Script to add mask of current layer to selection

@Chris201Chris 

As @c.pfaffenbichler writes, an action can do this. Record the action as follows.... With a selection active, hold down the shift key and the cmd or ctrl key and click on the layer mask with the mouse. Stop recording.

If you need ExtendScript code, then this should do the job:

if (hasLayerMask() == true) {
	addLayerMaskSelToSel();
} else {
	alert("The active layer doesn't have a raster layer mask!");
}


// c.pfaffenbichler from discussions with Mike Hale
function hasLayerMask () {
  var ref = new ActionReference();
  ref.putEnumerated(charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));
  var desc = executeActionGet(ref);
  return desc.hasKey(charIDToTypeID("UsrM"));
}

function addLayerMaskSelToSel() {
	var s2t = function (s) {
		return app.stringIDToTypeID(s);
	};
	var descriptor = new ActionDescriptor();
	var reference = new ActionReference();
	var reference2 = new ActionReference();
	reference.putEnumerated( s2t( "channel" ), s2t( "ordinal" ), s2t( "targetEnum" ));
	descriptor.putReference( s2t( "null" ), reference );
	reference2.putProperty( s2t( "channel" ), s2t( "selection" ));
	descriptor.putReference( s2t( "to" ), reference2 );
	executeAction( s2t( "add" ), descriptor, DialogModes.NO );
}

I assume things might improve but so far when people come to this Forum with ai-generated code it often appears to be pretty bad. 

Could you please post screenshots taken at View > 100% with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible to illustrate what exactly you are trying to automate? 

As far as I can tell loading transparency as a Selection should work even in Actions as should loading the active Layer’s Layer Mask as a Selection.