MediaWiki:SoloArtistChallenge.js

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$(function() {

    var user = document.querySelector('[title="Your user page \[.\]').innerText;

    var anchorsWithTitles = document.querySelectorAll('a[title]');

    anchorsWithTitles.forEach(function(anchor) {
        // Only continue if this is an anchor tag for a solo artist challenge mob
        if (!anchor.previousSibling || !anchor.previousSibling.style || anchor.previousSibling.style.fontSize !== '21px') return;

        // If this is a solo artist <a>
        var mob = anchor.title;
        var mobId = anchor.title.replace(/ /g, '-');
        var mobBeatList = document.getElementById(mobId);
        if (!mobBeatList) return;

        var userBeatMob = (mobBeatList.innerText +',').includes(user + ',');
//console.log(mob, mobId, mobBeatList.innerText, user, userBeatMob)
        if (!userBeatMob) return;

        document.querySelector('[title="'+ mob + '"]').previousSibling.innerText = 'X';
    });
});