MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
(function () {
    function weightedChoose(container) {
        const options = [...container.querySelectorAll(".gadget-choose-option")];

        const weights = options.map(el => parseFloat(el.dataset.weight ?? 1));
        const total = weights.reduce((sum, w) => sum + w, 0);

        let random = Math.random() * total;
        const chosen = options.find((_el, i) => (random -= weights[i]) < 0);

        options.forEach(el => el.style.display = "none");
        chosen.style.display = "";
    }

    document.querySelectorAll(".gadget-choose").forEach(weightedChoose);
})();