Javascript to toggle layer visibility doesn't work on pages created from page templates

[TmuVe]

I have a RPG character sheet with a toggle switch for a layer visibility. It works great on the main document pages but when I add new pages from templates the script doesn't work on the new pages.
Im using this script to toggle the visibility:

var layers = this.getOCGs();
for(var i=0;i<this.layers.length;i++) {
    if(layers[i].name == "Extras") {
        layers[i].state = !(layers[i].state);
    }
} 

[try67]

Do those pages have layers, too?

[TmuVe]

Yes. They are made in the same document on Illustrator. The extras layer is named the same on all pages.

[try67]

The question is whether the layer gets included in the Template object and then spawned to the new pages... I haven't tested that before. It's an interesting question. Can you share a sample file?

[TmuVe]

Sadly I cannot share it because it's not yet officially released. I'll do a mockup with same funtionality later.

The funny thing is when I go to Organize Pages and manually restore the templates to document, the layers work normally.

[TmuVe]

I have mockup version behind MEGA-link: Mockup test 

[JR Boulay · Accepted solution]

Templates and layers are incompatible: templates ignore layers.

[TmuVe]

Well, that's a shame. 😞
I was hoping to make some cool character sheet appearance switches but with this knowledge I'll just do different versions of the same sheet.

[TmuVe]

Can I first create a page from template and then add a layer with content to it or is it locked even after creation?

[try67]

That should be possible, yes.

[JR Boulay · Accepted solution]

You can add layers in a template page, but it will spawn a "flat" page with all layers merged.

[Thom Parker · Accepted solution]

I took a quick look at this. Page spawing works by copying all the page contents for the template page into a single XObject. Which makes sense. But it makes new copies of all the indirect objects, and most OCGs are added as Form XObjects. So, the OCG still exists on the newly spawned page, but is now disconnected. In fact it's a new OCG with the same name.  I think this is a bit of a bug. The spawn fuction should better manage the OCGs. It should either not make a new copy of the OCG dicitonary, or it should add the new copy to the OC Properties at the top level so Acrobat knows about it. Leaving dangling OCGs around seems like a bad practice.