Angular 5 : Allow trailing slash in routes

Question

I'm updating an old website with Angular, and one of the requirements I have to meet is that all routes should remain the same as they were (For SEO purposes).

Many of the old website's routes finish with a slash (Like /my/route/), and some of them finish with a .html, like /my/route.html.

The issue is that routerLink deletes the final slash in every route finishing by a slash (My route is now /my/route).

How can I make routerLink to keep the trailing slash ?

A light example can be seen here : AngularTrailingSlash.

Answer 1

I added below to your app.module.ts

import {Location, PathLocationStrategy} from '@angular/common';


const _orig_prepareExternalUrl = PathLocationStrategy.prototype.prepareExternalUrl;

PathLocationStrategy.prototype.prepareExternalUrl = function(internal) {
  const url = _orig_prepareExternalUrl.call(this, internal);

  if (url === '') {
    return url;
  }

  console.log('For ' + internal + ' we generated ' + url);
  if (url.endsWith('.html')) {
      return url;
  }

  if (url.endsWith('/')) {
    return url;
  }


  return url + '/';

};

Location.stripTrailingSlash = function (url) {
    const /** @type {?} */ match = url.match(/#|\?|$/);
    const /** @type {?} */ pathEndIdx = match && match.index || url.length;
    const /** @type {?} */ droppedSlashIdx = pathEndIdx - (url[pathEndIdx - 1] === '/' ? 1 : 0);
    const first = url.slice(0, droppedSlashIdx);
    const last = url.slice(pathEndIdx);

    if (first.endsWith('.html')) {
        return first + last;
    }

    return first + '/' + last;

};

And it now works for me with a trailing slash when .html is not there