From 7948e4f78b8a9521c6c86dc7b9b6209a87c662a9 Mon Sep 17 00:00:00 2001
From: shaohuzhang1 <80892890+shaohuzhang1@users.noreply.github.com>
Date: Tue, 26 Aug 2025 18:38:58 +0800
Subject: [PATCH] feat: Export conversation page to PDF (#3941)

---
 ui/package.json                        |   2 +
 ui/src/components/pdf-export/index.vue | 146 +++++++++++++++++++++++++
 ui/src/locales/lang/en-US/ai-chat.ts   |   3 +
 ui/src/locales/lang/zh-CN/ai-chat.ts   |   3 +
 ui/src/locales/lang/zh-Hant/ai-chat.ts |   3 +
 ui/src/utils/htmlToPdf.ts              |  56 ----------
 ui/src/views/chat/pc/index.vue         |  13 ++-
 7 files changed, 165 insertions(+), 61 deletions(-)
 create mode 100644 ui/src/components/pdf-export/index.vue
 delete mode 100644 ui/src/utils/htmlToPdf.ts

diff --git a/ui/package.json b/ui/package.json
index c5d6b4668..f391ddaeb 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -32,6 +32,7 @@
     "element-plus": "^2.10.2",
     "file-saver": "^2.0.5",
     "highlight.js": "^11.11.1",
+    "html-to-image": "^1.11.13",
     "html2canvas": "^1.4.1",
     "jspdf": "^3.0.1",
     "katex": "^0.16.10",
@@ -45,6 +46,7 @@
     "recorder-core": "^1.3.25011100",
     "screenfull": "^6.0.2",
     "sortablejs": "^1.15.6",
+    "svg2pdf.js": "^2.5.0",
     "use-element-plus-theme": "^0.0.5",
     "vite-plugin-html": "^3.2.2",
     "vue": "^3.5.13",
diff --git a/ui/src/components/pdf-export/index.vue b/ui/src/components/pdf-export/index.vue
new file mode 100644
index 000000000..6ea6bc5c1
--- /dev/null
+++ b/ui/src/components/pdf-export/index.vue
@@ -0,0 +1,146 @@
+<template>
+  <el-dialog
+    v-model="dialogVisible"
+    :title="$t('chat.preview')"
+    style="overflow: auto"
+    width="80%"
+    :before-close="close"
+    destroy-on-close
+  >
+    <div
+      v-loading="loading"
+      style="height: calc(70vh - 150px); overflow-y: auto; display: flex; justify-content: center"
+    >
+      <div ref="svgContainerRef"></div>
+    </div>
+    <template #footer>
+      <span class="dialog-footer">
+        <el-button :loading="loading" @click="exportPDF">{{ $t('chat.exportPDF') }}</el-button>
+        <el-button
+          :loading="loading"
+          type="primary"
+          @click="
+            () => {
+              loading = true
+              exportJepg()
+            }
+          "
+        >
+          {{ $t('chat.exportImg') }}
+        </el-button>
+      </span>
+    </template>
+  </el-dialog>
+</template>
+<script setup lang="ts">
+import * as htmlToImage from 'html-to-image'
+import { ref, nextTick } from 'vue'
+import html2Canvas from 'html2canvas'
+import { jsPDF } from 'jspdf'
+const loading = ref<boolean>(false)
+const svgContainerRef = ref()
+const dialogVisible = ref<boolean>(false)
+const open = (element: HTMLElement | null) => {
+  dialogVisible.value = true
+  loading.value = true
+  if (!element) {
+    return
+  }
+  setTimeout(() => {
+    nextTick(() => {
+      htmlToImage
+        .toSvg(element, { pixelRatio: 1, quality: 1 })
+        .then((dataUrl) => {
+          return fetch(dataUrl)
+            .then((response) => {
+              return response.text()
+            })
+            .then((text) => {
+              const parser = new DOMParser()
+              const svgDoc = parser.parseFromString(text, 'image/svg+xml')
+              const svgElement = svgDoc.documentElement
+              svgContainerRef.value.appendChild(svgElement)
+              svgContainerRef.value.style.height = svgElement.scrollHeight + 'px'
+            })
+        })
+        .finally(() => {
+          loading.value = false
+        })
+    })
+  }, 1)
+}
+
+const exportPDF = () => {
+  loading.value = true
+  setTimeout(() => {
+    nextTick(() => {
+      html2Canvas(svgContainerRef.value, {
+        logging: false,
+      })
+        .then((canvas) => {
+          const doc = new jsPDF('p', 'mm', 'a4')
+          // 将canvas转换为图片
+          const imgData = canvas.toDataURL(`image/jpeg`, 1)
+          // 获取PDF页面尺寸
+          const pageWidth = doc.internal.pageSize.getWidth()
+          const pageHeight = doc.internal.pageSize.getHeight()
+          // 计算图像在PDF中的尺寸
+          const imgWidth = pageWidth
+          const imgHeight = (canvas.height * imgWidth) / canvas.width
+          // 添加图像到PDF
+          doc.addImage(imgData, 'jpeg', 0, 0, imgWidth, imgHeight)
+
+          // 如果内容超过一页，自动添加新页面
+          let heightLeft = imgHeight
+          let position = 0
+
+          // 第一页已经添加
+          heightLeft -= pageHeight
+
+          // 当内容超过一页时
+          while (heightLeft >= 0) {
+            position = heightLeft - imgHeight
+            doc.addPage()
+            doc.addImage(imgData, 'jpeg', 0, position, imgWidth, imgHeight)
+            heightLeft -= pageHeight
+          }
+
+          // 保存PDF
+          doc.save('导出文档.pdf')
+          return 'ok'
+        })
+        .finally(() => {
+          loading.value = false
+        })
+    })
+  })
+}
+const exportJepg = () => {
+  loading.value = true
+  setTimeout(() => {
+    nextTick(() => {
+      html2Canvas(svgContainerRef.value, {
+        logging: false,
+      })
+        .then((canvas) => {
+          // 将canvas转换为图片
+          const imgData = canvas.toDataURL(`image/jpeg`, 1)
+          const link = document.createElement('a')
+          link.download = `webpage-screenshot.jpeg`
+          link.href = imgData
+          document.body.appendChild(link)
+          link.click()
+          return 'ok'
+        })
+        .finally(() => {
+          loading.value = false
+        })
+    })
+  }, 1)
+}
+const close = () => {
+  dialogVisible.value = false
+}
+defineExpose({ open, close })
+</script>
+<style lang="scss" scoped></style>
diff --git a/ui/src/locales/lang/en-US/ai-chat.ts b/ui/src/locales/lang/en-US/ai-chat.ts
index 4100a079e..42c4e1045 100644
--- a/ui/src/locales/lang/en-US/ai-chat.ts
+++ b/ui/src/locales/lang/en-US/ai-chat.ts
@@ -9,6 +9,9 @@ export default {
   only20history: 'Showing only the last 20 chats',
   question_count: 'Questions',
   exportRecords: 'Export Chat History',
+  exportPDF: 'Export PDF',
+  exportImg: 'Exporting images',
+  preview: 'Preview',
   chatId: 'Chat ID',
   userInput: 'User Input',
   quote: 'Quote',
diff --git a/ui/src/locales/lang/zh-CN/ai-chat.ts b/ui/src/locales/lang/zh-CN/ai-chat.ts
index d725a8c46..88976f169 100644
--- a/ui/src/locales/lang/zh-CN/ai-chat.ts
+++ b/ui/src/locales/lang/zh-CN/ai-chat.ts
@@ -9,6 +9,9 @@ export default {
   only20history: '仅显示最近 20 条对话',
   question_count: '条提问',
   exportRecords: '导出聊天记录',
+  exportPDF: '导出PDF',
+  exportImg: '导出图片',
+  preview: '预览',
   chatId: '对话 ID',
   chatUserId: '对话用户 ID',
   chatUserType: '对话用户类型',
diff --git a/ui/src/locales/lang/zh-Hant/ai-chat.ts b/ui/src/locales/lang/zh-Hant/ai-chat.ts
index 3b5c430e5..530714e02 100644
--- a/ui/src/locales/lang/zh-Hant/ai-chat.ts
+++ b/ui/src/locales/lang/zh-Hant/ai-chat.ts
@@ -9,6 +9,9 @@ export default {
   only20history: '僅顯示最近 20 條對話',
   question_count: '條提問',
   exportRecords: '導出聊天記錄',
+  exportPDF: '匯出PDF',
+  exportImg: '匯出圖片',
+  preview: '預覽',
   chatId: '對話 ID',
   userInput: '用戶輸入',
   quote: '引用',
diff --git a/ui/src/utils/htmlToPdf.ts b/ui/src/utils/htmlToPdf.ts
deleted file mode 100644
index 3a8b21d89..000000000
--- a/ui/src/utils/htmlToPdf.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import html2Canvas from 'html2canvas'
-import jsPDF from 'jspdf'
-
-export const exportToPDF = async (elementId: string, filename = 'document.pdf') => {
-  const element = document.getElementById(elementId)
-  if (!element) return
-  await html2Canvas(element, {
-    useCORS: true,
-    allowTaint: true,
-    logging: false,
-    scale: 2,
-    backgroundColor: '#fff',
-  }).then((canvas: any) => {
-    const pdf = new jsPDF('p', 'mm', 'a4')
-    const pageWidth = 190 // 保留边距后的有效宽度
-    const pageHeight = 277 // 保留边距后的有效高度 //A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
-    const imgHeight = (pageHeight * canvas.width) / pageWidth
-
-    let renderedHeight = 0
-    while (renderedHeight < canvas.height) {
-      const pageCanvas = document.createElement('canvas')
-      pageCanvas.width = canvas.width
-      pageCanvas.height = Math.min(imgHeight, canvas.height - renderedHeight)
-
-      pageCanvas
-        .getContext('2d')!
-        .putImageData(
-          canvas
-            .getContext('2d')!
-            .getImageData(
-              0,
-              renderedHeight,
-              canvas.width,
-              Math.min(imgHeight, canvas.height - renderedHeight),
-            ),
-          0,
-          0,
-        )
-
-      pdf.addImage(
-        pageCanvas.toDataURL('image/jpeg', 1.0),
-        'JPEG',
-        10,
-        10, // 左边距和上边距
-        pageWidth,
-        Math.min(pageHeight, (pageWidth * pageCanvas.height) / pageCanvas.width),
-      )
-
-      renderedHeight += imgHeight
-      if (renderedHeight < canvas.height) {
-        pdf.addPage()
-      }
-    }
-    pdf.save(filename)
-  })
-}
diff --git a/ui/src/views/chat/pc/index.vue b/ui/src/views/chat/pc/index.vue
index 0e83a82a7..c56c57645 100644
--- a/ui/src/views/chat/pc/index.vue
+++ b/ui/src/views/chat/pc/index.vue
@@ -139,7 +139,7 @@
                     <el-dropdown-item @click="exportHTML"
                       >{{ $t('common.export') }} HTML</el-dropdown-item
                     >
-                    <el-dropdown-item @click="exportToPDF('chatListId', currentChatName + '.pdf')"
+                    <el-dropdown-item @click="openPDFExport"
                       >{{ $t('common.export') }} PDF</el-dropdown-item
                     >
                   </el-dropdown-menu>
@@ -169,7 +169,7 @@
         <div class="execution-detail-panel" :resizable="false" collapsible>
           <div class="p-16 flex-between border-b">
             <h4 class="medium ellipsis" :title="rightPanelTitle">{{ rightPanelTitle }}</h4>
-            　
+
             <div class="flex align-center">
               <span v-if="rightPanelType === 'paragraphDocument'" class="mr-4">
                 <a
@@ -217,6 +217,7 @@
       emitConfirm
       @confirm="handleResetPassword"
     ></ResetPassword>
+    <PdfExport ref="pdfExportRef"></PdfExport>
   </div>
 </template>
 
@@ -238,12 +239,14 @@ import ParagraphDocumentContent from '@/components/ai-chat/component/knowledge-s
 import HistoryPanel from '@/views/chat/component/HistoryPanel.vue'
 import { cloneDeep } from 'lodash'
 import { getFileUrl } from '@/utils/common'
-import { exportToPDF } from '@/utils/htmlToPdf'
+import PdfExport from '@/components/pdf-export/index.vue'
 useResize()
-
+const pdfExportRef = ref<InstanceType<typeof PdfExport>>()
 const { common, chatUser } = useStore()
 const router = useRouter()
-
+const openPDFExport = () => {
+  pdfExportRef.value?.open(document.getElementById('chatListId'))
+}
 const isCollapse = ref(false)
 const isPcCollapse = ref(false)
 watch(