scroll-tracker.js

import Mixin from '@ember/object/mixin';
import { inject as service } from '@ember/service';
import config from 'ember-api-docs/config/environment';
import getOffset from 'ember-api-docs/utils/get-offset';

export default Mixin.create({
  scrollPositionReset: service(),

  actions: {
    willTransition(transition) {
      this.scrollPositionReset.scheduleReset(transition);
    },

    didTransition() {
      this._super();
      if (
        typeof FastBoot === 'undefined' &&
        window.location.search === '?anchor='
      ) {
        let elem = document.querySelector('#methods');

        if (elem && elem.offsetHeight) {
          const offsetToScroll = getOffset(
            elem,
            config.APP.scrollContainerSelector
          );
          const scrollContainer = document.querySelector(
            config.APP.scrollContainerSelector
          );
          if (scrollContainer.scrollTo) {
            scrollContainer.scrollTo(0, offsetToScroll - 10);
          } else {
            // fallback for IE11
            scrollContainer.scrollTop = offsetToScroll - 10;
          }
          return;
        }
      }
      this.scrollPositionReset.doReset();
    },
  },
});