prev | index | next

In the Flash specifications is written:
The DoInitAction tag is similar to the DoAction Tag: it defines a series of bytecodes to be executed. However, the actions defined with DoInitAction are executed earlier than the usual DoAction actions, and are executed only once.
There are situations in which there are actions that must be executed before the ActionScript representation of the first instance of a particular sprite is created. The most common such action is calling Object.registerClass to associate an ActionScript class with a sprite. Such a call is generally found within the #initclip pragma in the ActionScript language. DoInitAction is used to implement the #initclip pragma.
A DoInitAction tag specifies a particular sprite to which its actions apply. There may be multiple DoInitAction tags in a single frame; their actions will be executed in the order in which the tags appear. However, there may only be one DoInitAction tag anywhere in the SWF file for any particular sprite.
The specified actions are executed immediately before the normal actions of the frame in which the DoInitAction tag appears. This only occurs the first time that this frame is encountered – if playback reaches the same frame again later, actions provided in DoInitAction are skipped.

(mx-doinitaction.rswf)

background 153.165.139
fnt_Courier: Font [name "Courier New" bold]
txt_test: EditText x 320x20 [
    ReadOnly WordWrap Font [fnt_Courier 12]
    layout [indent: 10 leading: -2]
]
spr_somesprite: Sprite [
    place txt_test
    showFrame end
]
DoInitAction spr_somesprite [
    step: 1 + random 9
    x: "This was set By doInitAction -> step: " add step
]
test: place spr_somesprite at 0x0
place txt_test at 0x20
frm_loop: show 2 frames
doAction [
    test.x: test.x + step
    goto frm_loop and play
]

showFrame
end