mxml

Looks like I can use components for both <mx:> or <s:> . So, which has more advantages? As other posters have mentioned, the spark (s:) namespace refers to the new components introduced with Flex 4, while the halo/mx (mx:) namespace refers to the older components. They can be used together, which is necessary since there are not spark equivalents for all of the mx components (notable omissions are DataGrid, Tree, DividedBox, among others.) Some of the motivations for the new spark components include: Separation of form from function, which means the spark components are very much skin driven.

In flex 3, with List component, you could add an effect to the itemChangeEffect property, allowing you to animate the addition/removal of the items in the list control. The equiv in the spark list appears to be the rendererAdd and Removed events, but this doesn't allow complete control over the effect, since removal is done as soon as the event has been dispatched, allowing no time for the effect. Does anyone know how to accomplish the same on a spark list? Lance Pollard Check out this answer on Stack Overflow: Animating Child Elements in Flex 4 . Flex 3 Lists had the itemChangeEffect

I want to set the enabled property on a button based on the return value of a function that has one or more parameters. How can I do this? private function isUserAllowed (userName:Boolean):Boolean { if (userName == 'Tom') return true; if (userName == 'Bill') return false; } <mx:Button label="Create PO" id="createPOButton" enabled="<I want to call isUserAllowed ('Bill') or isUserAllowed ('Tom') here>" click="createPOButton_Click()" /> <mx:Button enabled = "{this.myFunction(this.myVariable)}" > or inline: <mx:Button enabled = "{(function(arg:Object):Boolean{ ... })(this.myVariable)}" > According

As the title suggests, what's the difference between a "Component" (New –> MXML Component) and a "Module" (New –> MXML Module)? Thanks, David Modules are compiled into SWFs and loaded at runtime with ModuleLoader, whereas MXML components are compiled into an application. From the Flex docs: Modules are SWF files that can be loaded and unloaded by an application. They cannot be run independently of an application, but any number of applications can share the modules. Modules let you split your application into several pieces, or modules. The main application, or shell, can dynamically load

I am just getting started with flex and am using the SDK (not Flex Builder). I was wondering what's the best way to compile a mxml file from an ant build script. The Flex SDK ships with a set of ant tasks. More info at: http://livedocs.adobe.com/flex/3/html/help.html?content=anttasks_1.html Here is an example of compiling Flex SWCs with ant: http://www.mikechambers.com/blog/2006/05/19/example-using-ant-with-compc-to-compile-swcs/ mike chambers I would definitely go with the ant tasks that are included with Flex, they make your build script so much cleaner. Here is a sample build script that

Is it possible to use the Flex Framework and Components, without using MXML? I know ActionScript pretty decently, and don't feel like messing around with some new XML language just to get some simple UI in there. Can anyone provide an example consisting of an .as file which can be compiled (ideally via FlashDevelop, though just telling how to do it with the Flex SDK is ok too) and uses the Flex Framework? For example, just showing a Flex button that pops open an Alert would be perfect. If it's not possible, can someone provide a minimal MXML file which will bootstrap a custom AS class which