DirExists Method
Checks if a directory exists on the server.
Syntax
ftpclient.dirExists(remoteDir, [callback])
Callback
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
function(err, data){ }
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'data' is the value returned by the method.
'err' has 2 properties which hold detailed information:
err.code err.message
Remarks
Use this method to check if the RemoteDir exists on the server.
The test is performed by attempting to change the current directory to RemoteDir, and checking the response code returned by the server.
Note that this method will return false if the directory does exist but is not accessible for the client (e.g. due to a permission issue).