Re: [flexcoders] JUST SAY NO to creationPolicy="all" !

[greg h]

Regarding Gordons having to repeatedly post on the perils of
creationPolicy="All" let's all please save the following link and post
it on creationPolicy questions (so that Gordon can get back to creating
more amazing Flex functionality :-):
http://livedocs.macromedia.com/flex/2/langref/mx/core/ContainerCreationPolicy.html#ALL

The link above is for the page in the Language Reference that reads:
Avoid using this creationPolicy because
   it increases the startup time of your application.
   There is usually no good reason to create components at startup
   which the user cannot see.
   If you are using this policy so that you can "push" data into
   hidden components at startup, you should instead design your
   application so that the data is stored in data variables
   and components which are created later "pull" in this data,
   via databinding or an initialize handler.


Regarding John's statement that "There's a book somewhere here on best
practices and performance/tuning to address issues like this."

I believe what John is referring to is:

BOOK:  Building and Deploying Flex 2 Applications 
CHAPTER 6: Improving Startup Performance
http://livedocs.macromedia.com/flex/2/docs/00001424.html

This chapter includes sections on:
About startup order
Using deferred creation
Creating deferred components
This chapter should be required reading before setting creationPolicy="All"  :-)

Regrettably setting creationPolicy="All" is the switch that turns off
deferred creation.  The only time this makes sense is for small,
odd out applications in Flex.

For anything more involved, I found that as I started to use Cairngorm,
the temptation to use creationPolicy="All" went away altogether :-)

hth,

g

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