Determine if hidden layers exist

Question

I am building a script to cleanse photoshop documents, and one of the options I am including is to remove all hidden layers. There is no direct command to do so (or none that I have seen), so I used a chunk of code from ScriptListener to perform the 'Delete hidden layers' command.
I only want to enable this option if there are layers that are hidden, so I'm wondering if there is a simple way to determine if any layers are hidden in the document (aside from looping through all of the layers). Or, if there's a way to determine if the 'Delete hidden layers' command is enabled or not, since that is only enabled when there are hidden layers.

Answer 1

I would just bung the code between a try catch block (but I'm lazy )
If you did want to check this should be fast...
alert(hasHiddenLayers());
function hasHiddenLayers(){
   var ref = new ActionReference();
   ref.putEnumerated( charIDToTypeID('Dcmn'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
   var count = executeActionGet(ref).getInteger(charIDToTypeID('NmbL')) +1;
try{
    activeDocument.backgroundLayer;
var i = 0; }catch(e){ var i = 1; };
   for(i;i<count;i++){
       if(i == 0) continue;
        ref = new ActionReference();
        ref.putIndex( charIDToTypeID( 'Lyr ' ), i );
        var desc = executeActionGet(ref);
        var layerName = desc.getString(charIDToTypeID( 'Nm  ' ));
        var Id = desc.getInteger(stringIDToTypeID( 'layerID' ));
        if(layerName.match(/^<\/Layer group/) ) continue;
        if(!desc.getBoolean(charIDToTypeID( "Vsbl" ))) return true;
return false;