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01 - Introduction to Flex world

What is Flex?

Adobe Flex is a platform, framework, technology or whatever you call for building RIAs (Rich Internet Application). Rich Internet Applications (RIAs) are complete applications that run from a simple browser.

An example of an RIA is that Google Docs is not just a word processor that runs entirely from a browser and a very acceptable speed. Perhaps you are reading this ever wondered how it is that you can use a very powerful word processor from a browser and, moreover, that this start faster than the same Microsoft Office or Open Office you have installed on your computer. This is due to principle that handles all the web 2.0. Asynchronous calls . (Come to the bear is!?)

remember the sweat drops that fell on our faces when navegávamos Internet using a telephone modem. Before clicking on any link to a page 2 times and thought to do that here demanded that the page is reloaded peer to peer. If the header of the page was a picture of 500Kb (enough for a header image) the 500K plus all the rest of the page is reloaded what had long waiting time and unnecessary traffic on the network.

The interaction with the page was us by clicking on the buttons and the page changing shape. This type of web server calls are called Synchronous requests as we choose when to send information to the server and then we stayed waiting for the server to process our order and then change the page. Our Click us completely immobilized.

Here comes the definition! asynchronous requests allows us to continue our interaction with the page while the server processes the information. When the server finishes processing our data will tell us that the data has been received and we will handle this data as we see fit. Que tal?

In the example of a word processor, initially only charge us the cover of the application, and as we interact with the site will make small calls to the server that affect only a small small part of the page. Today

in the world of these rich Internet applications are a lot of competition. We have AJAX (Asynchronous JavaScript and XML), JavaFX , Microsoft Presentation Foundation, Open Lazlo and obviously Adobe Flex. All these are grouped in what became known as Web 2.0.

Flex, to run in browsers, Flash Player uses the (known through the pages made in flash and play videos from youtube). This means that any browser that can view youtube videos will be able to view and interact with an application made in flex.
The main advantages are basically noticed using flex 3:

1. is very, very simple create a page using its Flex 2 languages: MXML and Actionscript.
2. Pages created in flex are the same everywhere Internet browser (either Firefox, Internet Explorer, Chrome, etc)
   
3. Adobe created a small Google alliance and Yahoo to create a algorimo allowing indexing of SWF files . This means that pages will do to flex to be found from Google or Yahoo.
   

Anyway, as you know this blog is dedicated to learn a bit of the Flex platform, so I hope they can learn, nerd or geek in the blog. For my part I will try to overturn the modest knowledge I have about Flex so that they can use this powerful tool. I hope, too, do not lose the incentive and end all practices that I have thought of writing to date.