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var APP_PREFIX = 'hoverbitcontroller' // Identifier for this app (this needs to be consistent across every cache update)
var VERSION = 'version_01' // Version of the off-line cache (change this value everytime you want to update cache)
var CACHE_NAME = APP_PREFIX + VERSION
var URLS = [ // Add URL you want to cache in this list.
'/hoverbit-ble/', // If you have separate JS/CSS files,
'/hoverbit-ble/index.html', // add path to those files here
'/hoverbit-ble/styles.css',
'/hoverbit-ble/microbit.umd.js',
'/hoverbit-ble/script.js'
]
// Respond with cached resources
self.addEventListener('fetch', function (e) {
console.log('fetch request : ' + e.request.url)
e.respondWith(
caches.match(e.request).then(function (request) {
if (request) { // if cache is available, respond with cache
console.log('responding with cache : ' + e.request.url)
return request
} else { // if there are no cache, try fetching request
console.log('file is not cached, fetching : ' + e.request.url)
return fetch(e.request)
}
// You can omit if/else for console.log & put one line below like this too.
// return request || fetch(e.request)
})
)
})
// Cache resources
self.addEventListener('install', function (e) {
e.waitUntil(
caches.open(CACHE_NAME).then(function (cache) {
console.log('installing cache : ' + CACHE_NAME)
return cache.addAll(URLS)
})
)
})
// Delete outdated caches
self.addEventListener('activate', function (e) {
e.waitUntil(
caches.keys().then(function (keyList) {
// `keyList` contains all cache names under your username.github.io
// filter out ones that has this app prefix to create white list
var cacheWhitelist = keyList.filter(function (key) {
return key.indexOf(APP_PREFIX)
})
// add current cache name to white list
cacheWhitelist.push(CACHE_NAME)
return Promise.all(keyList.map(function (key, i) {
if (cacheWhitelist.indexOf(key) === -1) {
console.log('deleting cache : ' + keyList[i] )
return caches.delete(keyList[i])
}
}))
})
)
})
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