Question

我正在尝试使用 jsPDF 创建一个包含JavaScript的PDF文件。我有一个小测试页面。基本上我有一个下载PDF按钮，它从一个范围中获取base64图像并将其用于imgData。然后我尝试将addImage图像数据转换为pdf，然后保存。一切似乎都有效，它会生成PDF并提示下载。但是，当我尝试使用xpdf或Foxit阅读器查看PDF时，我被告知PDF已损坏。 我是否错误地创建了这个PDF？我的网页很长，所以我把它放在Pastebin上。

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />   
<script type="text/javascript" src="js/jquery/jquery-1.7.1.min.js"></script>
<script type="text/javascript" src="js/jquery/jquery-ui-1.8.17.custom.min.js"></script>
<script type="text/javascript" src="../jspdf.js"></script>
<script type="text/javascript" src="../libs/FileSaver.js/FileSaver.js"></script>
<script type="text/javascript" src="../libs/BlobBuilder.js/BlobBuilder.js"></script>
<script type="text/javascript" src="../jspdf.plugin.addimage.js"></script>
<script type="text/javascript" src="../jspdf.plugin.standard_fonts_metrics.js"></script>
<script type="text/javascript" src="../jspdf.plugin.split_text_to_size.js"></script>
<script type="text/javascript" src="../jspdf.plugin.from_html.js"></script>
<script type="text/javascript" src="js/basic.js"></script>
<title>Sup!</title>
<script>
function changeCan() {
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  ctx.fillStyle="#FF0000";
  ctx.fillRect(0,0,128,128);
}
function changeCan3() {
  var c = document.getElementById("myCanvas");
  var ctx = c.getContext("2d");
  ctx.fillStyle="#FFFFFF";
  ctx.fillRect(0,0,128,128);
  var image = new Image();
  image.src = document.getElementById("3span").innerHTML;
  ctx.drawImage(image,0,0);
}
function changeCan4() {
  var imgData = document.getElementById("3span").innerHTML;
  window.alert(imgData.length);
  var doc = new jsPDF();
  doc.addImage(imgData, 'JPEG', 15, 40, 128, 128);
  doc.save('Test.pdf');
}
</script>
</head>
<body>
  Yo!<hr>
  <canvas id="myCanvas" width="128" height="128"></canvas><hr>
  <button type="button" onClick="changeCan()">Change Me To Red!</button>
  <button type="button" onClick="changeCan3()">Change Me To Span!</button>
  <button type="button" onClick="changeCan4()">Download Me!</button>
  <hr>
  <span id="3span" style="display:none;">B64 DATA HERE</span>
</body>
</html>

Answer 1

我有类似的问题，这就是如何解决它。我使用了Blob.js，canvas-toBlob，FileSaver。我还注意到最新的BlobBuilder.min.js无法正常工作，所以我使用了BlobBuilder.js。

var content = canvas.toDataURL('image/jpeg');
var doc = new jsPDF('landscape');
doc.addImage(content, 'JPEG', 0, 0);

var data = doc.output();
var buffer = new ArrayBuffer(data.length);
var array = new Uint8Array(buffer);

for (var i = 0; i < data.length; i++) {
    array[i] = data.charCodeAt(i);
}

var blob = new Blob(
    [array],
    {type: 'application/pdf', encoding: 'raw'}
);

saveAs(blob, filename);

Answer 2

使用 png 图片类型时出现类似问题：使用Adobe Reader打开时PDF已损坏。

将其更改为 jpeg 解决了它！

// Before : Corrupted PDF file when opened with Adobe Reader
var imgData = canvas.toDataURL('image/png');
var doc = new jsPDF('p', 'mm');
doc.addImage(imgData, 'png', 0, 0, 210, 295);

// After : Working
var imgData = canvas.toDataURL('image/jpeg');
var doc = new jsPDF('p', 'mm');
doc.addImage(imgData, 'jpeg', 0, 0, 210, 295);

Answer 3

我使用了jsPDF的1.3.4版本并且它有效

<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.4/jspdf.min.js"></script>

jsPDF损坏的PDF？

3 个答案: