gistfile1.js

postEvent(data, callbackFN, errorFN){

    let event_data = new FormData();

    Object.keys(data).forEach((key) => {
      if (data[key] instanceof FileList) {
        event_data.append(`event[${key}]`, data[key][0], data[key][0].name);
      } 
      else {
        if(key == 'attachments_attributes'){
            for (let x=0;x<data[key].length;x++){
              if(data[key][x].type == 'picture'){
                event_data.append(`event[${key}][${x}][picture]`, data[key][x].picture[0], data[key][x].picture[0].name);
                event_data.append(`event[${key}][${x}][type]`, data[key][x].type);
              }
              else{
                event_data.append(`event[${key}][${x}][form_id]`, data[key][x].form_id);
                event_data.append(`event[${key}][${x}][type]`, data[key][x].type);
              }
            }
        }
        else{
          event_data.append(`event[${key}]`, data[key]);
        }
      }
    });

    let config = new this.baseConfig({
      method: 'post',
      url: '/api/events',
      data: event_data,
      headers: { 'Authorization':(new KonektiApiV1).authorization ,'X-Client-Identifier':(new KonektiApiV1).client_identifier }
    });

    this.request.do(config, callbackFN, errorFN);
  }