AdvancED Flex 4

TURBO-CHARGING DATA BINDING

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[Bindable]

public class CustomerVO

{

[Bindable]

public var customerID:int;

public function CustomerVO(customerID:int) {

this.customerID = customerID;

}

}

}

The reason that the bindable tag is not needed for the CustomerID property is because the class is already

set to be bindable and every property in the class will be set bindable. This creates compile time errors and is

a waste of time writing the extra code

. Visit DevNet: http://www.adobe.com/devnet/

flex/articles/databinding_pitfalls.html to read more about databinding common misuse mistakes.

Summary

Data binding contains tremendous value, but also holds disadvantages. We recommend ensuring it is being

used correctly and when needed, because data binding can create overhead and memory leaks, which will

cause your application to suffer in terms of performance. In this chapter you learned about techniques for

using Data Binding. We covered one and two-way data binding using braces using MXML and binding tag as

well as the overhead associated with the process. You learned of using the BindingUtils class as well as

implicit and explicit data binding. We continued by showing you how to debug bindings and use a custom

TurboBinding Metadata.

We continued by explaining data binding between client side and server side by creating class and binding all

properties as well as binding using ObjectProxy class. Lastly, we helped you avoid common Flex data binding

pitfalls and common misuse mistakes by given examples.

In the next chapter, you will learn how to tune your applications for superior performance. You will be looking

under the hood of Flex and related Flash player features that impact performance.

CHAPTER 2

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