fix: 修复滚动同步位置计算+添加调试日志

static/css/style.css

@@ -121,6 +121,27 @@ body {
     background: white;
 }
 
+.translated-page {
+    padding-bottom: 30px;
+    border-bottom: 2px dashed #ddd;
+    margin-bottom: 20px;
+}
+
+.translated-page:last-child {
+    border-bottom: none;
+}
+
+.page-header {
+    font-size: 0.9em;
+    padding: 5px 10px;
+    background: #f0f0f0;
+    border-radius: 3px;
+}
+
+.page-content {
+    padding: 10px;
+}
+
 /* 会员卡片 */
 .pricing-card {
     transition: transform 0.3s ease;

templates/translation.html

@@ -79,6 +79,8 @@
         // 切换对比视图
         let syncScrollEnabled = true;
         let pdfDoc = null;
+        let pagePositions = [];  // PDF各页位置
+        let translatedPagePositions = [];  // 译文各页位置
         
         document.getElementById('toggleCompare').addEventListener('click', async function() {
             showCompare = !showCompare;
@@ -88,39 +90,49 @@
                     const response = await fetch(`/api/compare/${translationId}`);
                     const result = await response.json();
                     
-                    // 原文面板：如果有PDF URL用PDF.js渲染，否则显示提取的文本
+                    // 原文面板：如果有PDF URL用PDF.js渲染
                     let originalHtml = '';
                     if (result.original_pdf_url) {
-                        originalHtml = '<canvas id="pdfCanvas"></canvas><div id="pdfPages"></div>';
+                        originalHtml = '<div id="pdfPages"></div>';
                     } else if (result.original && result.original.length > 0) {
                         originalHtml = `<div class="original-text" style="white-space:pre-wrap;font-family:monospace;">${escapeHtml(result.original)}</div>`;
                     } else {
                         originalHtml = '<div class="text-muted">原文内容未找到（可能PDF已被删除）</div>';
                     }
                     
+                    // 译文按页渲染
+                    let translatedHtml = renderTranslatedByPage(result.translated);
+                    
                     document.getElementById('resultContent').innerHTML = `
                         <div class="compare-container">
                             <div class="compare-panel original" id="originalPanel">
-                                <h5>原文 PDF</h5>
+                                <h5>原文 PDF <small class="text-muted">(共${result.pages.length}页)</small></h5>
                                 <div id="pdfContainer">${originalHtml}</div>
                             </div>
                             <div class="compare-panel translated" id="translatedPanel">
-                                <h5>译文</h5>
-                                <div class="translated-content">${renderMarkdown(result.translated)}</div>
+                                <h5>译文 <small class="text-muted">(共${result.pages.length}页)</small></h5>
+                                <div class="translated-content">${translatedHtml}</div>
                             </div>
                         </div>
                         <div class="text-center mt-2">
-                            <small class="text-muted">💡 左右滚动同步，方便逐页对比</small>
+                            <small class="text-muted">💡 滚动任意一侧，另一侧自动同步到对应页</small>
                         </div>
                     `;
                     
-                    // 如果有PDF，用PDF.js渲染
-                    if (result.original_pdf_url) {
-                        renderPDF(result.original_pdf_url);
-                    }
+                    // 先计算译文位置（因为已经渲染好了）
+                    setTimeout(calculateTranslatedPositions, 100);
                     
-                    // 启用滚动同步
-                    setTimeout(enableSyncScroll, 300);
+                    // 如果有PDF，用PDF.js渲染，完成后计算位置并启用同步
+                    if (result.original_pdf_url) {
+                        renderPDF(result.original_pdf_url).then(() => {
+                            setTimeout(() => {
+                                calculatePdfPositions();
+                                enableSyncScroll();
+                            }, 200);
+                        });
+                    } else {
+                        setTimeout(enableSyncScroll, 300);
+                    }
                     
                 } catch (error) {
                     alert('加载对比失败: ' + error.message);
@@ -130,48 +142,136 @@
             }
         });
         
-        // PDF.js渲染PDF
+        // 译文按页渲染
+        function renderTranslatedByPage(content) {
+            if (!content) return '<div class="text-muted">译文加载失败</div>';
+            
+            // 解析分页 - 按 "---" 分隔
+            const parts = content.split(/\n\n---\n\n/);
+            let html = '';
+            
+            parts.forEach((part, index) => {
+                // 提取页码
+                const pageNumMatch = part.match(/## 第 (\d+) 页\n\n/);
+                const pageNum = pageNumMatch ? pageNumMatch[1] : (index + 1);
+                
+                // 移除页码标题
+                let contentOnly = part.replace(/## 第 \d+ 页\n\n/, '').replace(/^# .*\n\n/, '').replace(/^> .*\n\n/, '');
+                
+                html += `
+                    <div class="translated-page" data-page="${pageNum}">
+                        <div class="page-header text-center text-muted mb-3">— 第 ${pageNum} 页 —</div>
+                        <div class="page-content">${renderMarkdown(contentOnly)}</div>
+                    </div>
+                `;
+            });
+            
+            return html;
+        }
+        
+        // PDF.js渲染PDF（返回Promise）
         async function renderPDF(url) {
             pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
             
-            try {
-                const pdf = await pdfjsLib.getDocument(url).promise;
-                pdfDoc = pdf;
+            const pdf = await pdfjsLib.getDocument(url).promise;
+            pdfDoc = pdf;
+            
+            const container = document.getElementById('pdfPages');
+            container.innerHTML = '';
+            
+            // 渲染所有页面
+            for (let i = 1; i <= pdf.numPages; i++) {
+                // 页码标识
+                const pageNumDiv = document.createElement('div');
+                pageNumDiv.className = 'page-header text-center text-muted mb-2';
+                pageNumDiv.textContent = `— 第 ${i} 页 —`;
+                pageNumDiv.dataset.page = i;
+                container.appendChild(pageNumDiv);
                 
-                const container = document.getElementById('pdfPages');
-                container.innerHTML = '';
+                const page = await pdf.getPage(i);
+                const canvas = document.createElement('canvas');
+                canvas.className = 'pdf-page-canvas';
+                canvas.style.width = '100%';
+                canvas.style.display = 'block';
+                canvas.style.marginBottom = '20px';
+                canvas.dataset.page = i;
                 
-                // 渲染所有页面
-                for (let i = 1; i <= pdf.numPages; i++) {
-                    const page = await pdf.getPage(i);
-                    const canvas = document.createElement('canvas');
-                    canvas.className = 'pdf-page-canvas';
-                    canvas.style.width = '100%';
-                    canvas.style.display = 'block';
-                    canvas.style.marginBottom = '20px';
-                    
-                    const context = canvas.getContext('2d');
-                    const viewport = page.getViewport({ scale: 1.5 });
-                    
-                    canvas.height = viewport.height;
-                    canvas.width = viewport.width;
-                    
-                    await page.render({
-                        canvasContext: context,
-                        viewport: viewport
-                    }).promise;
-                    
-                    container.appendChild(canvas);
-                    
-                    // 添加页码标识
-                    const pageNum = document.createElement('div');
-                    pageNum.className = 'text-center text-muted mb-3';
-                    pageNum.textContent = `— 第 ${i} 页 —`;
-                    container.appendChild(pageNum);
+                const context = canvas.getContext('2d');
+                const viewport = page.getViewport({ scale: 1.5 });
+                
+                canvas.height = viewport.height;
+                canvas.width = viewport.width;
+                
+                await page.render({
+                    canvasContext: context,
+                    viewport: viewport
+                }).promise;
+                
+                container.appendChild(canvas);
+            }
+            
+            return pdf;
+        }
+        
+        // 计算译文各页位置（相对于滚动容器顶部）
+        function calculateTranslatedPositions() {
+            translatedPagePositions = [];
+            const translatedPanel = document.getElementById('translatedPanel');
+            const translatedPages = document.querySelectorAll('.translated-page');
+            
+            translatedPages.forEach(el => {
+                const page = parseInt(el.dataset.page);
+                // 使用getBoundingClientRect计算相对位置
+                const rect = el.getBoundingClientRect();
+                const panelRect = translatedPanel.getBoundingClientRect();
+                // 相对位置 = 元素top - 容器top + 当前scrollTop
+                const relativeTop = rect.top - panelRect.top + translatedPanel.scrollTop;
+                translatedPagePositions.push({
+                    page: page,
+                    top: relativeTop
+                });
+            });
+            
+            console.log('译文页位置:', translatedPagePositions);
+        }
+        
+        // 计算PDF各页位置（相对于滚动容器顶部）
+        function calculatePdfPositions() {
+            pagePositions = [];
+            const originalPanel = document.getElementById('originalPanel');
+            const pdfPages = document.querySelectorAll('#pdfPages .page-header');
+            
+            pdfPages.forEach(el => {
+                const page = parseInt(el.dataset.page);
+                // 使用getBoundingClientRect计算相对位置
+                const rect = el.getBoundingClientRect();
+                const panelRect = originalPanel.getBoundingClientRect();
+                // 相对位置 = 元素top - 容器top + 当前scrollTop
+                const relativeTop = rect.top - panelRect.top + originalPanel.scrollTop;
+                pagePositions.push({
+                    page: page,
+                    top: relativeTop
+                });
+            });
+            
+            console.log('PDF页位置:', pagePositions);
+        }
+        
+        // 根据滚动位置找当前页
+        function findCurrentPage(scrollTop, positions) {
+            for (let i = positions.length - 1; i >= 0; i--) {
+                if (scrollTop >= positions[i].top - 30) {
+                    return positions[i].page;
                 }
-            } catch (error) {
-                document.getElementById('pdfContainer').innerHTML = 
-                    '<div class="text-danger">PDF加载失败: ' + error.message + '</div>';
+            }
+            return 1;
+        }
+        
+        // 滚动到指定页
+        function scrollToPage(panel, positions, pageNum) {
+            const pos = positions.find(p => p.page === pageNum);
+            if (pos) {
+                panel.scrollTop = pos.top - 10;
             }
         }
         
@@ -180,22 +280,27 @@
             const originalPanel = document.getElementById('originalPanel');
             const translatedPanel = document.getElementById('translatedPanel');
             
-            if (!originalPanel || !translatedPanel) return;
+            if (!originalPanel || !translatedPanel || pagePositions.length === 0 || translatedPagePositions.length === 0) {
+                console.log('滚动同步未启用: 缺少元素或位置数据');
+                return;
+            }
+            
+            console.log('滚动同步已启用');
             
             originalPanel.addEventListener('scroll', function() {
                 if (!syncScrollEnabled) return;
+                const currentPage = findCurrentPage(this.scrollTop, pagePositions);
                 syncScrollEnabled = false;
-                const ratio = this.scrollTop / (this.scrollHeight - this.clientHeight);
-                translatedPanel.scrollTop = ratio * (translatedPanel.scrollHeight - translatedPanel.clientHeight);
-                setTimeout(() => syncScrollEnabled = true, 50);
+                scrollToPage(translatedPanel, translatedPagePositions, currentPage);
+                setTimeout(() => syncScrollEnabled = true, 100);
             });
             
             translatedPanel.addEventListener('scroll', function() {
                 if (!syncScrollEnabled) return;
+                const currentPage = findCurrentPage(this.scrollTop, translatedPagePositions);
                 syncScrollEnabled = false;
-                const ratio = this.scrollTop / (this.scrollHeight - this.clientHeight);
-                originalPanel.scrollTop = ratio * (originalPanel.scrollHeight - originalPanel.clientHeight);
-                setTimeout(() => syncScrollEnabled = true, 50);
+                scrollToPage(originalPanel, pagePositions, currentPage);
+                setTimeout(() => syncScrollEnabled = true, 100);
             });
         }