es5-ff-spa-loader
=========

A javascript library providing server defined loading of assets for a single page application.

## Installation

  npm --save install es5-ff-spa-loader

  Then use the dist/es5-ff-spa-loader.min.js script inline in the index.

## Features

 * Assets caching for offline use.
 * Assets hashing for fast syncing.
 * Assets types: js,css,cssData
 * Caching backends: localStorage,webSqlDB,sqllite,none
 * Server url question ui.
 * Loader error ui. 
 * Build-in Cordova booting.
 * Build-in AngularJS booting.

## Usage

### Usage Multi Server (Minimal)

	FFSpaLoader.options.server.assets = '/api/path/to/spa/client/resources';
	FFSpaLoader.start();

### Usage Single Server

	FFSpaLoader.options.server.url = 'http://myserver';
	FFSpaLoader.options.server.assets = '/api/path/to/spa/client/resources';
	FFSpaLoader.start();

### Usage Angular

	FFSpaLoader.options.debug.enable = true;
	FFSpaLoader.options.boot.angular.modules.push('exampleUI');
	FFSpaLoader.options.server.url = 'http://myserver';
	FFSpaLoader.options.server.assets = '/api/path/to/spa/client/resources';
	FFSpaLoader.start(function() {
		console.log('FFExample.boot done');
	}); 

## Assets format

	{
		"data": {
			"resources": [
			{
				"url": "/static/js/some-asset.js",
				"type": "js",
				"hash": ​-164319899
			},
			{
				"url": "/static/css/some-asset.css",
				"type": "css",
				"hash": ​1391550981
			},
			{
				"url": "/static/css/more-asset-data.css",
				"type": "cssData",
				"hash": ​1371811412
			},
        ]
    }

  The hash key is required as only on hash change the resource will be downloaded again, so multiple small files makes updates faster.


## Options

  The available FFSpaLoader.options.* values;

 * debug.enable = Enable debug output. (default: false)
 * debug.handler = Prints/log debug message. (default: console.log)
 * debug.prefix = Debug message prefix. (default: 'FFSpaLoader.')
 * error.handler = The error handler. (default: internal error handler ui)
 * error.title = The error title. (default: 'Loader ');
 * error.style = The error ui css style. (default: red error)
 * boot.cordova.enable = Use deviceready event to boot when cordova is detected. (default: true)
 * boot.cordova.timeout = Boot after (if<0=no-)timeout when deviceready event is not received. (default: -1)
 * boot.cordova.flag = The window flag which is set when cordova is booted. (default: 'FFCordovaDevice')
 * boot.angular.enable = Auto bootstrap angular modules. (default: true)
 * boot.angular.modules = The angular modules to boot. (default: empty)
 * server.url = The server url like 'https://myhost', when null the user will get promted to input it. (default: null)
 * server.assets = The server path to the assets resources definition file, is required (default: null)
 * server.timeout = The timeout to download the server resources. (default: 4096)
 * server.flag = The window flag which is set when the server.url is know. (default: 'FFServerUrl')
 * server.header.request = An key value object with the request headers. (default: {'X-FFSpaLoader': 'sync'})
 * question.transport = The transport to prefix the server.url with. (default: 'http://')
 * question.title = The question ui title. (default: 'Server')
 * question.submit = The start button text. (default: 'Start')
 * question.text = The question ui text. (default: 'Please provide the server name;')
 * question.size = The question ui input size. (default: 32)
 * question.style = The question ui css style. (default: blue input)
 * question.validate.min.value = The minimal hostname length, false is disabled (default: 3)
 * question.validate.min.message = The error message (default: 'Server name is to short.')
 * question.validate.max.value = The maximal hostname length, false is disabled (default: 255)
 * question.validate.max.message =The error message (default: 'Server name is to long.')
 * question.validate.regex.value = The regex to validate the hostname, false is disabled. (default: '^([a-zA-Z0-9\.\:])*$')
 * question.validate.regex.message = The error message (default: 'Server name is invalid.')
 * cache.meta = The cache backend for the meta information(server.url+content), null is auto select,false is disable. (default: null)
 * cache.js = The cache backend for for js, null is auto select,false is disable. (default: null)
 * cache.css = The cache backend for for css, null is auto select,false is disable. (default: null)
 * cache.cssData = The cache backend for for cssData, null is auto select,false is disable. (default: null)


## Factory

  The available FFSpaLoader.factory.* functions;

 * detect.localStorage() = Checks is localStorage is working.
 * detect.openDatabase() = Checks if openDatabase is defined.
 * detect.sqlitePlugin() = Checks if sqlitePlugin is defined.
 * detect.cordova() = Checks if cordova is defined.
 * detect.cordovaDevice() = Checks if the options.boot.cordova.flag is defined in the window.(NOTE: is always false before calling start();)  
 * cache.localStorage() = Creates an localStorage service.
 * cache.websql(opt) = Creates an websql service.

## Cache Types

  The cache types in FFSpaLoader.options.cache.* store different types data;

 * meta = Stores server.url and server.assets data.
 * js = Store application javascript data.
 * css = Stores application css data.
 * cssData = Stores application css large data like base64 fonts/svg/etc.

## Cache Config

  Per default all cache types are auto selected in the following order;
  
 * detect.sqlitePlugin() and detect.cordovaDevice()
 * detect.openDatabase()
 * detect.localStorage()
 * none
  
  More custom schemas are possible like; (todo: needs testing)
  
	FFSpaLoader.options.cache.meta = false;
	FFSpaLoader.options.cache.js = false;
	FFSpaLoader.options.cache.css = false;
	FFSpaLoader.options.cache.cssData = false; 
	
	if (FFSpaLoader.factory.detect.localStorage()) {
		FFSpaLoader.options.cache.css = FFSpaLoader.factory.cache.localStorage();
		FFSpaLoader.options.cache.cssData = FFSpaLoader.factory.cache.localStorage();
	}
	FFSpaLoader.options.server.url = 'http://myserver';
	FFSpaLoader.options.server.assets = '/api/path/to/spa/client/resources';
	FFSpaLoader.start();
  

## Example Application

  There is a fully working nodejs example application in the example folder.

## Tested Browsers

 * Chromium	46
 * Iceweasel 43
 * Opera 12 Presto
 * IE 11 Edge
 * Android 5.1.1 in Cordova + Site
 * Android 4.4.4 in Cordova + Site
 * Android 4.2.2 in Cordova + Site

## Todo

 * test in production
 * Add Loader progress bar
 * Server header check support
 * Add table+instance websql options so it can also be used in application code.
 * Split assets per type so do js first then boot then css + cssData.
 * Move css to file ?
 * Add more tests
 * css: set tag.media = 'only you';
 * css: add media in resouces
 * Add in browser tests
 * example: rm from dist and add cordova and use gulp 
  
## Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style.
Add unit tests for any new or changed functionality. Lint and test your code.

## Release History 

### 0.1.1
* Moved websql delete timeout to cleanServerlUrl for faster boot.
* Fixed websql db-size and db-name for older androids.
* Added more jsdoc.
* Added question.size option.
* Changed websql option openDatabase to returning open function.
* Fixed sqlitePlugin open function was typo on openDatabase.
* Added websql table option. (defaults to 'cache_store')
 
### 0.1.0
* Moved options.server.question to options.question.
* Added question.validate.[min|max|regex].value|message options.
* Strip question value to hostname+port before use and validating.
* Allow user upgrade to https in question input from default of transport option.
* Added server request headers option.
* Updated css of question and error ui.
* Fixed cordova booting.

### 0.0.4
* Added auto cache clean code.
* Disable cordova timeout per default.
* Remove unused mobileAgent detect.
* Fixed cached resources injection order.

### 0.0.3
* Fixed example script path.
* Fixed example size.
* Initial release.