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angular-offline

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Offline support for AngularJS applications.

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# angular-offline

# This plugin is no longer actively maintained, you can still use it but issues will not be resolved. If you want the npm name, you can contact me by email.

[![Build Status](https://travis-ci.org/neoziro/angular-offline.svg?branch=master)](https://travis-ci.org/neoziro/angular-offline)
[![Dependency Status](https://david-dm.org/neoziro/angular-offline.svg?theme=shields.io)](https://david-dm.org/neoziro/angular-offline)
[![devDependency Status](https://david-dm.org/neoziro/angular-offline/dev-status.svg?theme=shields.io)](https://david-dm.org/neoziro/angular-offline#info=devDependencies)

Offline support for AngularJS applications.

## Install

### Using npm

```
npm install angular-offline
```

### Using bower

```
bower install angular-offline
```

## Usage

```js
module.run(function (offline, $http) {
  offline.start($http);

$http.get('/test.json', {offline: true})
  .then(...);
});
```

### $http

Puting the offline flag to true in $http config will have for effect to activate the angular cache for this request and to add offline behaviour to the request.

### offlineProvider.debug(value)

Start or stop debug mode. It adds a lot of additional logs to understand how offline works.

```js
module.config(function (offlineProvider) {
  offlineProvider.debug(true);
});
```

### offline.start(requester)

Start offline with the requester ($http). Usually you will call this method in `.run` of your application.

```js
module.run(function (offline, $http) {
  offline.start($http);
});
```

### offline.stackCache

Specify a cache to use to stack requests (POST, PUT, DELETE...).

```js
module.run(function (offline, $cacheFactory) {
  offline.stackCache = $cacheFactory('custom-cache');
});
```

### connectionStatus.isOnline()

Test if the navigator is online.

```js
module.run(function (connectionStatus, $log) {
  if (connectionStatus.isOnline())
    $log.info('We have internet!');
});
```

### connectionStatus.$on(event, listener)

Listen "online" and "offline" events to get notified when the navigator become "online" or "offline". A `$rootScope.$apply` is automatically done.

```js
module.run(function (connectionStatus) {
  connectionStatus.$on('online', function () {
    $log.info('We are now online');
  });

connectionStatus.$on('offline', function () {
    $log.info('We are now offline');
  });
});
```

## Use with angular-cache

If you want to build an application completely offline, you will need a cache that can be stored in the localStorage. To do that, the recommended method is to use [angular-cache](https://github.com/jmdobry/angular-cache).

### Specify a TTL for a GET request

You must use maxAge to specify your TTL.
If you specify deleteOnExpire to "none", the cache will be served even if your TTL is exceeded.

```js
module.run(function ($http, CacheFactory) {
  $http.get('/test.json', {
    offline: true,
    cache: CacheFactory.createCache('bookCache', {
      deleteOnExpire: 'none',
      maxAge: 60000,
      storageMode: 'localStorage'
    })
  });
});
```

### Specify a default cache for all GET requests

To get more details about this, you can read [the official documentation](https://docs.angularjs.org/api/ng/service/$http#caching).

```js
module.run(function ($http, CacheFactory) {
  $http.defaults.cache = CacheFactory.createCache('bookCache', {
      deleteOnExpire: 'none',
      maxAge: 60000,
      storageMode: 'localStorage'
    })
  });
});
```

### Use a persistent storage for POST request

You can specify the storageMode to "localStorage" to have a persistent storage for the stack.

```js
module.run(function ($http, CacheFactory) {
  offline.stackCache = CacheFactory.createCache('offlineStack', {
    storageMode: 'localStorage'
  });
});
```

## Play with example

To play with the example, you can start it using the command `npm run example`, then opening the console and try.

## Workflow

```
- Request GET
  -> interceptor.request
    -> has offline flag and is online
      -> clean cache
- Other requests
  -> interceptor.request
    -> has offline flag and is offline
      -> push request in stack
      -> reject

- "online" event
  -> process stack
```

## Browser support

This library require the [online status feature](https://developer.mozilla.org/en-US/docs/Web/API/NavigatorOnLine/onLine) activated, you can refer to [caniuse](http://caniuse.com/#feat=online-status) to see exactly what browsers are supported.

## License

MIT

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