cordova-file-cache

Super Awesome File Cache for Cordova Apps

Based on cordova-promise-fs.

Getting started

  # fetch code using bower
  bower install cordova-file-cache cordova-promise-fs
  # ...or npm...
  npm install cordova-file-cache cordova-promise-fs

  # install Cordova and plugins
  cordova platform add ios
  cordova plugin add cordova-plugin-file
  cordova plugin add cordova-plugin-file-transfer # optional

IMPORTANT: For iOS, use Cordova 3.7.0 or higher (due to a bug that affects requestFileSystem).

Or just download and include CordovaPromiseFS.js and CordovaFileCache.js

Usage

Initialize & configuration

// Initialize a Cache
var cache = new CordovaFileCache({
  fs: new CordovaPromiseFS({ // An instance of CordovaPromiseFS is REQUIRED
      Promise: Promise // <-- your favorite Promise lib (REQUIRED)
  }),
  mode: 'hash', // or 'mirror', optional
  localRoot: 'data', //optional
  serverRoot: 'http://yourserver.com/files/', // optional, required on 'mirror' mode
  cacheBuster: false  // optional
});

cache.ready.then(function(list){
    // Promise when cache is ready.
    // Returns a list of paths on the FileSystem that are cached.
})

• CordovaPromiseFS is REQUIRED!
• You need to include a Promise library when creating a CordovaPromiseFS. Any library that follows the A+ spec will work. For example: bluebird or promiscuous.
• mode: "mirror": Mirrors the file structure from serverRoot at localRoot.
• mode: "hash": Filename is hash of server url (plus extension).
• CordovaPromiseFS() is an instance of cordova-promise-fs.
• cacheBuster appends a timestamp to the url ?xxxxxx to avoid the network cache.

Add files to the cache

// First, add files
cache.add('http://yourserver.com/folder/photo1.jpg')
cache.add('folder/photo2.jpg')  // automatically prepends the `severRoot`
cache.add(['photo3.jpg','photo4.jpg'])

// Now the cache is dirty: It needs to download.
cache.isDirty() === true
// cache.add also returns if the cache is dirty.
var dirty = cache.add(['photo3.jpg'])

// Downloading files.
// The optional 'onprogress' event handler is enhanced with information
// about the total download queue.
// It is recommended to avoid heavy UI and animation while downloading.
//
// The optional 'includeFileProgress' defaults to "false".
// When set to "true", you will also receive progress events from individual file tranfers.
//
// "false" is recommended as sending many FileTransfer progress events from native to JS can
// slow down performance.
var onprogress = function(e) {
  var progress ="Progress: "
  + e.queueIndex // current download index
  + " "
  + e.queueSize; // total files to download

// Download files.
cache.download(onprogress,includeFileProgress).then(function(cache){ ... },function(failedDownloads) { ... })

}

Use the cache

// Get the cached internalURL of the file: "cdvfile://localhost/persisent/cache/photo3.jpg"
cache.get('photo3.jpg');           
cache.toInternalURL('photo3.jpg');
cache.toInternalURL('http://yourserver.com/photo3.jpg');

// Get the file URL of the file: "file://.../photo3.jpg";
cache.toURL('photo3.jpg');

// When file is not cached, the server URL is returned as a fallback.
cache.get('http://yoursever.com/never-cached-this.jpg') === 'http://yoursever.com/never-cached-this.jpg'
cache.get('never-cached-this.jpg') === 'http://yoursever.com/never-cached-this.jpg'

// Get Base64 encoded data URL.
cache.toDataURL('photo3.jpg').then(function(base64){},function(err){});

Other functions

// Abort all downloads
cache.abort()

// Clear cache (removes localRoot directory)
cache.clear().then( ... )

// Or remove a single file
cache.remove('photo3.jpg').then( ... )

// Returns path on Cordova Filesystem, i.e. "/cache/photo3.jpg"
cache.toPath('photo3.jpg');      

// Returns server URL to download, i.e. "http://yourserver.com/photo3.jpg";
cache.toServerURL('photo3.jpg');

// Needs a download?
cache.isDirty();

// Returns a list of server URLs that need to be downloaded.
cache.getDownloadQueue();        

 // Return a list of paths that are cached (i.e. ["/cache/photo3.jpg"])
cache.list().then(function(list){...},function(err){...})

Changelog

1.2.2 - bugfixes

• When download is ready, fail if there are no errors instead of fail if cache is dirty (again)

1.2.0

• Return errors when not all files are loaded instead of empty array

1.1.0

• Update cordova-promise-fs to 1.1.0
• Default download progress events only updates on download finished (performance boost!)

1.0.0

• Update to cordova-promise-fs 1.0.0

0.14.0 (07/02/2016)

• Handle REST api calls better (thanks @xontab)
• Fix download onprogress index

0.13.0 (23/01/2016)

• Fix download onprogress index

0.12.0 (18/03/2015)

• Export hash function as CordovaFileCache.hash (needed by App Loader)

0.11.0 (17/03/2015)

• Update CordovaPromiseFS dependency.
• Fix some errors in README

0.10.0 (21/12/2014)

• Update CordovaPromiseFS dependency

0.9.0 (21/12/2014)

• Bugfix with cacheBuster

0.8.0 (28/11/2014)

• Normalized path everywhere.

0.7.0 (27/11/2014)

• Added tests and fixed few minor bugs

0.6.0 (19/11/2014)

• Bugfix: changes to "get" and "toInternalURL" methods.
• Bugfix: LocalRoot should NOT start with a slash (Android)

0.5.0 (15/11/2014)

• Bugfix: Make sure cache returns a valid server URL if file is not cached.

0.4.0 (13/11/2014)

• Added Chrome Support!

0.3.0 (09/11/2014)

• Added cacheBuster option.

0.2.0 (07/11/2014)

• Many small bugfixes
• Upgraded the build process with webpack

0.1.0 (06/11/2014)

Contribute

Convert CommonJS to a browser-version:

npm install webpack -g
npm run-script prepublish

Feel free to contribute to this project in any way. The easiest way to support this project is by giving it a star.

Contact

• @markmarijnissen
• http://www.madebymark.nl
• [email protected]

© 2014 - Mark Marijnissen