MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH

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About variables 107

The first line of code specifies the image that you want to dynamically load into your

Flash document. Next, you check whether a new value for

imgURL was specified using

FlashVars or URL-encoded variables. If a new value was specified, the default image URL

is overwritten with the new value. For information on using URL variables, see “Using

variables from the URL” on page 101. For information on FlashVars, see “Using FlashVars

in an application” on page 104.

The next couple of lines of code define the MovieClip instance, and a Listener object for

the future MovieClipLoader instance. The MovieClipLoader’s Listener object defines two

event handlers,

onLoadInit and onLoadError. The handlers are invoked when the image

successfully loads and initializes on the Stage, or if the image fails to load. Then you create

a MovieClipLoader instance, and use the

addListener() method to add the previously

defined listener object to the MovieClipLoader. Finally, the image is downloaded and

triggered when you call the

MovieClipLoader.loadClip() method, which specifies the

image file to load and the target movie clip to load the image into.

3. Select Control > Test Movie to test the document.

Because you’re testing the Flash document in the authoring tool, no value for

imgUrl will

be passed by FlashVars or along the URL, and therefore the default image displays.

4. Save the Flash document and select File > Publish to publish the file as a SWF and HTML

document.

5. If you test your document in the Flash tool (select Control > Test Movie) or in a local

browser (File > Publish Preview > HTML), you will see that the image centers itself both

vertically and horizontally on the Stage.

6. Edit the generated HTML document in an editor (such as Dreamweaver or Notepad), and

modify the default HTML to match the following text:

codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/

swflash.cab#version=8,0,0,0" width="550" height="400"

id="urlvariables" align="middle">

<param name="FlashVars" value="imgURL=http://www.helpexamples.com/flash/

images/image2.jpg">

NOTE

Make sure that Flash and HTML are both selected in the Publish Settings dialog box.

Select File > Publish Settings and then click the Formats tab. Then, select both

options.

MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH - Page 107