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html2canvas 页面生成pdf并上传
来源:TP课堂 时间:2024-03-25 点击:778

这篇文章(https://www.tpketang.com/article/101.html)适合没有图片的,那么有页面中有图片呢?

尽量用https协议


<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>html2canvas Example</title>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.3.2/html2canvas.min.js"></script>
  <script type="text/javascript" src="/static/index/js/jquery-3.4.1.min.js"></script>

  <script type="text/javascript"
    src="https://lf6-cdn-tos.bytecdntp.com/cdn/expire-1-M/jspdf/1.0.272/jspdf.min.js"></script>
</head>

<body>

  <div id="capture" style="padding: 10px; background: #f5da55">
    <img
      src="data:image/png;base64,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"
      alt="Example Image" style="width: 100px;">
    <p>Hello, this is a sample text.</p>
  </div>

  <button onclick="capture()">Capture</button>

  <script>
    function capture() {
      const element = document.getElementById('capture'); // 指定需要生成图片的DOM元素
      html2canvas(element, {
        allowTaint: true,
        foreignObjectRendering: true
      }).then(canvas => {
        console.log(canvas)
        var contentWidth = canvas.width;
        var contentHeight = canvas.height;

        //一页pdf显示html页面生成的canvas高度;
        var pageHeight = contentWidth / 841.89 * 592.28;


        //未生成pdf的html页面高度
        var leftHeight = contentHeight;
        //页面偏移
        var position = 0;
        //a4纸的尺寸[595.28,841.89],html页面生成的canvas在pdf中图片的宽高
        //var imgWidth = 595.28;
        //var imgHeight = 592.28/contentWidth * contentHeight;
        var imgWidth = 841.89;
        var imgHeight = 841.89 / contentWidth * contentHeight;

        var pageData = canvas.toDataURL('image/jpeg', 1.0);
        //l表示横版,p:纵向 (默认纵向)
        var pdf = new jsPDF('l', 'pt', 'a4');

        //有两个高度需要区分,一个是html页面的实际高度,和生成pdf的页面高度(841.89)
        //当内容未超过pdf一页显示的范围,无需分页
        if (leftHeight < pageHeight) {
          pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
        } else {
          while (leftHeight > 0) {
            pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
            leftHeight -= pageHeight;
            //position -= 841.89;
            position -= 595.28;
            //避免添加空白页
            if (leftHeight > 0) {
              pdf.addPage();
            }
          }
        }

        pdf.save("mood_board.pdf");
        // 将pdf输入为base格式的字符串
        var buffer = pdf.output("datauristring")
        // 将base64格式的字符串转换为file文件
        var myfile = dataURLtoFile(buffer, "mood_board.pdf")
        name = upload_pdf(myfile)
      })



    }


    upload_pdf = function (file) {
      var order_id = 1;
      var formdata = new FormData()
      formdata.append("file", file); // 文件对象
      formdata.append("order_id", order_id);
      //多个参数的情况
      // formdata.append("name", name);
      var msg = '';
      // 之后ajax传递数据
      $.ajax({
        url: "/index/upload",                      //url地址
        type: 'POST',                 //上传方式
        data: formdata,                   // 上传formdata封装的数据
        dataType: 'JSON',
        cache: false,                  // 不缓存
        async: false,                   // 开启的异步 保证返回信息
        processData: false,            // jQuery不要去处理发送的数据
        contentType: false,            // jQuery不要去设置Content-Type请求头
        success: function (data) {
          if (data.status == 0) {
            //var url= data.url;
            //跳转pdf界面 uploadUrl为服务器地址
            window.open(uploadUrl + url)
          } else {
            layer.alert("文件上传失败");
          }
        },
        error: function (data) {           //失败回调
          layer.msg('数据不能为空', { icon: 5 });
          console.log(data);
        }
      });
      //返回值
      //return url;
    };


    //将base64转换为文件对象
    function dataURLtoFile(dataurl, filename) {
      var arr = dataurl.split(',');
      var mime = arr[0].match(/:(.*?);/)[1];
      var bstr = atob(arr[1]);
      var n = bstr.length;
      var u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      //转换成file对象
      return new File([u8arr], filename, { type: mime });
      //转换成成blob对象
      //return new Blob([u8arr],{type:mime});
    }
  </script>
</body>

</html>