明日报表更新

package.json

@@ -16,8 +16,10 @@
     "echarts": "^5.5.0",
     "element-plus": "^2.7.5",
     "file-saver": "^2.0.5",
+    "html2canvas": "^1.4.1",
     "jquery": "^3.7.1",
     "jsencrypt": "^3.3.2",
+    "jspdf": "^2.5.1",
     "less": "^4.2.0",
     "mitt": "^3.0.1",
     "node-sass": "^9.0.0",

src/utils/toPDF.js

+import html2Canvas from 'html2canvas'
+import JsPDF from 'jspdf'
+var noTableHeight = 0 //table外的元素高度
+ 
+export const htmlPdf = (title, html, fileList, type) => {// type传有效值pdf则为横版
+  if (fileList) {
+    const pageHeight = Math.floor(277 * html.scrollWidth / 190) + 20 //计算pdf高度
+    for (let i = 0; i < fileList.length; i++) { //循环获取的元素
+      const multiple = Math.ceil((fileList[i].offsetTop + fileList[i].offsetHeight) / pageHeight) //元素的高度
+      if (isSplit(fileList, i, multiple * pageHeight)) { //计算是否超出一页
+        var _H = '' //向pdf插入空白块的内容高度
+        if (fileList[i].localName !== 'tr') { //判断是不是表格里的内容
+          _H = multiple * pageHeight - (fileList[i].offsetTop + fileList[i].offsetHeight)
+        } else {
+          _H = multiple * pageHeight - (fileList[i].offsetTop + fileList[i].offsetHeight + noTableHeight) + 20
+        }
+        var newNode = getFooterElement(_H)  //向pdf插入空白块的内容
+        const divParent = fileList[i].parentNode // 获取该div的父节点
+        const next = fileList[i].nextSibling // 获取div的下一个兄弟节点
+        // 判断兄弟节点是否存在
+        if (next) {
+          // 存在则将新节点插入到div的下一个兄弟节点之前，即div之后
+          divParent.insertBefore(newNode, next)
+        } else {
+          // 否则向节点添加最后一个子节点
+          divParent.appendChild(newNode)
+        }
+      }
+    }
+  }
+  html2Canvas(html, {
+    allowTaint: false,
+    taintTest: false,
+    logging: false,
+    useCORS: true,
+    dpi: window.devicePixelRatio * 1,
+    scale: 1 // 按比例增加分辨率
+  }).then(canvas => {
+    var pdf = new JsPDF('p', 'mm', 'a4') // A4纸，纵向
+    var ctx = canvas.getContext('2d')
+    var a4w = type ? 277 : 190; var a4h = type ? 190 : 277 // A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
+    var imgHeight = Math.floor(a4h * canvas.width / a4w) // 按A4显示比例换算一页图像的像素高度
+    var renderedHeight = 0
+    while (renderedHeight < canvas.height) {
+      var page = document.createElement('canvas')
+      page.width = canvas.width
+      page.height = Math.min(imgHeight, canvas.height - renderedHeight)// 可能内容不足一页
+ 
+      // 用getImageData剪裁指定区域，并画到前面创建的canvas对象中
+      page.getContext('2d').putImageData(ctx.getImageData(0, renderedHeight, canvas.width, Math.min(imgHeight, canvas.height - renderedHeight)), 0, 0)
+      pdf.addImage(page.toDataURL('image/jpeg', 1.0), 'JPEG', 10, 10, a4w, Math.min(a4h, a4w * page.height / page.width)) // 添加图像到页面，保留10mm边距
+ 
+      renderedHeight += imgHeight
+      if (renderedHeight < canvas.height) {
+        pdf.addPage()// 如果后面还有内容，添加一个空页
+      }
+      // delete page;
+    }
+    // 保存文件
+    pdf.save(title + '.pdf')
+  })
+}
+// pdf截断需要一个空白位置来补充
+const getFooterElement = (remainingHeight, fillingHeight = 0) => {
+  const newNode = document.createElement('div')
+  newNode.style.background = '#ffffff'
+  newNode.style.width = 'calc(100% + 8px)'
+  newNode.style.marginLeft = '-4px'
+  newNode.style.marginBottom = '0px'
+  newNode.classList.add('divRemove')
+  newNode.style.height = (remainingHeight + fillingHeight) + 'px'
+  return newNode
+}
+const isSplit = (nodes, index, pageHeight) => {
+  // 判断是不是tr 如果不是高度存起来
+  // 表格里的内容要特殊处理
+  // tr.offsetTop 是tr到table表格的高度
+  // 所以计算高速时候要把表格外的高度加起来
+  // 生成的pdf没有表格了这里可以不做处理 直接计算就行
+  if (nodes[index].localName !== 'tr') {  //判断元素是不是tr
+    noTableHeight += nodes[index].clientHeight
+  }
+ 
+  if (nodes[index].localName !== 'tr') {
+    return nodes[index].offsetTop + nodes[index].offsetHeight < pageHeight && nodes[index + 1] && nodes[index + 1].offsetTop + nodes[index + 1].offsetHeight > pageHeight
+  } else {
+    return nodes[index].offsetTop + nodes[index].offsetHeight + noTableHeight < pageHeight && nodes[index + 1] && nodes[index + 1].offsetTop + nodes[index + 1].offsetHeight + noTableHeight > pageHeight
+  }
+}
\ No newline at end of file

src/views/Report/ForecastPage.vue

@@ -29,6 +29,7 @@
                 style="min-width: 70px"
                 @click="postHeatForecastFun"
                 class="printHidden"
+                v-show="printHidden"
                 >历史查询</el-button
               >
             </th>
@@ -53,6 +54,7 @@
                 type="primary"
                 style="min-width: 70px"
                 class="printHidden"
+                v-show="printHidden"
                 @click="postPrintHeatForecastFun"
                 >打印查询</el-button
               >
@@ -243,7 +245,7 @@
           </tr>
         </table>
         <div>
-          <div class="btngrounp printHidden">
+          <div class="btngrounp printHidden" v-show="printHidden">
             <el-button
               type="primary"
               v-print="printObj"
@@ -265,6 +267,7 @@
             <el-button
               type="primary"
               style="margin: 15px 0 0 10px"
+              @click="handleExport"
               >导出PDF</el-button
             >
             <router-link to="/RealAnalysis"
@@ -460,6 +463,7 @@ import { saveAs } from "file-saver";
 import XLSX from "xlsx-js-style";
 import { postHeatForecast, postPrintHeatForecast } from "../../api/report";
 import print from "vue3-print-nb";
+import { htmlPdf } from "../../utils/toPDF";
 const temp = ref([]); //24小时室外预测值
 const weather = ref([]); //当日气象信息
 const predTemp = ref([]); //24小时室外体感预测值
@@ -469,6 +473,7 @@ const enertyInfo = reactive({
   printTime: null,
   queryTime: "2024-1-1 09:00:00",
 });
+const printHidden = ref(true);
 const vPrint = print;
 const printObj = {
   id: "printBlock",
@@ -476,6 +481,16 @@ const printObj = {
   extraHead: '<meta http-equiv="Content-Language"content="zh-cn"/>',
   zIndex: 20002,
 };
+const handleExport = (name) => {
+  printHidden.value = false;
+  setTimeout(function () {
+    var fileName = "明日预测报表";
+    const fileList = document.getElementsByClassName("contentBlockInn");
+    htmlPdf(fileName, document.querySelector("#printBlock"), fileList);
+    ElMessage.success("导出成功！请稍后。。。");
+    printHidden.value = true;
+  }, 100);
+};
 function exportTableToExcel() {
   const workbook = XLSX.utils.book_new();
   var ws = XLSX.utils.table_to_sheet(document.getElementById("exlBlock"));