toDataURL（）返回不正确的网址

我试图从我的流星站点创建一个页面的pdf。该页面包含相当多的样式和一些D3图表。我添加了chipcastledotcom:jspdf和new3rs:html2canvas来完成我的目标。toDataURL（）返回不正确的网址

我的计划是使用加上jsPDF的.addImage()功能html2canvas的图表添加到PDF。作为实现我的目标的第一步，我试图把在网页（标识）的现有图像，绘制它到一个新创建的canvas元素，然后里面html2canvas，呼吁canvas.toDataURL('image/jpg')然后我作为jsPDF的.addImage()函数的参数使用。

最终，徽标图像将我通过转换我的D3图表img元素创建图像所取代。我的问题是生成pdf，但图像是空白的。

我不认为这是在图像上的负载问题，因为图像清晰的网页上可见之前我所说的PDF生成作为该网站的用户精心之前。

我得到的数据网址如下。的=在传输数据的URL我碰到toDataURL()回来不看我完全正确的（虽然我真的不知道会发生什么）结束：

data:image/png;base64,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

是否有修复/解决这个问题或者我不了解toDataURL()？

这里是一个的jsfiddle（完美的作品），演示了什么，我试图完成：https://jsfiddle.net/jdcast/tqfdkusp/。

注意，我碰到这个以前的SO问题跌跌撞撞有关类似/相同的问题，但它似乎没有有一个决议：canvas.toDataURL() not working properly

谢谢！

来源

2016-01-07 Darth Hexamal

我真的不明白你的问题。 Dataurl是否工作？如果您删除了=，它会起作用吗？如果它有效，那么这个jsfiddle怎么处理它呢？ –

我实际上并不知道toDataURL是否正在工作。因为我没有很多关于这方面的线索，所以我无法确定toDataURl在我的代码或其他东西中是否无法正常工作。要回答你的其他问题，当我删除=时它不起作用。小提琴的重点是演示相同的代码可以在小提琴中工作，但无论如何，它不适用于我的网页中已经创建和可用的图像。 –

缺乏这是一个非常难回答的问题，因为我真的不知道问题是什么。尝试缩小范围或发布代码，以查找无法正常工作的图像。因为这个问题不起作用。 –

Html2canvas有时不适用于DOM中有很多元素的HTML（对它支持的元素数量有限制）。分析整个DOM元素。

在这种情况下canvas.toDataURL（）总是返回空白图像。

来源

2016-02-02 12:32:45

toDataURL（）返回不正确的网址

回答

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