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AJAX 2
AJAX Http Requests

In traditional JavaScript coding, if you want to get any information from a database or a file on the server, or send user information to a server, you will have to make an HTML form and GET or POST data to the server. The user will have to click the "Submit" button to send/get the information, wait for the server to respond, then a new page will load with the results.Because the server returns a new page each time the user submits input, traditional web applications can run slowly and tend to be less user-friendly.

With AJAX, your JavaScript communicates directly with the server, through the JavaScript XMLHttpRequest object With an HTTP request, a web page can make a request to, and get a response from a web server - without reloading the page. The user will stay on the same page, and he or she will not notice that scripts request pages, or send data to a server in the background.

Javascript Coding Visit Site
Adding AJAX to a website step by step
When looking at a adding AJAX you have a couple decisions you’ll want to make up front. One is what tools your going to use. In the webthumb case thats pretty easy. Webthumb is a simple PHP app and doesn’t use a framework, so I need a nice general PHP/AJAX framework that is easy to use, HTML_AJAX fits that need. I may also need so animations or other effects, since im not planning on doing anything really fancy i’ll use the extremly small but powerful moo.fx. I’ll also keep scriptaculous in mind if I end up needing something fancier, but I think its overkill for this project.
Adding Ajax Visit Site
AJAX and Session “Race Conditions”

Normally, when you write web applications in PHP, this is really not an issue, as each page request gets their own execution environment, and a user is only visiting one page at a time. Each page request coming from a particular user arrives more or less sequentially and shares no data with other page requests.

Ajax changes all of this, however: suddenly, one page visit can result in a number of simultaneous requests to the server.

Ajax Session Visit Site
Alternate Ajax Techniques, Part 1

. By now, nearly everyone who works in web development has heard of the term Ajax, which is simply a term to describe client-server communication achieved without reloading the current page. Most articles on Ajax have focused on using XMLHttp as the means to achieving such communication, but Ajax techniques aren't limited to just XMLHttp. There are several other methods; we'll explore some of the more common ones in this series of articles.

Ajax Technique Visit Site
Ajax - Javascript on Steroids

When javascript was released, people loved all the cool things you could do with the web browser to make a more user-friendly experience. You could do form validation, quirky popup messages, make cool web tools and more. However, Javascript had no way of sending information between the web browser and the web server.

If you wanted to get any information from a database on the server, or send user information to a server-side script like PHP, you had to make an HTML form to GET or POST data to the server. The user would then have to click "Submit", wait for the server to respond, then a new page would load with the results. I'm sure we have all gotten slightly annoyed when having to wait for especially slow websites!

Ajax attempts to remedy this problem by letting your Javascript communicate directly with the server, using a special Javascript object XMLHttpRequest. With this object, your Javascript can get information from the server without having to load a new page!

Ajax Javascript Visit Site
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