Flex Tutorials

What is Flex?

Category: flex tutorials | 686 views | 1 Comment

Flex is a convoluted term for sure. As the history of the product has evolved it has been a j2ee server, an as framework, a compiler and and IDE among other things.

In todays day and age we are at a released version 3, with version 4 in beta. The term flex typically refers to a way of developing flash platform application using the components in the open source framework developed by adobe.

Flex applications are written as a combination of xml markup (mxml) and actionscript much in the same vein that html applications are written with JS. The big difference is that the output of all your mxml and actionscript files is a single swf that can be embedded in a web page and displayed to the world. You can also use Flex to develop AIR applications, applications that can be installed on a users desktop. Read more…

Flex Framework

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A lot of people steer clear of the Flex framework because they think it’s complicated. But generally speaking, a framework is just a set of reusable classes that can work together to provide a base for an application.

Take a house as an analogy: every house on the planet has a framework. Each house has a foundation and walls, and those walls can’t stand without the foundation. Once the foundation has been laid and the walls are up, a roof can be applied and the interior designed and implemented, while work continues on the initial foundation.

If we apply this analogy to the Flex framework, we have a stack of logic — the controller logic — that has been made available for communicating with a database, handling security, writing to the file system, and so on. There are also the user interface elements — buttons, canvases, dropdown lists, and so on. All of these also form the foundation of your Flex application — the concrete slab, the timber beams and the bricks with which to build your house.

Flex is easy for web developers to learn because, at its core, it has a lot in common with (X)HTML, CSS, and JavaScript. Suppose you wanted to create a simple web page with a form button. In XHTML you’d type the following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”> <html xmlns=”http://www.w3.org/1999/xhtml”> <head> <meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ /> <title>Button Example</title> </head>

<body> <form method=”post” id=”example” action=”http://www.example.com/”> <input type=”button” name=”newButton” id=”newButton” value=”This is a button” onclick=”checkForm()” /> </form> </body> </html>

Enabling and disabling a validator in Flex

Category: Flex Examples, Flex Samples, flex tutorials | 2,406 views | 1 Comment

The Validator.enabled property lets you enable and disable a validator. When the value of the enabled property is true, the validator is enabled; when the value is false, the validator is disabled. When a validator is disabled, it dispatches no events, and the validate() method returns null.
For example, you can set the enabled property using data binding, as the following code shows:
Code Samples:

<?xml version=”1.0″?>
<!– validators\EnableVal.mxml –> Read more…

    

	
								
Flex Validating required fields
Flex Tutorial
Getting URL Parameters in Flex Actionscript
Exception Handling with Flex 
Creating a simple image gallery with the Flex TileList control
Flex 2.0 Basics
What is Flex?
Rich Internet applications (RIAs)
Introducing Flex
Flex Framework

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Enabling and disabling a validator in Flex