overleaf/services/web/frontend/js/directives/bookmarkableTabset.js

import _ from 'lodash'
import App from '../base'
App.directive('bookmarkableTabset', $location => ({
  restrict: 'A',
  require: 'tabset',
  link(scope, el, attrs, tabset) {
    const _makeActive = function(hash) {
      if (hash && hash !== '') {
        const matchingTab = _.find(
          tabset.tabs,
          tab => tab.bookmarkableTabId === hash
        )
        if (matchingTab) {
          matchingTab.select()
          return el.children()[0].scrollIntoView({ behavior: 'smooth' })
        }
      }
    }

    scope.$applyAsync(function() {
      // for page load
      const hash = $location.hash()
      _makeActive(hash)

      // for links within page to a tab
      // this needs to be within applyAsync because there could be a link
      // within a tab to another tab
      const linksToTabs = document.querySelectorAll('.link-to-tab')
      const _clickLinkToTab = event => {
        const hash = event.currentTarget
          .getAttribute('href')
          .split('#')
          .pop()
        _makeActive(hash)
      }

      if (linksToTabs) {
        Array.from(linksToTabs).map(link =>
          link.addEventListener('click', _clickLinkToTab)
        )
      }
    })
  }
}))

App.directive('bookmarkableTab', $location => ({
  restrict: 'A',
  require: 'tab',
  link(scope, el, attrs, tab) {
    const tabScope = el.isolateScope()
    const tabId = attrs.bookmarkableTab
    if (tabScope && tabId && tabId !== '') {
      tabScope.bookmarkableTabId = tabId
      tabScope.$watch('active', function(isActive, wasActive) {
        if (isActive && !wasActive && $location.hash() !== tabId) {
          return $location.hash(tabId)
        }
      })
    }
  }
}))