gitlab-org--gitlab-foss/app/assets/javascripts/group_label_subscription.js

export default class GroupLabelSubscription {
  constructor(container) {
    const $container = $(container);
    this.$dropdown = $container.find('.dropdown');
    this.$subscribeButtons = $container.find('.js-subscribe-button');
    this.$unsubscribeButtons = $container.find('.js-unsubscribe-button');

    this.$subscribeButtons.on('click', this.subscribe.bind(this));
    this.$unsubscribeButtons.on('click', this.unsubscribe.bind(this));
  }

  unsubscribe(event) {
    event.preventDefault();

    const url = this.$unsubscribeButtons.attr('data-url');

    $.ajax({
      type: 'POST',
      url,
    }).done(() => {
      this.toggleSubscriptionButtons();
      this.$unsubscribeButtons.removeAttr('data-url');
    });
  }

  subscribe(event) {
    event.preventDefault();

    const $btn = $(event.currentTarget);
    const url = $btn.attr('data-url');

    this.$unsubscribeButtons.attr('data-url', url);

    $.ajax({
      type: 'POST',
      url,
    }).done(() => {
      this.toggleSubscriptionButtons();
    });
  }

  toggleSubscriptionButtons() {
    this.$dropdown.toggleClass('hidden');
    this.$subscribeButtons.toggleClass('hidden');
    this.$unsubscribeButtons.toggleClass('hidden');
  }
}