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.

Properties & Methods

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

Esempio:

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; 
          } 
     } 
}