MediaWiki:Vector.js

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/* All JavaScript here will be loaded for users of the Vector skin */

    var categorySection = $('#p-Categories');

    if (!categorySection.length) {
        return;
    }

    var categoryTitle = categorySection.find('.vector-menu-heading');

    categoryTitle.css({
        'cursor': 'pointer',
        'user-select': 'none'
    });

    categoryTitle.on('click', function () {
        categorySection.toggleClass('categories-open');
    });