dhl:AjaxPro的使用后感

为了改维 www.pingco.com的联动效果，费了半天劲。使用AjaxPro2.dll 注意点：

1. web.config 检查是否有：必须有Ajax接管httpHandlers

<httpHandlers>
     <add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
    </httpHandlers>

 2.在。cs中注册AjaxPro

 public partial class _Default : System.Web.UI.Page
    {

 protected void Page_Load(object sender, EventArgs e)
        {

　　　　　　AjaxPro.Utility.RegisterTypeForAjax(typeof(_Default)); //注册ajaxPro,括号中的参数是当前的类名

　　　　　　 if (!Page.IsPostBack)
            {
                //---------------------------------------------------------------------------
                this.DropDownList1.DataSource = getMobileType();
                this.DropDownList1.DataTextField = "MobileFactory";
                this.DropDownList1.DataValueField = "MobileFactory";
                this.DropDownList1.DataBind();
                this.DropDownList1.Items.Insert(0, "-请选择手机品牌-");
                this.DropDownList3.Items.Insert(0, "-请选择手机型号-");
                this.DropDownList1.Attributes.Add("onchange", "mobileResult();");

}

}

/// <summary>
        /// 获取手机类型
        /// </summary>
        /// <returns></returns>
        public static DataTable getMobileType()
        {
            webcode.Data.SqlConn conn = new webcode.Data.SqlConn(System.Configuration.ConfigurationManager.AppSettings["ConnStr_Mobile"].ToString());
            string cmdText = "select distinct(MobileFactory) from T***";
            DataTable dt = conn.getDateTable(cmdText);
            return dt;
        }
        /// <summary>
        /// 获取手机型号
        /// </summary>
        /// <returns></returns>
        //[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]//todo: 测试用
        [AjaxPro.AjaxMethod]
        public DataTable getMobileTypeNumber1(string MobileFactory)
        {
            string cmdText = "select distinct(MobileType) as MobileType, max(WapVersion) as WapVersion from T***  with(nolock) where MobileFactory='" + MobileFactory + "' group by MobileType order by MobileType desc";
            webcode.Data.SqlConn conn = new webcode.Data.SqlConn(System.Configuration.ConfigurationManager.AppSettings["ConnStr_Mobile"].ToString());

            DataTable dt = conn.getDateTable(cmdText);
            return dt;
        }

}

3.前台html代码：

<script language="javascript">            
            function mobileResult()
            {            
                var m=document.getElementById("DropDownList1");               
                PingCoWeb._Default.getMobileTypeNumber1(m.value,mobileResult_callback);
            }
           
            function mobileResult_callback(response)
            {
                if (response.value != null)
                { 
                    document.getElementById("DropDownList3").length=0;　　　　           
　　　　            var ds = response.value;
                    if(ds != null && typeof(ds) == "object" && ds != null)
                    {                   
                        for(var i=0; i<ds.Rows.length; i++)
　　　　                {
　　　　                    var name=ds.Rows[i].MobileType;
　　　　　　                var id=ds.Rows[i].WapVersion;
　　　　　　                document.all("DropDownList3").options.add(new Option(name,id));
　　　　                }
                    }
                } 
                return
            }          
</script>

在此一定要注意：PingCoWeb._Default.getMobileTypeNumber1(m.value,mobileResult_callback);
不能写成：_Default.getMobileTypeNumber1(m.value,mobileResult_callback);

否则会报js错误："_Default” 未定义。 因为

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="PingCoWeb._Default"
    EnableEventValidation="false" %>

如果在类文件中定义getMobileTypeNumber1（）函数，js中也要写上完整的类（加上命名空间。）

比如写到：PingCo.Origin.Web.Helper.AdvertiseDownLoad 下：

namespace PingCo.Origin.Web.Helper
{
    public class AdvertiseDownLoad
    {
        /// <summary>
        /// 获取手机型号
        /// </summary>
        /// <returns></returns>
        //[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]//todo: 测试用
        [AjaxPro.AjaxMethod]
        public DataTable getMobileTypeNumber1(string MobileFactory)
        {
            string cmdText = "select distinct(MobileType) as MobileType, max(WapVersion) as WapVersion from **  group by MobileType order by MobileType desc";
            webcode.Data.SqlConn conn = new webcode.Data.SqlConn(System.Configuration.ConfigurationManager.AppSettings["ConnStr_Mobile"].ToString());

            DataTable dt = conn.getDateTable(cmdText);
            return dt;
        }
    }
}

cs中注册为：

AjaxPro.Utility.RegisterTypeForAjax(typeof(AdvertiseDownLoad)); //注册ajaxPro,括号中的参数是当前的类名

js中就的写：PingCo.Origin.Web.Helper.AdvertiseDownLoad.getMobileTypeNumber1(m.value,mobileResult_callback);

【附录】

:【AjaxPro实现机制浅析一】AjaxPro内部为我们做什么工作？

正文:

先找个借口：好早就想分析下AjaxPro的代码实现机制了，一直苦于没时间，现在嘛总算有那么丁点了，开篇了，慢慢分析……

以一个最简单的例子开始：
点击一个客户端button，触发一个javascript函数，执行一个只有一个string参数的服务端方法，返回一个处理过的string，处理方法是将传入的string变成“Hi”+string +“！”；够简单了，为了是不希望罗嗦的代码影响简单的分析；
所有代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Test.aspx.cs" Inherits="Test" %>

<!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>无标题页</title>
    <script type="text/javascript">
    
    function doTest()
    {
        AJAXDemo.Examples.Test.TestMethod.GetTest("AjaxPro",doTest_callback);
    }

    function doTest_callback(res) {
        alert(res.value);
    }
   
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Button1" type="button" onclick="doTest()" value="测试"/></div>
    </form>
</body>
</html>
Test.aspx.cs
public partial class Test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Utility.RegisterTypeForAjax(typeof(AJAXDemo.Examples.Test.TestMethod));
    }
}
AJAXDemo.Examples.Test
using System;
using AjaxPro;

namespace AJAXDemo.Examples.Test
{
    public class TestMethod
    {
        public TestMethod()
        {}

        [AjaxMethod]
        public string GetTest(string testText)
        {
            return "Hi," + testText + "!";
        }
    }
}
1.首先我们看AjaxPro在页面上给我们生成了什么？
Test[1]
<!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><title>
    无标题页
</title>
    <script type="text/javascript">
    
    function doTest()
    {
        AJAXDemo.Examples.Test.TestMethod.GetTest("AjaxPro",doTest_callback);
    }

    function doTest_callback(res) {
        alert(res.value);
    }
   
    </script>
</head>
<body>
    <form name="form1" method="post" action="Test.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNzgzNDMwNTMzZGRFekXifzWDNb+qFWPbJumdlZh/dQ==" />
</div>

<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/prototype.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/core.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/converter.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/AJAXDemo.Examples.Test.TestMethod,App_Code.un7rskvh.ashx"></script>

    <div>
        <input id="Button1" type="button" onclick="doTest()" value="测试"/></div>
    </form>
</body>
</html>
一定要注意这几行
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/prototype.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/core.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/converter.ashx"></script>
<script type="text/javascript" src="/AJAXDemo.2/ajaxpro/AJAXDemo.Examples.Test.TestMethod,App_Code.urx4hqkg.ashx"></script>
通过使用http://localhost:3578/AJAXDemo.2/ajaxpro/prototype.ashx和http://localhost:3578/AJAXDemo.2/ajaxpro/core.ashx不难发现，其中前面两个是源代码中带的两个js文件（core.js和prototype.js）转化出来的，基本内容也跟原来的文件一样，而converter.ashx和AJAXDemo.Examples.Test.TestMethod,App_Code.urx4hqkg.ashx里面有什么呢？看下面：
AJAXDemo.Examples.Test.TestMethod,App_Code.urx4hqkg.ashx
addNamespace("AJAXDemo.Examples.Test");
AJAXDemo.Examples.Test.TestMethod_class = Class.create();
AJAXDemo.Examples.Test.TestMethod_class.prototype = (new AjaxPro.AjaxClass()).extend({
    GetTest: function(testText) {
        return this.invoke("GetTest", {"testText":testText}, this.GetTest.getArguments().slice(1));
    },
    initialize: function() {
        this.url = '/AJAXDemo.2/ajaxpro/AJAXDemo.Examples.Test.TestMethod,App_Code.un7rskvh.ashx';
    }
});
AJAXDemo.Examples.Test.TestMethod = new AJAXDemo.Examples.Test.TestMethod_class();
converter.ashx 
 

addNamespace("Ajax.Web");

Ajax.Web.NameValueCollection = function()
{
    this.__type = "System.Collections.Specialized.NameValueCollection";

    this.add = function(key, value) {
        if(this[key] == null) {
            this[key] = value;
        }
    }
   
    this.getKeys = function() {
        var keys = [];
       
        for(key in this)
            if(typeof this[key] != "function")
                keys.push(key);
           
        return keys;
    }
   
    this.getValue = function(key) {
        return this[key];
    }
   
    this.toJSON = function() {
        var o = this;
        o.toJSON = null;
        delete o.toJSON;
        return AjaxPro.toJSON(o);
    }
}

 

addNamespace("Ajax.Web");

Ajax.Web.DataTable = function(columns, rows) {

    this.__type = "System.Data.DataTable, System.Data";
    this.Columns = new Array();
    this.Rows = new Array();

    this.addColumn = function(name, type) {
        var c = new Object();
        c.Name = name;
        c.__type = type;
       
        this.Columns.push(c);
    }

    this.toJSON = function() {
        var dt = new Object();

        dt.Columns = [];
        for(var i=0; i<this.Columns.length; i++)
            dt.Columns.push([this.Columns[i].Name, this.Columns[i].__type]);

        dt.Rows = [];
        for(var i=0; i<this.Rows.length; i++) {
            var row = [];
            for(var j=0; j<this.Columns.length; j++)
                row.push(this.Rows[i][this.Columns[j].Name]);
            dt.Rows.push(row);
        }

        return AjaxPro.toJSON(dt);
    }

    this.addRow = function(row) {
        this.Rows.push(row);
    }

    if(columns != null) {
        for(var i=0; i<columns.length; i++) {
            this.addColumn(columns[i][0], columns[i][1]);
        }
    }

    if(rows != null) {
        for(var i=0; i<rows.length; i++) {
            var row = new Object();
            for(var c=0; c<this.Columns.length && c<rows[i].length; c++) {
                row[this.Columns[c].Name] = rows[i][c];
            }
            this.addRow(row);
        }
    }
}

addNamespace("Ajax.Web");

Ajax.Web.DataSet = function(tables) {
    this.__type = "System.Data.DataSet, System.Data";
    this.Tables = new Array();

    this.addTable = function(table) {
        this.Tables.push(table);
    }

    if(tables != null) {
        for(var i=0; i<tables.length; i++) {
            this.addTable(tables[i]);
        }
    }
}

function Person(id) {
    this.FirstName = "";
    this.FamilyName = "";
    this.Age = 0;
    this.ID = id;
    this.__type = 'AJAXDemo.Examples.Classes.Person, App_Code.un7rskvh, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null';
}

Person.prototype.get_FullName = function() {
    return this.FirstName + " " + this.FamilyName;
}

Person.prototype.toJSON = function() {
    var o = new Object();

    o.firstName = this.FirstName;
    o.familyName = this.FamilyName;
    o.age = this.Age;
    o.id = this.ID;

    return AjaxPro.toJSON(o);
}

Person.prototype.save = function() {
    return Person.save(this);
}

Person.save = function(p) {
    var ps = new PersonSaver();
    return ps.savePerson(p);    // synchronous call
}

var PersonSaver = Class.create();
PersonSaver.prototype = (new AjaxPro.Request()).extend({
    savePerson: function(p) {
        return this.invoke("SavePerson", {"p":p}).value;
    },
    initialize: function() {
        this.url = "ajaxpro/AJAXDemo.Examples.Classes.Person, App_Code.un7rskvh, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null.ashx";
    }
})

正因为是有了上面四个ashx文件我们的
function doTest()
{
    AJAXDemo.Examples.Test.TestMethod.GetTest("AjaxPro",doTest_callback);
}
才得以异步执行，这些ashx文件又是怎么生成到页面上的，那得归功于web.config的相关配置和下面这句代码：
Utility.RegisterTypeForAjax(typeof(AJAXDemo.Examples.Test.TestMethod));

至于Utility.RegisterTypeForAjax方法产生的一序列动作我将在后文中继续说明，有兴趣的可以自己跟踪下这些代码的执行。