将输入文件值设置为第二个输入文件 [英] Set input file value to second input file

问题描述

注意：

答案&下面的评论反映了2009年旧版浏览器的状态。现在，您可以在2017年使用JavaScript动态/编程地设置文件输入元素的值。

查看答案此问题的详细信息以及演示：
如何以编程方式设置文件输入值（即：何时拖放文件）？

我有2 input type =file

 < input type =fileid =attach_file_1name =attach_file_1/> 
< input type =fileid =attach_file_2name =attach_file_2/> 
  

在为 attach_file_1 选择文件后，可以使用javascript为 attach_file_2 设置相同的值？

解决方案

我不认为你可以。我相信这是一个安全问题。您无法设置文件输入类型的值。否则，您可以隐藏文件输入元素，并在用户不知情的情况下将文件上传到您的服务器。

Note:

The answers & comments below reflect the state of legacy browsers in 2009. Now you can actually set the value of the file input element dynamically/programatically using JavaScript in 2017.

See the answer in this question for details as well as a demo:
How to set file input value programatically (i.e.: when drag-dropping files)?

I have 2 input type="file"

<input type="file" id="attach_file_1" name="attach_file_1" />
<input type="file" id="attach_file_2" name="attach_file_2" />

after "choosing" file for attach_file_1, there is possible to set same value for attach_file_2 using javascript ?

解决方案

I don't think you can. I believe it's a security issue. You can't set the value of a file input type. Otherwise you could hide the file input element and upload a file to your server without the user's knowledge.

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