openfoodnetwork/app/webpacker/controllers/bulk_actions_controller.js

import ApplicationController from "./application_controller";

export default class extends ApplicationController {
  static targets = ["extraParams"];
  static values = { reflex: String };

  connect() {
    super.connect();
  }

  perform() {
    let params = { bulk_ids: this.getSelectedIds() };

    if (this.hasExtraParamsTarget) {
      Object.assign(params, this.extraFormData());
    }

    this.stimulate(this.reflexValue, params);
  }

  // private

  getSelectedIds() {
    const checkboxes = document.querySelectorAll("table input[name='bulk_ids[]']:checked");
    return Array.from(checkboxes).map((checkbox) => checkbox.value);
  }

  extraFormData() {
    if (this.extraParamsTarget.constructor.name !== "HTMLFormElement") {
      return {};
    }

    return Object.fromEntries(new FormData(this.extraParamsTarget).entries());
  }
}