https://semena62.ru/bitrix/templates/aspro-premier/js/conditional/file-input.js

1const fileInputInit = function (message, reviews = 'N') {
2  BX.Aspro.Loader.addExt('uniform').then(() => {
3    $("input[type=file]:not('.uniform-ignore')").uniform({
4      fileButtonHtml: BX.message("JS_FILE_BUTTON_NAME"),
5      fileDefaultHtml: message
6    });
7
8    $(document).on("change", "input[type=file]", function () {
9      if ($(this).val()) {
10        $(this).closest(".uploader").addClass("files_add");
11        $(this).valid();
12      } else {
13        $(this).closest(".uploader").removeClass("files_add");
14      }
15    });
16
17    BX.bindDelegate(document, 'click', {class: 'add_file'}, function() {
18      if (!this.closest('.form')) return;
19
20      const index = $(this).closest(".input").find("input[type=file]").length + 1;
21
22      if (reviews === 'Y') {
23        $('<input type="file" class="form-control inputfile" tabindex="3" id="comment_images_n' + index + '" name="comment_images[]" value=""  />').insertBefore(this);
24      } else {
25        $('<input type="file" id="POPUP_FILE' + index + '" name="FILE_n' + index + '"   class="inputfile" value="" />').inserBefore(this);
26      }
27
28      $("input[type=file]:not('.uniform-ignore')").uniform({
29        fileButtonHtml: BX.message("JS_FILE_BUTTON_NAME"),
30        fileDefaultHtml: message,
31      });
32    });
33  })
34}