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.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 in Cordova

Todo

• test in production
• 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

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.
• Added more jsdoc

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.