OCG object

This object provides support for Optional Content Groups. OCGs hold a collection of graphical objects, and are known as layers. You can dynamically switch properties of layers to make them visible or invisible to provide navigation in a PDF document.

For more information, see The Layers Pane.

The OCG object supports all properties and methods included in the Acrobat JavaScript specification.

Turns an OCG named ‘Overlay’ on (to turn it off, just change true to false in JavaScript code).

function turnOverlayOCG(doc) { 
     var ocgArray = doc.getOCGs(); 
     for(var i=0; i<ocgArray.length){ 
          if(ocgArray[i].name == Overlay){
               ocgArray[i].state = true; 
          } 
     } 
}