importPackage(java.io);

function directoryList(startPath){
	var fileObject=new File(startPath);
	var list = fileObject.list();
	var results = []; 

	for (var i=0; i<list.length; i++) {
	    var child = new File(startPath + "/" + list[i]);

	    if (child.isDirectory()){
	    	var recurseDirectoryListing = directoryList(child.getCanonicalPath());
	    	results = results.concat(recurseDirectoryListing);
	    }
	    else{
	    	var fileArray = {};
	    	fileArray['path'] = child.getCanonicalPath();
	    	fileArray['name'] = child.getName();
	    	fileArray['parent'] = child.getParent();
	    	fileArray['hidden'] = child.isHidden() ;
	    	fileArray['dir'] = child.isDirectory() ;
	    	var pos = fileArray['name'].lastIndexOf('.');
	    	if (pos < 0){
				fileArray['ext'] = '';
			}else{
				fileArray['ext'] = fileArray['name'].substring(pos+1);
			}	

	    	results.push(fileArray);
	    }
	    
	}
	return results;
}

A function that will return a list of files from a directory.

directoryList in Rhino

directory

JavaScript