レコードの同時編集を防止

(function () {
  "use strict";
  var revisionCheck = function (event) {
    return kintone.api(kintone.api.url('/k/v1/record', true), 'GET', {
      app: kintone.app.getId(),
      id: kintone.app.record.getId(),
    }).then(function (response) {
      return event.record.$revision.value === response.record.$revision.value;
    });
  };
  var changeState = function (editing) {
    return kintone.api(kintone.api.url('/k/v1/record', true), 'PUT', {
      app: kintone.app.getId(),
      id: kintone.app.record.getId(),
      record: {
        編集中: {
          value: editing ? kintone.getLoginUser().id : 0
        }
      }
    });
  };
  kintone.events.on([
    'app.record.detail.show',
  ], function (event) {
    revisionCheck(event).then(function (revisionMatch) {
      if (!revisionMatch) location.reload();
    });
  });
  kintone.events.on([
    'app.record.edit.show',
  ], function (event) {
    revisionCheck(event).then(function (revisionMatch) {
      if (!revisionMatch) {
        location.reload();
        return;
      }
      if (Number(event.record.編集中.value)) {
        if (event.record.編集中.value !== kintone.getLoginUser().id) {
          alert('ほかのユーザーが編集中です．');
          history.back();
          return;
        }
        document.getElementsByClassName('gaia-ui-actionmenu-cancel')[0].addEventListener('click', function () {
          changeState(false).then(function () {
            location.reload();
          })
        })
        window.addEventListener('beforeunload', function (e) {
          changeState(false);
        });
        window.addEventListener('unload', function (e) {
          changeState(false);
        });
      } else {
        changeState(true).then(function () {
          location.reload();
        });
      }
    });
  });
  kintone.events.on([
    'app.record.edit.submit.success',
  ], function (event) {
    changeState(false);
  });
})();