使用javascript，客户端打开文件

Question

In my application I want to open a file that exists on a client machine. I created two applications: desktop and web application. When the user installs the desktop application there are some files which is copied to its installation path, and I want to open those files from my web application via javascript.

Answer 1

The browser is insulated from the host machine (sandboxed) for security reasons.

The only way for the browser to access local files (apart from those inside the sandbox, ie. cookies and cache) is the HTML file control used by the user explicitly.

Answer 2

Unfortunately JavaScript doesn't have access to the client's file structure. You could use something like Adobe AIR for your web application though maybe?

http://www.adobe.com/devnet/air/flex/articles/exploring_file_capabilities.html

Answer 3

The browser is sandboxed against that very scenario. If you can open your own files using JavaScript, who's to stop me from opening your files using JavaScript.

The usual way to solve this problem is by using an ActiveX component and interacting with it through JavaScript. This will limit you to IE though.

Answer 4

正如Oded上面提到的那样，出于安全原因，它是不可能的，如果你已经在客户端机器上安装了一个应用程序，那么你可以将参数传递给它并执行应用程序，在这种情况下你可以将文件的URI传递给应用程序，以便它在他们的机器上打开，但我无法在浏览器中看到它发生。

Answer 5

what about this?

<script>
var oRequest;

if(document.all) {
   // Internet Explorer
   oRequest = new ActiveXObject("Microsoft.XMLHTTP")
}
else {
   // Mozilla
   oRequest = new XMLHttpRequest();
}


oRequest.open("GET", "file:///C:/myLocalFile.txt", false);
oRequest.send(null);
textToBeWritten = oRequest.responseText;

document.write(textToBeWritten);
</script>