MediaWiki:Common.js

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$(document).ready(function() {
    // Function to toggle the collapse
    function toggleSidebarCategory(category) {
        $('#' + category + ' > .body').slideToggle();
        $('#' + category + ' > .head').toggleClass('collapsed');
    }

    // Add toggle link to each category header
    $('#mw-panel .portal > h3').each(function() {
        var category = $(this).parent().attr('id');
        $(this).addClass('head').click(function() { toggleSidebarCategory(category); });
    });

    // Hide all categories by default
    $('#mw-panel .portal > .body').hide();
    $('#mw-panel .portal > h3').addClass('collapsed');
});