = " C# " CodeBehind = " WebService1.asmx.cs " Class = " WebService1 " %>

 

C# 代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;

   /// <summary>
   /// Summary description for WebService1
   /// </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 WebService1 : System.Web.Services.WebService
  {
    [WebMethod]
     // 字符串返回测试
     public string GetServerTime()
    {
       return " 当前服务器时间： " + DateTime.Now.ToString();
    }

    [WebMethod]
     // long 类型返回测试
     public long GetServerTimeTicks()
    {
       return DateTime.Now.Ticks;
    }

    [WebMethod]
     // Datatable返回测试
     public DataTable GetTestDataTable()
    {
      DataTable dt = new DataTable( " TestTable " );
      DataRow dr;
      dt.Columns.Add( new DataColumn( " id " , typeof (Int32)));
      dt.Columns.Add( new DataColumn( " text " , typeof ( string )));
       for ( int i = 0 ; i < 6 ; i ++ )
      {
        dr = dt.NewRow();
        dr[ 0 ] = i;
        dr[ 1 ] = " 列表项目 " + i.ToString();
        dt.Rows.Add(dr);
      }
       return dt;
    }

    [WebMethod]
     // List 类型测试
     public List < User > GetTestUser()
    {
       // 传递参数传测试
       string param = this .Context.Request.QueryString[ " param " ];
       if (param == null ) param = this .Context.Request.Form[ " param1 " ];
      List < User > u_list = new List < User > ();
       for ( int i = 0 ; i < 10 ; i ++ )
      {
        User u = new User();
        u.Name = " LoginName " + i.ToString() + " param = " + param;
        u.Title = " 孟宪会 " + i.ToString();
        u_list.Add(u);
      }
       return u_list;
    }

     // 定义一个对象 User
     public class User
    {
       public String Name { get ; set ; }
       public String Title { get ; set ; }
    }
  }

 客户端调用的代码：

HTML 代码

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
< html xmlns ="http://www.w3.org/1999/xhtml" >
< head runat ="server" >
   < title > JavaScript 调用 ASP.NET Web 服务测试 </ title >
   < script type ="text/javascript" >
     var xmlHttp = null ;
     function createXMLHttpRequest() {
       try {
         if (window.XMLHttpRequest)
          xmlHttp = new XMLHttpRequest();
         else if (window.ActiveXObject)
          xmlHttp = new ActiveXObject( " Microsoft.XMLHTTP " );
      }
       catch (ex) { }
    }

     function AsynRequest() {
      createXMLHttpRequest();
       if (xmlHttp == null ) {
        alert( " 不能创建 XmlHttpRequest 对象 " );
         return ;
      }
      xmlHttp.open( " GET " , " WebService1.asmx/GetTestUser?param=net_lover " , true );
      xmlHttp.setRequestHeader( " Connection " , " close " );
      xmlHttp.onreadystatechange = function () {
         if (xmlHttp.readyState == 4 ) {
           if (xmlHttp.status == 200 ) {
             var userList = xmlHttp.responseXML.getElementsByTagName( " User " );
             for (i = 0 ; i < userList.length; i ++ ) {
              document.getElementById( " get1 " ).innerHTML += userList[i].getElementsByTagName( " Name " )[ 0 ].firstChild.nodeValue + " ： " ;
              document.getElementById( " get1 " ).innerHTML += userList[i].getElementsByTagName( " Title " )[ 0 ].firstChild.nodeValue + " <br/> " ;
            }
          }
        }
      };
      xmlHttp.send();
    }

     function AsynPostRequest() {
      createXMLHttpRequest();
       if (xmlHttp == null ) {
        alert( " 不能创建 XmlHttpRequest 对象 " );
         return ;
      }
       var data = " param1=abc " ;
      xmlHttp.open( " POST " , " WebService1.asmx/GetTestUser?t= " + Date.parse( new Date()), true );
      xmlHttp.setRequestHeader( " Content-type " , " application/x-www-form-urlencoded " );
      xmlHttp.setRequestHeader( " Content-length " , data.length);
      xmlHttp.setRequestHeader( " Connection " , " close " );
      xmlHttp.onreadystatechange = function () {
         if (xmlHttp.readyState == 4 ) {
           if (xmlHttp.status == 200 ) {
             var userList = xmlHttp.responseXML.getElementsByTagName( " User " );
             for (i = 0 ; i < userList.length; i ++ ) {
              document.getElementById( " post1 " ).innerHTML += userList[i].getElementsByTagName( " Name " )[ 0 ].firstChild.nodeValue + " ： " ;
              document.getElementById( " post1 " ).innerHTML += userList[i].getElementsByTagName( " Title " )[ 0 ].firstChild.nodeValue + " <br/> " ;
            }
          }
        }
      };
      xmlHttp.send(data);
    }
   </ script >
</ head >
< body >
< input type ="button" value ="GET 方法调用" onclick ="AsynRequest()" />
< input type ="button" value ="POST方法调用" onclick ="AsynPostRequest()" />
< div id ="get1" ></ div >
< div id ="post1" ></ div >
</ body >
</ html >

 需要注意的是：使用此方法需要在web.config里加入以下的配置：

web.config 代码

< system.web >
   < webServices >
     < protocols >
       < add name = "HttpPost" />
       < add name = "HttpGet" />
     </ protocols >
   </ webServices >
</ system.web >

 

 

 

http://dotnet.aspx.cc/article/76a57e9c-01aa-42fd-b6aa-c96b9a63b394/read.aspx