如何以编程方式更改文件输入的 FileList? [英] How to change a file input's FileList programmatically?

问题描述

我有这个 "file" 类型的 input，我想更改它的 files 列表.示例:

I have this input of type "file", and I want to change its files list. Example:

<input type = "file" id = "fileinput" />
<script type = "text/javascript">
  document.getElementById("fileinput").files = [10];
</script>

问题在于未设置 fileinput 元素的 files 列表.我该怎么做?

The problem is that the fileinput element's files list is not set. How do I do it?

推荐答案

出于安全原因，浏览器会阻止 javascript 更改将要上传的文件:只有用户可以通过用户界面选择文件.这是为了防止恶意脚本在用户不知情的情况下上传/etc/passwd.

For security reasons, browsers prevent javascript from changing the files which will be uploaded: only the user can select files via the user interface. This is to prevent an evil script to upload /etc/passwd, for example, without the user knowing.

一个例外是在表单上调用reset"将清除文件或文件列表，但您永远无法以编程方式添加.

The one exception is that calling "reset" on the form will clear the file or filelist, but you can never add to programmatically.

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