inject id from search params to data-inject-qs elements

inject-id-to-link.html

<script>
  /**
   * To add this to links in the page, add data variable data-inject-qs to the link.
   * For example:
   * <a href="https://google.fi" data-inject-qs>Google</a>
   * 
   * And If current url is /something?hello=world, it will inject ?hello=world to that link
   * It will became https://google.fi?hello=world
   * 
   **/

  waitForElementsPromise("a[data-osko]").then((injectableEls) => {
    const currentSearchParams = new URL(window.location).searchParams;

    const params = Object.fromEntries(currentSearchParams.entries());

    params.id = params.id || window.oskariAttendeeId;

    injectableEls.forEach(function(node) {
      const url = new URL(node.href);
      Object.keys(params).forEach((key) => {
        url.searchParams.set(key, params[key]);
      });
      node.href = url.href;
    });
  });

 </script>