determine if pdf has layers

[four80eastfan]

I'm trying to determine if a pdf has layers (I'm very new to Javascript and this API). Below is the function that I've written for this:

var check_flat = function()
{
    for(var page = 0; page < this.numPages; page++){
        var ocgArray = this.getOCGs(page);
        if(ocgArray != null){
            console.println(page + " has layers");
        } else{
            console.println("no layers on this page");
        }
    }
};

When I try this on a pdf that I'm certain has layers, I only get 'no layers on this page'. Your help is very much appreciated!

[try67]

The code looks fine. Are you sure the file actually has layers?

[four80eastfan]

Thanks for the reply. I've tried with text buttons, comments, and e-signatures. Am I correct in thinking that these are in their own layers or am I mistaken?

[try67 · Accepted solution]

You are mistaken. They are form fields or comments (annotations).

[JR Boulay]

Unlike in an InDesign document, in an Acrobat PDF form fields are not attached to a layer, they are floating above layers.