Access Local Files with Local Javascript [duplicate]

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灰色年华

2021-01-04 13:05
Yes, although insecure, you can use:
```
fopen("c:\\MyFile.txt", 'r');
```
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暖寄归人

2021-01-04 13:06

This will only work on IE, but if that is not a problem for you, here is some sample code to write to a file:

    var fso, s;
    fso = new ActiveXObject("Scripting.FileSystemObject");
    s = fso.OpenTextFile("c:\\path\\to\\myfile.txt" , 8, 1, -2);
    s.writeline("Hello World");
    s.Close();

And then to read from it:

f = fso.OpenTextFile(filename, ForReading);
while (!f.AtEndOfStream) {
    var r = f.ReadLine();
    document.write (r + "<br />");
}
f.Close();

For more information about OpenTextFile, check out: http://msdn.microsoft.com/en-us/library/314cz14s(VS.85).aspx

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南方客

2021-01-04 13:06

This worked for me in Firefox...

Adapted code from this site: http://www.h-online.com/security/services/Firefox-Mozilla-Demo-Reading-local-files-via-local-HTML-files-761851.html

<HTML>

<BODY onLoad="ReadFileContent()" >

<iframe id="local_file" name="local_file" 
    src="file:///C:/test.txt"
    height=0 width=0>
</iframe>

<script>

function ReadFileContent(){

alert(local_file.document.firstChild.innerHTML);

}

</script>

<h2>Read Local File</h2>

<P>
If a window displays the content of your local file C:\test.txt
the demo worked. If no additional window appears, it failed. You can
close this window now.</p>

</body>

</html>

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天命终不由人

2021-01-04 13:10

You could read the files using just an Ajax request, as though it was to the server. But you have to know the name of the file, and you can't write files.

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遇见更好的自我

2021-01-04 13:14

If people are to drop a json string in to a folder, you could just have it be a plain text file, then use an AJAX call to the file name, just like you would point it to a php/asp script. I do this all the time for testing of pages before I have the backend done.

I.E. if your page were C:\foo\index.html, you could have them drop to C:\foo\putyourstuff\json.txt here and run an AJAX call "putyourstuffhere/json.txt".

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执念已碎

2021-01-04 13:18
According to the Firefox documentation, the following code will work:
```
var req = new XMLHttpRequest();  
req.open('GET', 'file:///home/user/file.json', false);   
req.send(null);  
if(req.status == 0)  
  dump(req.responseText);
```
I seem to recall it only works within the same directory as the HTML page. And I don't know if this will work in other browsers.
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