MediaWiki:Common.js

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

(function () {
    function applyWidthMode() {
        var mode = localStorage.getItem('rpgc-width-mode') || 'readable';

        document.body.classList.remove('rpgc-readable-width', 'rpgc-full-width');

        if (mode === 'full') {
            document.body.classList.add('rpgc-full-width');
        } else {
            document.body.classList.add('rpgc-readable-width');
        }

        var button = document.getElementById('rpgc-width-toggle');
        if (button) {
            button.textContent = mode === 'full' ? 'Readable width' : 'Full width';
        }
    }

    function addToggle() {
        if (document.getElementById('rpgc-width-toggle')) {
            return;
        }

        var button = document.createElement('button');
        button.id = 'rpgc-width-toggle';
        button.type = 'button';

        button.addEventListener('click', function () {
            var current = localStorage.getItem('rpgc-width-mode') || 'readable';
            localStorage.setItem('rpgc-width-mode', current === 'full' ? 'readable' : 'full');
            applyWidthMode();
        });

        document.body.appendChild(button);
        applyWidthMode();
    }

    mw.hook('wikipage.content').add(function () {
        addToggle();
    });

    $(addToggle);
})();