Get selected text frame or image id in InDesign document

GetSelectedId

public function GetSelectedObjectID():String
{
	var objectId:String = "";
	if(InDesign.app.selection[0] != null)
	{
		if(InDesign.app.activeDocument.selection[0] is TextFrame)
		{
			var textObject:TextFrame = InDesign.app.selection[0];
			objectId = textObject.id.toString();
		}
		else 
		{
			if( InDesign.app.activeDocument.selection[0].allGraphics.length != 0 && 
			InDesign.app.activeDocument.selection[0].allGraphics[0] is Image)
			{	
				objectId =  InDesign.app.activeDocument.selection[0].allGraphics[0].id.toString();
			}
		}
	}
	return objectId;
}