bitmapItem.hasValidAlphaLayer

#### Availability

Flash CS6 Professional.

#### Usage

bitmapItem.hasValidAlphaLayer

#### Description

Read-only property; a boolean indicating if a bitmap in the library has a valid/useful alpha channel. This flag will help you decide if you should export the bitmap item as a PNG instead of a JPEG using the bitmapItem.exportToFile() function.

#### Example

javascript
The following code exports a library item with the proper file name extension depending on whether it has a valid alpha layer.
var bitmapItem = fl.getDocumentDOM().library.items[0]; 

var uri = fl.browseForFileURI("open");

if (bitmapItem.hasValidAlphaLayer) uri += ".png"; 

    else uri += ".jpg";

bitmapItem.exportToFile(uri);

bitmapItem.sourceFileExists (../BitmapItem_object/bitmapIte9.md), bitmapItem.sourceFileIsCurrent (../BitmapItem_object/bitmapIt10.md), bitmapItem.sourceFilePath (../BitmapItem_object/bitmapIte11.md), FLfile.getModificationDate() (../FLfile_object/FLfile6.md)