Is there a way to EXPAND a group in Photoshop?

Question

In the Layers panel, Photoshop has a dropdown option to 'Collapse All Groups'. Is there a reverse option to expand one or all groups or a way to do it in Javascript?

Answer 1

Here you go, answer is derived from

https://community.adobe.com/t5/photoshop/expand-collapse-a-group-via-javascript/td-p/7286289/page/2?page=1%3F

var groupname = app.activeDocument.activeLayer.name // name of active layer 
var idungroupLayersEvent = stringIDToTypeID( "ungroupLayersEvent" ); // ungroup layer event 

var desc14 = new ActionDescriptor();

var idnull = charIDToTypeID( "null" );

var ref13 = new ActionReference();

var idLyr = charIDToTypeID( "Lyr " );
var idOrdn = charIDToTypeID( "Ordn" );
var idTrgt = charIDToTypeID( "Trgt" );
ref13.putEnumerated( idLyr, idOrdn, idTrgt );
desc14.putReference( idnull, ref13 );

executeAction( idungroupLayersEvent, desc14, DialogModes.NO );

var idMk = charIDToTypeID( "Mk  " ); // make action , note the space
var desc15 = new ActionDescriptor();
var idnull = charIDToTypeID( "null" );

var ref14 = new ActionReference();

var idlayerSection = stringIDToTypeID( "layerSection" );
ref14.putClass( idlayerSection );
desc15.putReference( idnull, ref14 );
var idFrom = charIDToTypeID( "From" );

var ref15 = new ActionReference();

var idLyr = charIDToTypeID( "Lyr " ); // <-- note the space
var idOrdn = charIDToTypeID( "Ordn" );
var idTrgt = charIDToTypeID( "Trgt" );
ref15.putEnumerated( idLyr, idOrdn, idTrgt );
desc15.putReference( idFrom, ref15 );

executeAction( idMk, desc15, DialogModes.NO );
app.activeDocument.activeLayer.name = groupname // recall group name