demarches-normaliennes/app/javascript/shared/activestorage/ujs.js

import ProgressBar from './progress-bar';

const INITIALIZE_EVENT = 'direct-upload:initialize';
const START_EVENT = 'direct-upload:start';
const PROGRESS_EVENT = 'direct-upload:progress';
const ERROR_EVENT = 'direct-upload:error';
const END_EVENT = 'direct-upload:end';

function addUploadEventListener(type, handler) {
  addEventListener(type, event => {
    // Internet Explorer and Edge will sometime replay Javascript events
    // that were dispatched just before a page navigation (!), but without
    // the event payload.
    //
    // Ignore these replayed events.
    const isEventValid = event && event.detail && event.detail.id != undefined;
    if (!isEventValid) return;

    handler(event);
  });
}

addUploadEventListener(INITIALIZE_EVENT, ({ target, detail: { id, file } }) => {
  ProgressBar.init(target, id, file);
});

addUploadEventListener(START_EVENT, ({ target, detail: { id } }) => {
  ProgressBar.start(id);
  const button = target.form.querySelector('button.primary');
  if (button) {
    button.removeAttribute('data-confirm');
  }
});

addUploadEventListener(PROGRESS_EVENT, ({ detail: { id, progress } }) => {
  ProgressBar.progress(id, progress);
});

addUploadEventListener(ERROR_EVENT, ({ detail: { id, error } }) => {
  ProgressBar.error(id, error);
});

addUploadEventListener(END_EVENT, ({ detail: { id } }) => {
  ProgressBar.end(id);
});