使用javascript将png上传到imgur [英] Uploading a png to imgur using javascript
问题描述
我正在尝试使用 Javascript 将 png 上传到imgur 。我直接使用了Imgur API 示例中的代码，但我认为我没有正确传递png文件收到错误消息，说 file.type未定义。我认为该文件没问题，因为我尝试了几个不同的png。我的代码如下：
I'm trying to use Javascript to upload a png to imgur. I've used the code directly from the Imgur API example, but I don't think I am passing the png file properly as I get an error message saying file.type is undefined. I think the file is ok as I've tried this with a few different pngs. My code is as follows:
<html>
<head>
<script type="text/javascript">
function upload(file) {
// file is from a <input> tag or from Drag'n Drop
// Is the file an image?
if (!file || !file.type.match(/image.*/)) return;
// It is!
// Let's build a FormData object
var fd = new FormData();
fd.append("image", file); // Append the file
fd.append("key", "mykey"); // Get your own key: http://api.imgur.com/
// Create the XHR (Cross-Domain XHR FTW!!!)
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://api.imgur.com/2/upload.json"); // Boooom!
xhr.onload = function() {
// Big win!
// The URL of the image is:
JSON.parse(xhr.responseText).upload.links.imgur_page;
}
// Ok, I don't handle the errors. An exercice for the reader.
// And now, we send the formdata
xhr.send(fd);
}
</script>
</head>
<body>
<button type="button" onclick="upload('test.png')">upload to imgur</button>
</body>
</html>
png 文件 test.png 存储在与我的html文件相同的目录中。
The png file test.png is stored in the same directory as my html file.
推荐答案
你的例子正在使用期望您使用输入元素（type = file）上传一些图像。尝试此示例。您可以使用Canvas 这样来访问图像数据。
The example you are using expects that you use input element (type=file) to upload some image. Try this example. You can access image data using a Canvas like this.
总结一下，你需要这样做：
To summarize, you'll need to do this:
- Create new Image with your file (needs to be on local domain)
- Draw the image to a Canvas at onload
- Extract image data using this method
- Pass that data to imgur like here
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