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Make asynchronous requests with JavaScript and Ajax

Most Web applications use a request/response model that gets an entire HTML page from the server. The result is a back-and-forth that usually involves clicking a button, waiting for the server, clicking another button, and then waiting some more. With Ajax and the XMLHttpRequest object, you can use a request/response model that never leaves users waiting for a server to respond. In this article, Brett McLaughlin shows you how to create XMLHttpRequest instances in a cross-browser way, construct and send requests, and respond to the server.

Asynchronous Request Visit Site
Rasmus’ 30 second AJAX Tutorial

I find a lot of this AJAX stuff a bit of a hype. Lots of people have been using similar things long before it became “AJAX”. And it really isn’t as complicated as a lot of people make it out to be. Here is a simple example from one of my apps. First the Javascript:

Ajax Tutorial Visit Site
Ajax - Try/Catch Blocks of Code

To create this important Ajax object, you are going to have to use a special programming technique known as "try and catch". Basically it attempts to "try" a piece of code and if that piece causes an error it "catches" the error and keeps going. Normally when an error occurs the code will stop running, however, the "catch" eats up the error and lets the code continue.

In the following code we are going to "try" three different ways to make a new XMLHttpRequest object. Every time we fail and get an error, we will catch the error and try the next a different command

Try - Catch block Visit Site
Sending requests with XMLHttpRequest

Once you have your request object, you can begin the request/response cycle. Remember, XMLHttpRequest's only purpose is to allow you to make requests and receive responses. Everything else -- changing the user interface, swapping out images, even interpreting the data that the server sends back -- is the job of JavaScript, CSS, or other code in your pages. With XMLHttpRequest ready for use, now you can make a request to a server.

XML HttpRequest Visit Site
Form validation with AJAX/PHP/MySQL

Here is a simple, quick way to validate required form fields using AJAX, PHP and MySQL. What we’re going to do is display an error message to the right of the required field, and if there are errors, restrict the submit button. And if a user were to skip a required field, or leave it blank, we’ll highlight it along with removing the submit button.

I feel this is useful because it validates on the fly using PHP methods that we may already have in place – there is no need to learn the “Javascript way” to do something that you’ve been doing for a while. I make a few assumptions in this tutorial. The first is that you have a basic understanding of PHP and how to connect to a MySQL database and retrieve records. Along with that, for this tutorial, you’ll need a table setup with usernames and email addresses stored in it; my table will be called “users.” The second is that you have some understanding of how AJAX works. Third is that you have an understanding of CSS and how to define classes and id’s. You could figure these things about by going through this tutorial, but it would be a lot easier on you if you do understand what I laid out.

Form Validation Visit Site
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