Lock body Scrolling and restore scroll position on unlock

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Wed Mar 10 2021 10:26:07 GMT+0000 (Coordinated Universal Time)

function toggleScrollLock(open) {
    var offset = window.scrollY;
    var body = document.querySelector('body');

    if (open) {
        // Fix the body when menu is open
        body.classList.add('fixed');
        body.style.top = `-${offset}px`;
    } else {
        // Scroll back to original position upon close
        const scrollY = document.body.style.top;
        body.classList.remove('fixed');
        body.style.top = '';
        window.scrollTo(0, parseInt(scrollY || '0') * -1);
    }
}

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Lock body Scrolling and restore scroll position on unlock

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