HTML5 canvas，使用jspdf.js将canvas转换为PDF [英] HTML5 canvas, convert canvas to PDF with jspdf.js

问题描述

我想在JavaScript中将HTML5 canvas转换为PDF，但我得到一个黑色的背景PDF。我试图改变背景颜色，但仍然得到黑色。下面是我尝试的代码：

I am trying to convert HTML5 canvas to PDF in JavaScript but I get a black background PDF. I tried to change the background color but still get black. The following is code I am trying:

Canvas = document.getElementById("chart");
Context = Canvas.getContext("2d");

var imgData = Canvas.toDataURL('image/jpeg');
var pdf = new jsPDF('landscape');
pdf.addImage(imgData, 'JPEG', 0, 0, 1350, 750);
pdf.save('download.pdf');

如果你有任何想法，我非常感谢。

If you have any idea, I'd appreciate it very much.

推荐答案

一个好方法是使用jspdf.js和html2canvas的组合。我已为你做了一个jsfiddle。

A good approach is to use combination of jspdf.js and html2canvas. I have made a jsfiddle for you.

 <canvas id="canvas" width="480" height="320"></canvas> 
      <button id="download">Download Pdf</button>

'

        html2canvas($("#canvas"), {
            onrendered: function(canvas) {         
                var imgData = canvas.toDataURL(
                    'image/png');              
                var doc = new jsPDF('p', 'mm');
                doc.addImage(imgData, 'PNG', 10, 10);
                doc.save('sample-file.pdf');
            }
        });

jsfiddle： http://jsfiddle.net/rpaul/p4s5k59s/5/

jsfiddle: http://jsfiddle.net/rpaul/p4s5k59s/5/

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