debian-mirror-gitlab/app/assets/javascripts/signin_tabs_memoizer.js

/* eslint no-param-reassign: ["error", { "props": false }]*/
/* eslint no-new: "off" */
import AccessorUtilities from './lib/utils/accessor';

/**
 * Memorize the last selected tab after reloading a page.
 * Does that setting the current selected tab in the localStorage
 */
export default class SigninTabsMemoizer {
  constructor({ currentTabKey = 'current_signin_tab', tabSelector = 'ul.nav-tabs' } = {}) {
    this.currentTabKey = currentTabKey;
    this.tabSelector = tabSelector;
    this.isLocalStorageAvailable = AccessorUtilities.isLocalStorageAccessSafe();

    this.bootstrap();
  }

  bootstrap() {
    const tabs = document.querySelectorAll(this.tabSelector);
    if (tabs.length > 0) {
      tabs[0].addEventListener('click', (e) => {
        if (e.target && e.target.nodeName === 'A') {
          const anchorName = e.target.getAttribute('href');
          this.saveData(anchorName);
        }
      });
    }

    this.showTab();
  }

  showTab() {
    const anchorName = this.readData();
    if (anchorName) {
      const tab = document.querySelector(`${this.tabSelector} a[href="${anchorName}"]`);
      if (tab) {
        tab.click();
      }
    }
  }

  saveData(val) {
    if (!this.isLocalStorageAvailable) return undefined;

    return window.localStorage.setItem(this.currentTabKey, val);
  }

  readData() {
    if (!this.isLocalStorageAvailable) return null;

    return window.localStorage.getItem(this.currentTabKey);
  }
}