MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
// Add Expand/Collapse All button
$(document).ready(function() {
    // Create the button
    var $toggleButton = $('<button>', {
        text: 'Collapse All',
        class: 'toggle-all-button',
        click: function() {
            var $button = $(this);
            var isCollapsed = $button.text() === 'Expand All';

            // Toggle all sections
            $('#mw-navigation .mw-portlet .mw-portlet-body').toggle(!isCollapsed);
            $('#mw-navigation .mw-portlet .collapsible-arrow').text(isCollapsed ? '▼' : '▶');

            // Update button text
            $button.text(isCollapsed ? 'Collapse All' : 'Expand All');
        }
    });

    // Add the button to the sidebar
    $('#mw-navigation').prepend($toggleButton);
});