如何使用 JavaScript 创建和保存文本文件

Question

Do you know any cross-browser method to create and save a file with JavaScript on the client-side?

Considerations:

1. I can't save it on the server because the file is going to be read from a fiscal printer.
2. The server can't access the client. This is obvious because we are talking about a web application in the web, so the server can't access a client folder.
3. New ActiveXObject("Scripting.FileSystemObject"); is ONLY for Internet Explorer and even then not for all versions.
4. We are talking about printing on a fiscal printer, so I can't ask the cashier in the supermarket to download the text file and save it in a folder where the fiscal printer can read it.
5. If not JavaScript, what else can I use in my ASP, .Net 4.0, C# web application?

Answer 1

Basically, you said it, "we are talking about a web application." Do you know any web applications that save a file to your hard drive (besides cookies) without showing you a download prompt first?

Having said that, browsers have started to offer a persistence API that goes beyond cookies. (See, for example, this article .) But such a solution wouldn't meet your requirement of being cross-browser.

Answer 2

Your only options are to use persistance APIs from HTML5 or to create a browser plugin (activex control on IE, NPAPI plugin on others) that can do the file access for you. You could use FireBreath to do this, and it would be relatively simple if you know C++.

That said, it is a really dangerous idea; it is difficult to prevent people from using your plugin in other pages, so your plugin has to somehow be smart enough to keep itself from being abused by malicious sites that want to read (or even write) arbitrary data to your hard drive.

There is, after all, a reason why browsers don't natively support this. I'd look at HTML5.

Answer 3

we came out with a simple windows service nodejs app to be installed in the local machine. When the web application need to create a file it just sends an API call to this app using localhost and that will write the file for it. Cheers.

Answer 4

你可以通过客户端 Web 服务来做到这一点，只需在 Web 服务中创建一个函数，在你的硬盘驱动器中创建一个文本文件，然后当你这样做时，将 Web 服务转换为客户端服务 .Net 框架制作一个客户端 java 脚本然后您将能够在客户端使用 Java 脚本调用服务器端函数，之后您的文件将不会发布在服务器中，它将继续保存在您的硬盘驱动器中