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HTML 

              
                <h3>
   <a href="https://nanogallery2.nanostudio.org/" target="_blank">nanogallery2</a>
   - dynamic gallery handling (API)
</h3>

<div id="my_nanogallery2" 
     data-nanogallery2='{ 
        "itemsBaseURL":           "https://nanogallery2.nanostudio.org/samples/",
        "thumbnailWidth":         "auto",
        "thumbnailSelectable":    true,
        "thumbnailHoverEffect2":  null
        }'
     > nanogallery2
  <a href="berlin1.jpg" data-ngthumb="berlin1t.jpg" data-ngdesc="">Berlin 1 - image</a>
  <a href="berlin2.jpg" data-ngthumb="berlin2t.jpg" data-ngdesc="">Berlin 2 - image</a>
  <a href="berlin3.jpg" data-ngthumb="berlin3t.jpg" data-ngdesc="">Berlin 3 - image</a>
  <a href="" data-ngkind="album" data-ngid="1000" data-ngthumb="berlin3t.jpg" data-ngdesc="">Berlin 3 - album</a>
</div>



<button type="button" id="btn_add">add 1 image to the gallery</button>
<button type="button" id="btn_add_video">add 1 video to the gallery</button>
<button type="button" id="btn_add_album">add 2 images to the "Berlin 3" album</button>
<button type="button" id="btn_add_album2">create 1 album with 2 images</button>
<button type="button" id="btn_del">delete selection</button>
<button type="button" id="btn_select_mode">switch selection mode on/off</button>
!

CSS
!

JS 

              
                var baseURL = 'https://nanogallery2.nanostudio.org/samples/';

// add one image
jQuery('#btn_add').on('click', function() {
  var ngy2data = $("#my_nanogallery2").nanogallery2('data');
  var instance = $("#my_nanogallery2").nanogallery2('instance');
        
  // create the new item
  var ID = ngy2data.items.length + 1;
  var albumID = '0';
  var newItem = NGY2Item.New(instance, 'new berlin ' + ID, '', ID, albumID, 'image', '' );

  // define thumbnail -> image displayed in the gallery
  newItem.thumbSet( baseURL + 'berlin2t.jpg', 135, 204); // w,h

  // define URL of the media to display in lightbox
  newItem.setMediaURL( baseURL + 'berlin2.jpg', 'img');
  
  // currently displayed album
  if( ngy2data.items[ngy2data.gallery.albumIdx].GetID() == 0 ) {

    // add new item to current Gallery Object Model (GOM) 
    newItem.addToGOM();
  
    // refresh the display (-> only once if you add multiple items)
    $("#my_nanogallery2").nanogallery2('resize');
  }
});


// add one image
jQuery('#btn_add_video').on('click', function() {
  var ngy2data = $("#my_nanogallery2").nanogallery2('data');
  var instance = $("#my_nanogallery2").nanogallery2('instance');
        
  // create the new item
  var ID = ngy2data.items.length + 1;
  var albumID = '0';
  var newItem = NGY2Item.New(instance, 'new bricks ' + ID, '', ID, albumID, 'image', '' );

  // define thumbnail -> image displayed in the gallery
  newItem.thumbSet( baseURL + 'blocks_mp4_t.jpg', 135, 204); // w,h

  // define URL of the media to display in lightbox
  newItem.setMediaURL( baseURL + 'blocks.mp4', 'video');
  
  // currently displayed album
  if( ngy2data.items[ngy2data.gallery.albumIdx].GetID() == 0 ) {

    // add new item to current Gallery Object Model (GOM) 
    newItem.addToGOM();
  
    // refresh the display (-> only once if you add multiple items)
    $("#my_nanogallery2").nanogallery2('resize');
  }
});


// add 2 images to existing album
jQuery('#btn_add_album').on('click', function() {
  var ngy2data = $("#my_nanogallery2").nanogallery2('data');
  var instance = $("#my_nanogallery2").nanogallery2('instance');
        
  var ID = ngy2data.items.length + 1001;
  var albumID = '1000';   // ID of the album which will contain the 2 new images

  // ADD FIRST IMAGE
  var newItem1 = NGY2Item.New(instance, 'new image ' + ID, '', ID, albumID, 'image', '' );
  newItem1.thumbSet( baseURL + 'berlin1t.jpg', 320, 212); 
  newItem1.setMediaURL(  baseURL + 'berlin1.jpg', 'img');
  
  // ADD SECOND IMAGE
  ID = ngy2data.items.length + 1001;
  var newItem2 = NGY2Item.New(instance, 'new image ' + ID, '', ID, albumID, 'image', '' );
  newItem2.thumbSet( baseURL + 'berlin1t.jpg', 320, 212);
  newItem2.setMediaURL( baseURL + 'berlin1.jpg', 'img');
  
  // refresh the display if the album is displayed
  if( ngy2data.items[ngy2data.gallery.albumIdx].GetID() == albumID ) {
    newItem1.addToGOM();
    newItem2.addToGOM();
    $("#my_nanogallery2").nanogallery2('resize');
  }
  else {
    alert('images added');
  }
});


// Add 1 album with 2 images
jQuery('#btn_add_album2').on('click', function() {
  var ngy2data = $("#my_nanogallery2").nanogallery2('data');
  var instance = $("#my_nanogallery2").nanogallery2('instance');

  // ADD NEW ALBUM
  var newAlbumID = ngy2data.items.length + 2001;
  var newAlbum = NGY2Item.New(instance, 'new album ' + newAlbumID, '', newAlbumID, '0', 'album', '' );
  newAlbum.thumbSet( baseURL + 'berlin1t.jpg', 320, 212); 
  newAlbum.contentIsLoaded = true;

  // ADD FIRST IMAGE
  var ID = ngy2data.items.length + 2001;
  var newItem1 = NGY2Item.New(instance, 'new image ' + ID, '', ID, newAlbumID, 'image', '' );
  newItem1.thumbSet( baseURL + 'berlin1t.jpg', 320, 212); 
  newItem1.setMediaURL(  baseURL + 'berlin1.jpg', 'img');

  // ADD SECOND IMAGE
  ID = ngy2data.items.length + 2001;
  var newItem2 = NGY2Item.New(instance, 'new image ' + ID, '', ID, newAlbumID, 'image', '' );
  newItem2.thumbSet( baseURL + 'berlin1t.jpg', 320, 212);
  newItem2.setMediaURL( baseURL + 'berlin1.jpg', 'img');
  
  if( ngy2data.items[ngy2data.gallery.albumIdx].GetID() == 0 ) {
    newAlbum.addToGOM();
    $("#my_nanogallery2").nanogallery2('resize');
  }
  
  // $("#my_nanogallery2").nanogallery2('refresh');
});


// delete selection
jQuery('#btn_del').on('click', function() {
  var ngy2data = $("#my_nanogallery2").nanogallery2('data');
  ngy2data.items.forEach( function(item) {
    if( item.selected ) {
      item.delete();
    }
  });
  $("#my_nanogallery2").nanogallery2('resize');
});

// switch selection mode on/off
jQuery('#btn_select_mode').on('click', function() {
  var b = !$('#my_nanogallery2').nanogallery2('option', 'thumbnailSelectable');
  $('#my_nanogallery2').nanogallery2('option', 'thumbnailSelectable', b);
});
!
999px

Console