30-seconds-of-php/gatsby-browser.js at master · mikejgurch/30-seconds-of-php · GitHub

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/**
 * Implement Gatsby's Browser APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/browser-apis/
 */

// You can delete this file if you're not using it

let locationScrollTops = [];

const onPreRouteUpdate = ({ location, prevLocation }) => {
  try {
    let scrollTop = document.querySelector('.content').scrollTop;
    locationScrollTops[prevLocation.pathname] = scrollTop;
  }
  catch (e) { }
};

const onRouteUpdate = ({ location, prevLocation }) => {
  try {
    if (locationScrollTops[location.pathname]) {
      document.querySelector('.content').scrollTop = locationScrollTops[location.pathname];
    }
  }
  catch (e) { }
}

export { default as wrapRootElement } from './src/docs/state/ReduxWrapper';
export { onPreRouteUpdate, onRouteUpdate };