Question

I’ve successfully stored data using FILESYSTEM API provided by HTML5. But I don’t know where I could identify the file in my local repository so that I can backup the data I stored. I have also check my root directory of application in the server (Tomcat 7.0), but I couldn’t find the file. While using chrome developer tools, I checked the data is storing successfully.

The Code goes like this:

 window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;

            function onInitFs(fs)
            {
                fs.root.getFile('fpslog.txt', {create: false}, function(fileEntry) {

                        // Create a FileWriter object for our FileEntry (log.txt).
                        fileEntry.createWriter(function(fileWriter) {

                          fileWriter.seek(fileWriter.length); // Start write position at EOF.

                             fileWriter.onwriteend = function(e) {
                              console.log('Write completed.');
                            };

                              fileWriter.onerror = function(e) {
                              console.log('Write failed: ' + e.toString());
                            };

                          // Create a new Blob and write it to log.txt.
                          var blob = new Blob(['Hello World'], {type: 'text/plain'});

                          fileWriter.write(blob);

                        }, errorHandler);

                      }, errorHandler);

            }

            window.requestFileSystem(window.TEMPORARY, 5*1024*1024 /*5MB*/, onInitFs, errorHandler);

and the ERROR function:

function errorHandler(e) {
                  var msg = '';

                  switch (e.code) {
                    case FileError.QUOTA_EXCEEDED_ERR:
                      msg = 'QUOTA_EXCEEDED_ERR';
                      break;
                    case FileError.NOT_FOUND_ERR:
                      msg = 'NOT_FOUND_ERR';
                      break;
                    case FileError.SECURITY_ERR:
                      msg = 'SECURITY_ERR';
                      break;
                    case FileError.INVALID_MODIFICATION_ERR:
                      msg = 'INVALID_MODIFICATION_ERR';
                      break;
                    case FileError.INVALID_STATE_ERR:
                      msg = 'INVALID_STATE_ERR';
                      break;
                    default:
                      msg = 'Unknown Error';
                      break;
                  };

                  console.log('Error: ' + msg);
                }

In developer tools, I did see no error print rather it is saying ‘write completed’, which means i’m able to create file somewhere and storing the data. I want to get to access that data to view. As already the tutorial mentioned, I don’t see any file created in root folder. Any Help Please.

Answer 1

You can also view the files using the root directory’s filesystem: URL. Open
filesystem:<YOUR_ORIGIN>/temporary/ in the address bar, replacing with the origin your app is running off of (e.g. “http://stackoverflow.com”).

You can also enable “FileSystem inspection” in the DevTools under experiments. This may also require you to “Enable Experimental DevTools features” in about:flags.