MACROMEDIA FLASH 8-FLASH Specifications download pdf (Page 240)

240 ActionScript: Add Interactivity

Play a movie clip

You can configure your document to play a movie clip at runtime. Using

the

attachMovie() method, you can attach an instance of a movie clip in

the Library panel to the Stage even though you have not placed an instance

on the Stage.

With the

attachMovie() method, you must export the symbol for

ActionScript and assign it a unique linkage identifier, which is different

from the instance name.

1. In the Library panel, right-click the MCTrio symbol and select Linkage

from the context menu.

2. In the Linkage Properties dialog box, select Export for ActionScript.

3. In the Identifier text box, verify that MCTrio appears as the

linkage name.

4. Verify that Export in First Frame is selected, and then click OK.

Movie clips that are exported for use with ActionScript load, by

default, before the first frame of the SWF file that contains them. This

can create a delay before the first frame plays. When you assign a

linkage identifier to an element, you can specify that the movie clip

loads on the first frame to avoid playback delays.

Use the attachMovie() method to play a

movie clip

You’ll now use the attachMovie() method to load the movie clip and

provide the symbol with an instance name. Since the instance of the

symbol does not exist on the Stage, you’ll create the instance name

programmatically.

1. In the Timeline, select Frame 1 of the Actions layer for Scene 1.

2. In the Script pane of the Actions panel, place the insertion point at the

end of your last line of code.

Press Enter (Windows) or Return (Macintosh), and then type the

following to add a comment and create a new function:

// function plays trio_mc when attachMovie_btn instance

// is released

attachMovie_btn.onRelease = function(){

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MACROMEDIA FLASH 8-FLASH Specifications Page 240