MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

$(document).ready(function () {
    const username = mw.config.get('wgTitle');

    $.getJSON(`/w/api.php?action=query&list=users&ususers=${encodeURIComponent(username)}&usprop=groups&format=json`, function (data) {
        if (data && data.query && data.query.users && data.query.users.length > 0) {
            const user = data.query.users[0];
            const groups = user.groups;

            const groupsString = groups.join(", ");

            const displayElement = $("#user-rights-display");

            if (displayElement.length > 0) {
                displayElement.text(groupsString);
            } else {
                $("body").prepend(`<div id="user-rights-display">User rights: ${groupsString}</div>`);
            }
        }
    });
});