Check whether .txt file exists or not in the folder using javascript function.If file exists reload the page automatically

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Hi,

I would like to check the whether the .txt file exists or not in the particular folder using Javascript.If text file exists Then I would to like to reload the page.

Please send me the sample code for this scenario.

Thanks!

Posted 15-Jan-16 8:52am

priya9826

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Richard Deeming 15-Jan-16 15:08pm

Where is the file located? If it's on the client, then you cannot access it from Javascript running in a browser.

priya9826 19-Jan-16 12:30pm

Text file is located on the server Side.

Richard Deeming 19-Jan-16 12:35pm

Then Ryan's answer (Solution 1) is correct - you need to call some code running on the server to check the file.

As I mentioned in your other related question, don't pass the path of the file into the service; have it hard-coded or stored in a server-side configuration file. You don't want hackers to be able to check random files anywhere on the server! :)

priya9826 19-Jan-16 12:40pm

Could you please send me the sample code which use jQuery's .ajax() method to Check whether .txt file exists or not in the folder.If file exists reload the page automatically?

Richard Deeming 19-Jan-16 12:45pm

The code depends on whether the file can be downloaded, and what server-side language you're using.

If you can download the file, then something like this would work:
$.ajax("path/to/the/file.txt").done(function(){ /* File exists */ }).fail(function(){ /* File doesn't exist */ });

If you can't download the file, then you'll need to write some server-side code to check whether it exists.

Sergey Alexandrovich Kryukov 15-Jan-16 22:16pm

Where this JavaScript is hosted?
—SA

priya9826 19-Jan-16 12:31pm

index.htm on server

priya9826 19-Jan-16 12:39pm

Could you please send me the sample code which use jQuery's .ajax() method to Check whether .txt file exists or not in the folder.If file exists reload the page automatically?

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ZurdoDev · Answer 1 · 2016-01-15T09:26:00

As Richard mentioned, JavaScript cannot access the local client's PC's file system. That would be a huge security risk.

However, if you are referring to the server then you can use jQuery's .ajax() method, jQuery.ajax() | jQuery API Documentation[^] to call a webservice that checks the file system on the server and returns an appropriate response.

Note, if you are checking the server you'll need to make sure the account shown as the identity of the application pool in IIS will need permissions to the file system or else it checking will always return false.