MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
mw.loader.using(['mediawiki.util', 'jquery']).then(function () {
    $(document).ready(function () {
        var banner = $('#wiki-banner'); // Select the banner
        var closeButton = $('#close-banner'); // Select the close button

        if (!banner.length || !closeButton.length) return; // Exit if elements are missing

        // Check if the banner was closed before
        if (sessionStorage.getItem("bannerClosed") !== "true") {
            banner.show(); // Show only if not closed before
        }

        // Close banner on click and remember state for session
        closeButton.on("click", function () {
            banner.hide();
            sessionStorage.setItem("bannerClosed", "true");
        });
    });
});