问题描述
代替使用 input type =file html标记，是否可以显示选择要上传的文件 input type =button？c $ c>对话框。然后，当从中选择一个文件时，选择要上传的文件对话框，文件路径将被插入到常规html input type =text 标记？
Instead of using an input type="file" html tag, is it possible to bring up a choose a file to upload dialog box by clicking a input type="button"? Then when a file is selected from the choose a file to upload dialog box, the file path gets inserted into a regular html input type="text" tag?
我好像gmail做了类似的事情，但没有按钮和文本输入，它们只是有一个链接添加文件或类似的东西。点击该链接时，它会显示选择要通过mail.google.com 对话框上传的文件。当文件被点击时，文件名会显示在屏幕上。
I've seem that gmail does something similar but not with buttons and text inputs, they simply have a link add file or something like that. When that link is clicked, it shows the select file(s) to upload by mail.google.com dialog box. When a file is clicked, the file name is shown on the screen.
他们是怎么做的？
How are they doing that?
推荐答案
我认为大多数浏览器为了安全目的而锁定了这个。按钮和文本框可以通过JavaScript进行操作。文件输入框不能，并且有很好的理由;想象一下，如果一个javascript可以打开一个对话框，将路径设置为系统中的敏感文件，然后模拟按钮点击下载文件！
I think most browsers have this locked down for security purposes. Buttons and text boxes can be manipulated via JavaScript. File input boxes cannot, and for good reason; imagine if a javascript could open a dialog, set the path to a sensitive file on your system, then simulate the button click to download the file!
顺便说一下，如果你正在寻找样式，或许这会起作用：
By the way, if you are looking to style it, perhaps this would work: http://www.quirksmode.org/dom/inputfile.html
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