Untitled

function imagesPreview(input, placeToInsertImagePreview) {
  return new Promise((resolve, reject) => {
    if (input.files) {
      var filesAmount = input.files.length;

      for (i = 0; i < filesAmount; i++) {
        var reader = new FileReader();
        reader.onload = function(event) {
          $($.parseHTML('<img class="preview__thumb">')).attr('src', event.target.result).appendTo(placeToInsertImagePreview);
          if (i === filesAmount - 1) {
            resolve(); // resolve the promise when all images have been added
          }
        };
        reader.readAsDataURL(input.files[i]);
      }
    } else {
      reject(new Error('No files provided'));
    }
  });
}

$('#file__input').on('change', function() {
  imagesPreview(this, '#the__gallery')
    .then(() => {
      var count = $('.preview__thumb').length;
      console.log('Count:', count);
      // You can apply your custom styles based on the count here
    })
    .catch((error) => {
      console.error(error);
    });
});