Hide one layer, and remove the visible layers using preflights!

Question

Hello,
I have one pdf (with one layer called "ARTWORK")  in which I create a layer using Javascript. To do this I create a watermark and asigning it to a OCG contents with this code:
this.addWatermarkFromText("watermark");
this.getOCGs();
function FindOCG(cName) {
    var aOCGs = this.getOCGs();
    for(var i=0; aOCGs && i<aOCGs.length;i++) {
        if(aOCGs[i].name == cName) return aOCGs[i];
    return null;
var ocg = null;
while( (ocg = FindOCG("Watermark")) != null) ocg.name = "NEW LAYER";
this.setOCGOrder(this.getOCGs());
Then I successfully run a preflight profile, which is able to select an object filled with a defined spot colour and put it on the layer named "NEW LAYER"
The result of this is that I have two layers, (ARTWORK and NEW LAYER)
But when I want to view ONLY the contents of the NEW LAYER, it is necessary to  show the ARTWORK layer as well, otherwise I see the only the text "watermark" added in the Javascript.
My intention is hide the ARTWORK layer and show only the elements that I moved to the NEW LAYER, running the following Javascript code:
var ocgs = this.getOCGs();
for (var i in ocgs) {
    if (ocgs[i].name=="NEW LAYER")
        ocgs[i].state = true;
else ocgs[i].state = false;
and then run another preflight to remove invisible layers.
But it seems  that even that I move the elements to the new layer, somehow they still remain in the artwork layer...
Anyone could help me to solve this, please?
Thanks and Regards.

Answer 1

This is not really a JS question, more of a Preflight question...