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'; } } function calculatePages() { contentHeight = epubContent.scrollHeight; viewerHeight = epubViewer.clientHeight - document.getElementById('epub-navigation').offsetHeight; totalPages = Math.ceil(contentHeight / viewerHeight); updatePageInfo(); } function displayPage(pageNumber) { if (pageNumber >= 0 && pageNumber < totalPages) { epubContent.style.top = `-${pageNumber * viewerHeight}px`; currentPage = pageNumber; updatePageInfo(); } } function updatePageInfo() { pageInfo.textContent = `Page ${currentPage + 1} of ${totalPages}`; } previewButton.addEventListener('click', () => { epubViewer.style.display = 'block'; previewButton.style.display = 'none'; loadContent(); }); prevButton.addEventListener('click', () => displayPage(currentPage - 1)); nextButton.addEventListener('click', () => displayPage(currentPage + 1)); window.addEventListener('resize', () => { if (epubViewer.style.display !== 'none') { calculatePages(); displayPage(currentPage); } });This site requires cookies in order to provide all of its functionality.