User:The wub/tocExpandAll.js

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Documentation for this user script can be added at User:The wub/tocExpandAll. This user script seems to have an accompanying .css page at User:The wub/tocExpandAll.css.

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/* 
Add an expand/collapse all button to the top of the Vector 2022 table of contents
See also https://phabricator.wikimedia.org/T302426

To install add this line:
importScript('User:The wub/tocExpandAllSandbox.js');

to https://en.wikipedia.org/wiki/Special:MyPage/vector-2022.js
*/

$( document ).ready(function () {

    if ( 
        mw.config.get('skin') === 'vector-2022' &&
        document.querySelector('.vector-toc-level-1 ul li') // any subsections?
    ) {
        // Styles copied from .vector-pinnable-header-toggle-button
        const styles = `
.vector-feature-zebra-design-disabled .vector-toc-header-button {
    display: none;
    border: 0;
    padding: 0;
    background-color: transparent;
    color: #3366cc;
    cursor: pointer;
    text-align: left;
}

.vector-feature-zebra-design-disabled .vector-toc-header-button:hover {
    color: #447ff5;
}

.vector-feature-zebra-design-disabled .vector-toc-header-button::before {
    content: '[';
    color: #54595d;
}

.vector-feature-zebra-design-disabled .vector-toc-header-button::after {
    content: ']';
    color: #54595d;
}

.vector-feature-zebra-design-enabled .vector-toc-header-button {
    display: none;
    border: 0;
    padding: 4px 8px;
    background-color: #eaecf0;
    color: #202122;
    cursor: pointer;
    text-align: left;
    font-size: 0.75rem;
    border-radius: 2px;
}

.vector-feature-zebra-design-enabled .vector-toc-header-button:hover {
    background-color: #f8f9fa;
}
        `;

        mw.loader.addStyleTag( styles );

        const expandButton = document.createElement('button');
        expandButton.innerText = 'expand all';
        expandButton.classList.add('vector-toc-header-button', 'vector-toc-expand-all');
        expandButton.addEventListener( 'click', e => {
            document.querySelectorAll('.vector-toc-contents .vector-toc-level-1').forEach( 
                node => node.classList.add('vector-toc-list-item-expanded')
            );
            document.querySelectorAll('.vector-toc-contents [aria-expanded="false"]').forEach(
                node => node.setAttribute('aria-expanded', 'true')
            );
            expandButton.style.display = 'none';
            collapseButton.style.display = 'inline-block';
            collapseButton.focus({ preventScroll: true });
        });
        
        const collapseButton = document.createElement('button');
        collapseButton.innerText = 'collapse all';
        collapseButton.classList.add('vector-toc-header-button', 'vector-toc-collapse-all');
        collapseButton.addEventListener( 'click', e => {
            document.querySelectorAll('.vector-toc-contents .vector-toc-level-1').forEach(
                node => node.classList.remove('vector-toc-list-item-expanded')
            );
            document.querySelectorAll('.vector-toc-contents [aria-expanded="true"]').forEach(
                node => node.setAttribute('aria-expanded', 'false')
            );
            collapseButton.style.display = 'none';
            expandButton.style.display = 'inline-block';
            expandButton.focus({ preventScroll: true });
        });

        // Any already expanded sections?
        if ( document.querySelector('.vector-toc-list-item-expanded ul li') ) {
            expandButton.style.display = 'none';
            collapseButton.style.display = 'inline-block';
        } else {
            expandButton.style.display = 'inline-block';
            collapseButton.style.display = 'none';
        }

        const tocHeader = document.querySelector('.vector-toc-pinnable-header');
        tocHeader.appendChild( expandButton );
        tocHeader.appendChild( collapseButton );

    }
});