如何更改文件输入的文件列表 [英] how to change the file input's filelist

问题描述

我有类型file的这个 input ，我想改变它的文件列表。示例：



 < input type =fileid =fileinput/> 
< script type =text / javascript> 
 document.getElementById（fileinput）。files = [10]; 
< / script> 
  
 $ b 
问题在于 fileinput 元素的文件 code> list is not set。
解决方案
出于安全原因，浏览器阻止javascript改变将被上传的文件：只有用户可以通过用户界面选择文件，这是为了防止邪恶的脚本上传 / etc / passwd ，例如，没有用户知道。
 
 
有一个例外是在表单上调用reset会清除文件或文件列表，但不能以编程方式添加。
 
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>
The problem is that the fileinput element's files list is not set. How do I do it?
解决方案
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.

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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