pwa-helpers/router.js

/**
@license
Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
/**
  Basic router that calls a callback whenever the location is updated.

  Example:

      import { installRouter } from 'pwa-helpers/router.js';

      installRouter((location) => handleNavigation(location));

  For example, if you're using this router in a Redux-connected component,
  you could dispatch an action in the callback:

      import { installRouter } from 'pwa-helpers/router.js';
      import { navigate } from '../actions/app.js';

      installRouter((location) => store.dispatch(navigate(location)))

  If you need to force a navigation to a new location programmatically, you can
  do so by pushing a new state using the History API, and then manually
  calling the callback with the new location:

      window.history.pushState({}, '', '/new-route');
      handleNavigation(window.location);

  Optionally, you can use the second argument to read the event that caused the
  navigation. For example, you may want to scroll to top only after a link click.

      installRouter((location, event) => {
        // Only scroll to top on link clicks, not popstate events.
        if (event && event.type === 'click') {
          window.scrollTo(0, 0);
        }
        handleNavigation(location);
      });
*/
export const installRouter = (locationUpdatedCallback) => {
    document.body.addEventListener('click', e => {
        if (e.defaultPrevented || e.button !== 0 ||
            e.metaKey || e.ctrlKey || e.shiftKey)
            return;
        const anchor = e.composedPath().filter(n => n.tagName === 'A')[0];
        if (!anchor || anchor.target ||
            anchor.hasAttribute('download') ||
            anchor.getAttribute('rel') === 'external')
            return;
        const href = anchor.href;
        if (!href || href.indexOf('mailto:') !== -1)
            return;
        const location = window.location;
        const origin = location.origin || location.protocol + '//' + location.host;
        if (href.indexOf(origin) !== 0)
            return;
        e.preventDefault();
        if (href !== location.href) {
            window.history.pushState({}, '', href);
            locationUpdatedCallback(location, e);
        }
    });
    window.addEventListener('popstate', e => locationUpdatedCallback(window.location, e));
    locationUpdatedCallback(window.location, null /* event */);
};
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