Determine if hidden layers exist

[MarkWalsh]

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.

[Paul Riggott · Accepted solution]

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;
};

[MarkWalsh]

Thanks, Paul, that seems to work. Haven't tried it against any massive files yet, but it works with the files I tested.

Michael, I am using CS5-CS6. The 'Delete hidden layers' command was what I recorded with the ScriptListener, would have used the runMenuItem, but I'm lazy like Paul, and didn't bother to figure out how to look up the index.

Thanks to you both

[Michael_L_Hale]

I miss-read the post. Yeah I agree with Paul - just warp the executeAction in a try/catch.

I tried to see if I could get a descriptor for hidden layers with this code.

var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putEnumerated( charIDToTypeID( "Lyr " ), charIDToTypeID( "Ordn" ), stringIDToTypeID( "hidden" ) );
var desc = executeActionGet(ref)

But it returns the descriptor for the top layer regardless of that layer's visibility.

[Michael_L_Hale]

What version of Photoshop are you using? Newer version do have a 'delete hidden layers' command that you could call using app.runMenuItem()