AppleScript JXA - Apple Photos script for organising photos into albums.

AddToAlbum.js

//Create a new ‘Quick Action’ in ‘Automator’, then 'Add JavaScript' and assign a keyboard shortcut to it for ideal workflow.
//by Rick Companje, May 2019

var Photos = Application("Photos")
Photos.includeStandardAdditions = true
var sel = Photos.selection();
var folder = Photos.folders.byName("Overig");

if (sel.length>0) {

  //show list with all album names ordered
  var names = folder.albums.name(); //original order for index
  var namesWithIndex = names.map(function(el,index) { return el }); // + " #" + index; });
  var namesSorted = namesWithIndex.sort();
  
  var result = Photos.chooseFromList(namesSorted, { withPrompt: sel.length + " foto's toevoegen aan een bestaand album?" })[0];

  if (result) {
    var selectedAlbum = Photos.folders.byName("Overig").albums.byName(result); //improved
    Photos.add(sel, {to: selectedAlbum });
  } else {
     var result = Photos.displayDialog("Nieuw album maken?", { defaultAnswer: "",  withIcon: 1 })
    if (result) {
      var album = Photos.make({new: "album", named: result.textReturned, at: folder });
      Photos.add(sel, {to: album });
    }
  }

}