ProjetMJCEditor/client/js/ui_filepicker.js

class UIFilePicker extends UIElement {
  init()
  {
      var size=(this.size)?this.size:12;
      var r = HTMLBuilder.rootElemDiv(size);
      var nsize=12;
      if(this.facultative) nsize-=2;
      var x = HTMLBuilder.file({ id: this.elemId, placeholder: this.placeholder });
      r.append(x);
      doFac(r,this);

      this.root.append(r);
  }
}

registerUiClass("file", UIFilePicker);