User:Macaw*/noRefListAlert.js Source: en.wikipedia.org/wiki/User:Macaw*/noRefListAlert.js

// <nowiki>
mw.hook('wikipage.content').add(function($content) {
    if (mw.config.get('wgAction') !== 'view') {
        return;
    }
    if (mw.config.get('wgIsRedirect')) {
        return;
    }
    if (mw.config.get('wgArticleId') === 0) {
        return;
    }

    var ns = mw.config.get('wgNamespaceNumber');
    var title = mw.config.get('wgTitle').replace(/_/g, ' ');
    if (title === 'Main Page') {
        return;
    }

    var isValidNamespace = (ns === 0 || ns === 118);
    var rawHTML = $content.html().toLowerCase();

    // Check if there is a <references tag anywhere or a <ref tag.
    var hasReferencesTag = rawHTML.indexOf('<references') !== -1 || rawHTML.indexOf('<ref') !== -1 || rawHTML.indexOf('{{reflist}}';

    // For {{reflist ...}}: look for the starting substring and then check for the closing "}}".
    var startPos = rawHTML.indexOf('{{reflist');
    var hasReflistTemplate = false;
    if (startPos !== -1) {
        var endPos = rawHTML.indexOf('}}', startPos);
        if (endPos !== -1) {
            hasReflistTemplate = true;
        }
    }

    if (isValidNamespace && !(hasReferencesTag || hasReflistTemplate)) {
        var warningMessage = document.createElement('div');
        warningMessage.style.backgroundColor = '#ffcc00';
        warningMessage.style.color = '#000';
        warningMessage.style.padding = '10px';
        warningMessage.style.fontSize = '16px';
        warningMessage.style.fontWeight = 'bold';
        warningMessage.style.position = 'relative';
        warningMessage.style.zIndex = '1000';
        warningMessage.style.marginBottom = '20px';
        warningMessage.innerHTML = 'Warning: This page does not contain a references section.';

        var $firstHeading = $('#firstHeading');
        if ($firstHeading.length) {
            $firstHeading.after(warningMessage);
        }
    }
});
// </nowiki>