MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
$(document).ready(function() {
    // Wait for the page to load
    $(window).on('load', function() {
        // Check if we're on the search page
        if ($('.search-types').length) {
            // Select the tab you want as default
            // Options: 'Content pages', 'Multimedia', 'Everything'
            var defaultTab = 'Content pages';
            
            // Find and click the tab
            $('.search-types').find('a:contains("' + defaultTab + '")').click();
        }
    });
});