javascript 如何使用javascript上传文件？
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How to upload a file using javascript?
提问by Manjeet Kumar Nai
I want to create an uploader with js. Can anyone help me how to upload a file using javascript?
我想用js创建一个上传器。谁能帮助我如何使用javascript上传文件？
回答by Firemen26
You can use html5 file type like this:
您可以像这样使用 html5 文件类型：
<input type="file" id="myFile">
You file will be in value:
您的文件将有价值：
var myUploadedFile = document.getElementById("myFile").files[0];
For more information see https://www.w3schools.com/jsref/dom_obj_fileupload.asp
有关更多信息，请参阅https://www.w3schools.com/jsref/dom_obj_fileupload.asp
and see example here: https://www.script-tutorials.com/pure-html5-file-upload/
并在此处查看示例：https: //www.script-tutorials.com/pure-html5-file-upload/
回答by Rik
You can upload files with XMLHttpRequestand FormData. The example below shows how to upload a newly selected file(s).
您可以使用XMLHttpRequest和上传文件FormData。下面的示例显示了如何上传新选择的文件。
<input type="file" name="my_files[]" multiple/>
<script>
const input = document.querySelector('input[type="file"]');
input.addEventListener('change', (e) => {
const fd = new FormData();
// add all selected files
e.target.files.forEach((file) => {
fd.append(e.target.name, file, file.name);
});
// create the request
const xhr = new XMLHttpRequest();
xhr.onload = () => {
if (xhr.status >= 200 && xhr.status < 300) {
// we done!
}
};
// path to server would be where you'd normally post the form to
xhr.open('POST', '/path/to/server', true);
xhr.send(fd);
});
</script>
Disclaimer, I'm the author of FilePondand this is very similar to how it does uploading as well.
免责声明，我是FilePond的作者，这与它的上传方式非常相似。
