Twenty Twenty-One: Anchor link on the same page causes the menu button icon to turn upside down

[joelbermudez]

As reported and requested in ​https://wordpress.org/support/topic/menu-button-auto-scrolls-to-top-when-pressed-scroll-to-top-change-button-icon/.

If you have an anchor link on the same page, the icon turs upside down.
Example. In website.com/one/ if you add a link to website.com/one/#anchor, this will cause the issue. An example will be a scroll to top button as in the report mentioned.

Video showing (the bug report is for the second option. The first one was solved too in the report, but may not be the best solution, and, as the theme is not prepared to have a fixed header, and the problem is that when clicking the menu button, it automatically scrolls to the top, may not be relevant, but you can check on the report mentioned at first).

In the video you can see in 0:09 when I click "ARRIBA", that is a scroll to top in casael.com using casael.com/#inicio

​https://youtu.be/zW7R58KM_BA

Problem is in primary-navigation.js

document.addEventListener( 'click', function( event ) {
            // If target onclick is <a> with # within the href attribute
            if ( event.target.hash && event.target.hash.includes( '#' ) ) {
                wrapper.classList.remove( id + '-navigation-open', 'lock-scrolling' );
                twentytwentyoneToggleAriaExpanded( mobileButton );
                // Wait 550 and scroll to the anchor.
                setTimeout(function () {
                    var anchor = document.getElementById(event.target.hash.slice(1));
                    anchor.scrollIntoView();
                }, 550);
            }
        }

Possible Solution:

Change

document.addEventListener( 'click', function( event ) {

to

document.querySelector('.primary-menu-container').addEventListener( 'click', function( event ) {

The function was being activated all the time, and that function should only work when the mobile menu is open. Now, you can use #anchors to move on the same page off the menu without “glitching” the menu icon.

That change is tested and working without any problems.

[sabernhardt]

Thanks for the report!

Related: #53331