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Editor to share with you how to use events and behaviors in Flex applications, I believe most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's learn about it!

The use of events and behaviors in Flex applications

The principle of a HTML application is that the client makes a request and gets a response from the server. In contrast, Flex applications are event-based / event-based. For example, when a user clicks a button, an event is triggered. The application itself, not the server, contains logic to identify events and act accordingly.

Modify the properties of a component when an event is triggered in a ◆ Flex application

When you operate on a component programmatically, in order to respond to an event, you must first reference it, and you need to give it an ID value, as shown below:

You can then add the behavior / behavior to the application and change the property value of the component when an event is triggered, like this:

When the button is clicked, the visible property value of the panel is set to false.

Using ActionScript functional functions in ◆ Flex applications

You can also do the same by writing the ActionScript function and calling it in the event, in which case the click event for the button component is as follows:

The ActionScript function is defined in a block in the MXML file and then referenced to the click event of the button.

Separate ActionScript code for ◆

To better separate the ActionScript code from the MXML file, you can put them in a separate ActionScript file instead of as a function, and then import them into the MXML file, as follows:

◆ uses behavior and transformation to enhance rich visual interaction

Flex applications are event-driven, which means you can use events to add rich visual interaction while the program is running. To implement it, you use an event trigger to describe a behavior.

In the previous example, the visible property value of the panel component is set to false and is therefore not visible. You can also use behavior to create stronger visual effects.

The following example creates a behavior that first creates an effect and then binds it to the component's hideEffect property (trigger):

When the close button is clicked, the panel component fades out rather than disappears.

Triggers and effects can also be combined into more complex behaviors called transformations / transitions.

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