Some assistance needed from devs

[Cocainee Vendetta]

Right peeps, I need help with two things. First one is a brainer, second: a technical.

Tags: Javascript, Cordova, Filesystem.

I'm after the best 'data' (or data's) to compare while checking if an update is available for a file. Possibly the file size but what if the file format has changed or just one character has changed and so it happens, the file size stays the same (don't even know if this is possible) ? Is this a reliable method?

Spoiler (hover to show)

Code: [Select]

if(localFileSize !== remoteFileSize) {
  // Update avaiable
}


Case: An API call to a CMS which retrieves posts where there is a file download available (not limited to): PDF, Docx, Spreadsheet, Video.

Spoiler (hover to show)

Output:

Code: [Select]

{
  "created":"1474367606", //Date the post was created
  "changed":"1474367606", //Last modified on server (post not file)
  ...
  "file":[{
    "fid":"10",
    "uid":"1",
    "filename":"somedoc.pdf",
    "uri":"public://somedoc.pdf",
    "filemime":"application/pdf",
    "filesize":"384518",
    "status":"1",
    "timestamp":"1474367606"
  }]
}

File meta on device:

Code: [Select]

{
  end: 384518
  lastModified: 1474381344000 //Last modified on device
  lastModifiedDate: 1474381344000
  localURL: "cdvfile://localhost/persistent/myapp/somedoc.pdf"
  name: "somedoc.pdf"
  size: 384518
  start: 0
  type: null
}


Secondly - Skip if you have no JS/Cordova knowledge...

I can't access onprogress property of Cordova File Transfer! I can't see anything wrong with my code - Uploaded a 250MB file to test as I have a very fast down speed.

Spoiler (hover to show)

Code: [Select]

window.requestFileSystem  = window.requestFileSystem || window.webkitRequestFileSystem;
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, download, fail);

function download(fileSystem){
    var path = fileSystem.root.toURL();
    var fileURL = path + config.appDirName + '/' + filename + '.' + extension;
    var localpath = path + config.appDirName + '/' + filename + '.' + extension;
    fileURL = encodeURI(fileURL);

    var fileTransfer = new FileTransfer();
                                       
    fileTransfer.onprogress = function(progressEvent) {
        console.log('progressing..');
        if (progressEvent.lengthComputable) {
            var percent = progressEvent.loaded / progressEvent.total * 100;
            percent = Math.round(percent);
            $('#progress-'+documentsArticle.id).val(percent);
             console.log('Perc: ', percent);
        } else {
            console.log('loading');
        }
    };

    fileTransfer.download(
        downloadurl,
        fileURL,
        function(entry) {   
            console.log('Download complete: ' + entry.toURL());
            ...
    },
    function(failed) {
        console.log('Download failed: ', failed);
        ...
    },
    true
    );
}