Neither will Ajax. It is true. However, it will be in the future.

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Ajax Research Summary ( (Author:Li TianpingReprinted, please note) )
From: http://www.cnblogs.com/ltp/archive/2005/12/03/289725.html

AjaxRecently, it has become popular and popular.WebRefreshing issues during development brings new vigor and hope. Although this technology was used long agoXMLHttpRequest JavascriptSeveral technologies are combined in a certain way, which is not a new technology. However, with a name and encapsulation, it still provides a lot of convenience for many developers. Therefore, I took the time to study it and applied it to the current project. I also made a summary here.

 

 

Specific use:

 

 

1.Add reference in ProjectAjax. dll(The version I used is 5.7.22 . 2)

 

 

2.ModifyWeb. config, Add

 

 

< Configuration >
< System . Web >
< Httphandlers >
< Add Verb = "Post, get" Path = "Ajax/*. ashx" Type = "Ajax. pagehandlerfactory, Ajax" />
</ Httphandlers >

< System . Web >
</ Configuration >

 

 

 

 

3.Create a new class that implements business logic, add a method to it, and add a method to the method.[Ajax. ajaxmethod ()]. For example:

 

 

/// <Summary>

 

 

///Business Logic class

 

 

/// </Summary>

 

 

Public ClassAjaxbllclass

 

 

{

 

 

PublicAjaxbllclass ()

 

 

{

 

 

}

 

 

[Ajax. ajaxmethod ()]

 

 

Public StringGetplacelist (IntClassid)

 

 

{

 

 

Advertisement. BLL. admanage. adplace =NewAdvertisement. BLL. admanage. adplace ();

 

 

Dataset DS = adplace. getlistbyclass (classid );

 

 

StringSTR = "";

 

 

For(IntM = 0; m <Ds. Tables [0]. Rows. Count; m ++)

 

 

{

 

 

STR + = "," + Ds. tables [0]. rows [m] ["placeid"]. tostring () + "|" + Ds. tables [0]. rows [m] ["placename"]. tostring ();

 

 

}

 

 

STR = Str. substring (1, str. Length-1 );

 

 

ReturnSTR;

 

 

}

 

 

 

 

4.On the call page. CSOfPage_loadAdd a class registration line to the eventCode

 

 

Private Void Page_load ( Object Sender, system. eventargs E)
{
// Valid registration methods
Ajax. Utility. registertypeforajax (Typeof(Ajaxbllclass ));
}

 

 

Note:Typeof (Ajaxbllclass)Medium,AjaxbllclassIs the class to contain the method to be called, that is,3Business Logic class created in stepAjaxbllclass

 

 

5.In the call page file or write a separateJSFile,JavascriptThe Code calls the method of the business logic class. For example:

 

 

FunctionClassresult ()

 

 

{

 

 

VaRClassid = Document. getelementbyid ("dropclassid ");

 

 

Ajaxbllclass. getplacelist(Classid. Value, get_class_result_callback );//CallBusiness logic methods

 

 

 

 

}

 

 

 

 

FunctionGet_class_result_callback (response)

 

 

{

 

 

If(Response. value! = NULL)

 

 

{

 

 

Document. getelementbyid ("dropplaceid"). Length = 0;

 

 

VaR piarray = response. value. Split (",");

 

 

For(VaRI = 0; I <piarray. length; I ++)

 

 

{

 

 

VaRAry1 = piarray [I]. tostring (). Split ("| ");

 

 

Document. getelementbyid ("dropplaceid"). Options. Add (NewOption (ary1 [1]. tostring (), ary1 [0]. tostring ()));

 

 

}

 

 

}

 

 

Return

 

 

}

 

 

6.Call

 

 

<Asp: dropdownlist ID="Dropclassid"Runat="Server"Width="250px"Onchange=" Classresult ()"></ASP: dropdownlist>

 

 

Note: For earlier versionsAjaxTo be modifiedGlobal. asaxOfApplication_startEvent, SetAjaxOfHandlerpath:

 

 

Protected VoidApplication_start (Object sender, eventargs E)
{
// Ajax. Utility. handlerpath = "ajax ";//Old Version requirements
}

 

 

Experience:I personally think that although it solves the page refresh problem to a certain extent, it needs to write a lot of script code, and. NetThe combination of the control and class library is not very good, and it is not suitable for a large number of projects. It is still used in some places where the refresh requirements are not too high.ASP. NETThe encoding method is better.

 

 

 

 

Download Sample Code

 

 

 

 

Add some Ajax Resources:

 

 

Http://ajax.schwarz-interactive.de

Http://weblogs.asp.net/mschwarz/

 

 

Http://groups.google.com/group/ajaxpro? Lnk = Li

 

 

MsdnAtlas onWebsite

 

 

ASP. NET "Atlas"Official Website

 

 

ASP. NET "Atlas"Preview document

 

 

AtlasQuick Start tutorial