Brett McLaghlin,
Writer, editor
, O'Reilly and Associates
2006
year
1
month
04
Day Source Url: http://www-128.ibm.com/developerWorks/cn/xml/wa-ajaxintro1.html
Five years ago, if you don't know
Xml
You are a ugly ducklings who are unattended. Eighteen months ago,
Ruby
It became the center of attention, I don't know
Ruby
The programmer can only sit on the cold bench. Today, if you want to keep up with the latest technology, then your goal is
Ajax
.
but,
Ajax
Not only
It is a fashion, it is a powerful way to build a website, and it is not as difficult as learning a new language.
Detailed discussion
Ajax
Before what, let us take a few minutes.
Ajax
do
what. Currently, there are two basic options when writing applications:
Desktop application web application
Both are similar, desktop applications usually
CD
For the media (sometimes downloadable from the website) and fully installed on your computer. Desktop applications may use the Internet to download updates, but run the code for these applications on the desktop computer.
Web
Application is running somewhere
Web
Server
-
Not strange, pass
Web
The browser accesses this application.
However, what is more important than the running code of these applications is how the application is running and how to interact with it. Desktop applications are generally fast (just run on your computer, do not wait for internet access), with beautiful user interfaces (usually related to operating systems) and extraordinary dynamics. You can click, select, Enter, open the menu and submenu, you can patrol everywhere, basically no need to wait.
on the other hand,
Web
The app is the latest trend, which provides services that cannot be implemented on the desktop (for example
Amazon.com
with
eBay
). However, accompanying
Web
The powerful and appearing is waiting, waiting for the server response, waiting for the screen to refresh, wait for the request to return and generate a new page.
Obviously this is too simple, but the basic concept is. You may have already guessed,
Ajax
Try to establish the function and interactivity of desktop applications, with continuously updated
Web
Bridge between the application. You can use dynamic user interfaces and beautiful controls in desktop applications, but it is
Web
In the application.
What are you waiting for? Let's take a look
Ajax
How to get clumsy
Web
Interface transformation into fast response
Ajax
Application.
Old technology, new skill
Talk
Ajax
In actually involving a variety of technologies, it is necessary to flexibly use it necessary to understand these different technologies (including the first few articles of this series will discuss these technologies respectively). Good news is that you may have been very familiar with most of them, and better is that these technologies are easy to learn, unlike complete programming languages (such as
Java
or
Ruby
It is difficult.
Ajax
Definition
By the way,
Ajax
Yes
Asynchronous JavaScript and XML
(as well as
DHTML
Abbreviations. This phrase is
Adaptive path
of
Jesse James Garrett
Invention, according to
Jesse
Explanation, this is not
A first alphabetic word.
Below is
Ajax
Basic techniques used by the application:
HTML is used to establish a web form and determine the fields used in other parts of the application. JavaScript code is the core code of running the AJAX application to help improve communication with the server application. DHTML or Dynamic HTML for dynamic update forms. We will use DIV, SPAN, and other dynamic HTML elements to mark HTML. Document Object Model DOM is used to handle the HTML structure and (in some cases) the XML returned by the HTML structure and (in some cases). Let's further analyze the responsibilities of these technologies. In the future article, I will discuss these technologies in the future, as long as they are familiar with these components and technologies. The more familiar with these codes, the easier, the easier from the zerogenic understanding of these technologies to the truly grasp these techniques (also truly open
Web
The gate of application development).
XMLHTTPREQUEST
Object
An object to be understood may be the most strange to you,
XMLHTTPREQUEST
. This is an
JavaScript
Object, create this object is simple, such as list
1
Indicated.
List
1. Create a new XMLHttpRequest object
