Merge pull request #58 from sz3/service-worker

Add service worker script for cimbar.org

web/index.html

@@ -290,6 +290,9 @@
 <a id="invisible_click" href="javascript:;" onclick="Main.clickNav()"></a>
 
 <script type="text/javascript">
+	if ('serviceWorker' in navigator) {
+		navigator.serviceWorker.register('./sw.js');
+	}
 	var canvas = document.getElementById('canvas');
 
 	var Module = {};

web/sw.js

@@ -0,0 +1,40 @@
+
+var _cacheName = 'cimbar-js-v0.5.8.c';
+var _cacheFiles = [
+  '/',
+  '/index.html',
+  '/cimbar_js.js',
+  '/cimbar_js.wasm',
+  '/favicon.ico',
+  '/main.js'
+];
+
+// fetch files
+self.addEventListener('install', function(e) {
+  e.waitUntil(
+    caches.open(_cacheName).then(function(cache) {
+      return cache.addAll(_cacheFiles);
+    })
+  );
+  self.skipWaiting();
+});
+
+// serve from cache
+self.addEventListener('fetch', function(e) {
+  e.respondWith(
+    caches.match(e.request).then(function(response) {
+      return response || fetch(e.request);
+    })
+  );
+});
+
+// clean old caches
+self.addEventListener('activate', function(e) {
+  e.waitUntil(function() {
+    caches.keys().then(function(names) {
+      for (var i in names)
+         if (names[i] != _cacheName)
+            caches.delete(names[i]);
+    });
+  });
+});