Asynchronous first Experience

I learned a new knowledge yesterday Ajax Ajax is "asynchronous Javascript and XML "(Asynchronous JavaScript and XML) is a Web development technique that creates an interactive Web application. This is the advantage of Baidu to: through the background and the server for a small amount of data exchange, AJAX can make the Web page implementation of asynchronous update. This means that you can update a part of a webpage without reloading the entire page. Traditional Web pages (without AJAX) if you need to update your content, you must reload the entire page surface.

I have heard of this thing long ago, it sounds very big on the AH!

I think that is, register an event for a button, use a new thread to access the background when clicked, and then proceed to the following logic based on the resulting return.

In fact, Ajax is a piece of JavaScript code.

1<script src= ". /js/jquery-1.8.2.js "></script>2<script type= "Text/javascript" >3$(function () {4$ ("#btnLogin"). Click (function() {5$.get ("Plogin.ashx", {6UserName: $ ("#txtClientID"). Val (),7PWD: $ ("#txtPassword"). Val (),8Code: $ ("#txtCode"). Val ()9},function(data) {Ten                     if(data== "OK") { OneWindow.location.href = "Main.aspx"; A}Else { - alert (data); -                     } the                 }); -             }); -});

The first is the introduction of jquery, in fact, directly with JavaScript can be achieved, but jquery package for us, it is very cool to use

Register a Click event for the button, using $.get () or $.post () in the method

There is no difference between the two methods used in jquery, there are three parameters.

First: The address that needs to be requested

Second: A JSON-formatted key-value pair, which is a parameter passed to the background

The third: Pass a method in, the method has a parameter, is used to receive the data returned in the background, the method body is based on the returned data to implement the next logic.

The following is a section of my general handler code:

1  Public classlogin1:ihttphandler,irequiressessionstate2     {3 4          Public voidProcessRequest (HttpContext context)5         {6Context. Response.ContentType ="Text/plain";7             stringUserName = context. request["UserName"];8             stringPassword = context. request["PWD"];9             stringValidatecode = context. request["Code"];Ten  One             //Verification Code Check A             stringServercode = context. session["Validatecode"] ==NULL -?string. Empty -: Context. session["Validatecode"]. ToString (); the             if(Servercode = =string. Empty | | Validatecode! =Servercode) -             { -                 //Checksum Failure -Context. Response.Write ("Verification Code check failed"); +             } -             Else +             { ABll. Hksj_users BLL =Newhksj_users (); atList<model.hksj_users> list= BLL. Getmodellist (string. Format ("loginname= ' {0} ' and password= ' {1} '", UserName, Password)); -                 if(list. count>=1) -                 { -Context. session["Loginuser"] = list[0]; -Context. Response.Write ("OK"); -                 } in                 Else -                 { toContext. Response.Write ("Login Failed"); +                 } -             } the  *  $         }Panax Notoginseng  -          Public BOOLisreusable the         { +             Get A             { the                 return false; +             } -}

It is important to note that because the session is used in a generic handler, the interface implemented in this class needs to be irequiressessionstate this interface

Asynchronous first Experience