BLOB URL在Safari中不起作用 [英] BLOB URL not working in Safari

问题描述

我正在使用D3生成图形，并希望将其导出为图像，该图像在除Safari之外的所有浏览器中均能正常工作.该代码生成D3 SVG，该D3 SVG在BLOB中用作图像，并在BLOB中用作图像，并添加到可以导出的画布中.

I'am using D3 to generate a graph and want to export this to an image, which works fine in all browsers except Safari. The code generates a D3 SVG, which is used in a BLOB, which is used as an image, which is added to a canvas which can be exported.

var blob = new Blob([source], { type: 'image/svg+xml;charset=utf-8' });
var url = window.URL.createObjectURL(blob);

// Put the svg into an image tag so that the Canvas element can read it in.
var img = d3.select('body').append('img')
 .attr('width', width)
 .attr('height', height)
 .node();

img.onload = function(){
  // Some method which is never called
}
img.src = url;

在Safari中，永远不会触发onload函数，并且image元素也不会显示图像.我同时记录了blob元素和URL，并且看起来都不错(如果我在野生动物园中手动打开blob URL，则会下载SVG代码).但是它不会将其显示为图像，因此我无法导出它.

In Safari, the onload function is never triggered and the image element is also not displaying the image. I logged both the blob element and URL and both seem fine (if i manually open the blob URL in safari it downloads the SVG code). But it won't display it as an image and therefore i can't export it.

我注意到的是，当我检查img元素并在新选项卡中打开src时，它会在URL https://www.mysite.nl/mypage/blob:https://www.mysite.nl/2a173f60-8b34 -4b1c-894b-4ff6adcfe9fa

Something i noticed is that when i inspect the img element and open the src in a new tab it opens on the URL https://www.mysite.nl/mypage/blob:https://www.mysite.nl/2a173f60-8b34-4b1c-894b-4ff6adcfe9fa

因此出于某些原因，Safari将BLOB URL解释为相对的而不是绝对的.有人知道如何解决此问题吗?

So for some reason Safari interprets the BLOB URL as a relative instead of an absolute one. Anyone got an idea on how to fix this?

推荐答案

Safari不喜欢您的Blob的MIME类型.

Safari doesn't like your Blob's MIME Type.

正确的是image/svg+xml字符集标头是无用的，虽然我不确定它实际上是否被允许存在，但还是无用的.

The correct one is image/svg+xml the charset header is useless, and while I'm not sure it's actually allowed to be there, it is anyway useless.

因此从type选项中删除;charset=utf-8部分，就可以了:

So remove the ;charset=utf-8 part from your type option, and you'll be fine:

var blob = new Blob(['<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><rect y="0" width="100" height="100" rx="15" ry="15" x="0"></rect></svg>'], {
  type: 'image/svg+xml' // this is the only MIME for SVG
});
document.body.appendChild(
  new Image()
).src = URL.createObjectURL(blob);

这篇关于BLOB URL在Safari中不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！