Macromedia flex 2-migrating applications to flex 2 Manual De Usuario

Miscellaneous

37

Arrays

Arrays no longer automatically update if you change the data. This means that you should no 
longer databind to an Array unless you manually call the 

dispatchEvent()

 each time an 

element in the Array changes. Otherwise, the control to which the data is bound will not 
reflect the changes. You can databind to a Collection.

Two convenience methods of the Array class have been removed. You can no longer use the 

addItem()

 and 

removeItem()

 methods. You must instead use 

push()

 and 

pop()

, 

respectively. Array was formerly a mixin, but is now used directly from the Flash package 
without modification. For example:

var cards:Array; 
// Old way.
cards.addItem({label: "Visa", data: CreditCardValidatorCardType.VISA}); 
// New way.
cards.push({label: "Visa", data: CreditCardValidatorCardType.VISA}); 

Arrays are commonly used as data providers in Flex applications. 

setInterval() and clearInterval()

The 

setInterval()

 and 

clearInterval()

 methods are now in the flash.util package, so to 

use them you must import that package. But the 

setInterval()

 and 

clearInterval()

 

methods are deprecated in favor of the new Timer class. 

For an example that uses a timer in a Flex application, see 

For information on using the Timer class, see the ActionScript 3.0 Language Reference.

Metadata

You must now separate metadata properties with commas. For example:

ActionScript 2.0:

[Style(name="horizontalAlign" enumeration="left,center,right" 

inherit="no")]

ActionScript 3.0:

[Style(name="horizontalAlign", enumeration="left,center,right", 

inherit="no")]