MACROMEDIA FLASH 8-EXTENDING FLASH Manual page 196

Returns
The data specified by the
Description
Method; retrieves the value of the data specified by the
depends on the type of the data that was stored (see
symbols and bitmaps support persistent data.
Example
The following example sets and gets data for the specified element, shows its value in the
Output panel, and then removes the data:
// At least one symbol or bitmap is selected in the first layer, first
frame.
var elt =
fl.getDocumentDOM().getTimeline().layers[0].frames[0].elements[0];
elt.setPersistentData("myData","integer", 12);
if (elt.hasPersistentData("myData")){
fl.trace("myData = "+ elt.getPersistentData("myData"));
elt.removePersistentData( "myData" );
fl.trace("myData = "+ elt.getPersistentData("myData"));
}
element.hasPersistentData()
Availability
Flash MX 2004.
Usage
element.hasPersistentData( name )
Parameters
A string that specifies the name of the data item to test.
name
Returns
A Boolean value:
true
Description
Method; determines whether the specified data has been attached to the specified element.
Only symbols and bitmaps support persistent data.
196 Objects
parameter, or 0 if the data doesn't exist.
name
if the specified data is attached to the object;
parameter. The type of data
name
element.setPersistentData()
false
). Only
otherwise.