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Playing with implementing AppCache through the NavigationController
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| var fallbacks = {} | |
| , networks = {} | |
| , cacheName = "OldSchoolAppCache" | |
| ; | |
| this.onmessage = function (e) { | |
| var msg = e.data; | |
| if (msg.type && msg.type === "manifest") { | |
| var lines = msg.manifest.split(/\n+/) | |
| , mode = "cache" | |
| , hadCache = false | |
| , cache | |
| ; | |
| if (cache = this.caches.get(cacheName)) { | |
| hadCache = true; | |
| } | |
| else { | |
| cache = new Cache(); | |
| } | |
| // this is not the real parsing algorithm | |
| if (lines.shift() !== "CACHE MANIFEST") return; | |
| while (lines.length) { | |
| var line = lines.shift(); | |
| if (line.match(/(?:^\s*$)|(?:^\s*#.*$)/)) continue; | |
| var directive = line.match(/^(CACHE|NETWORK|FALLBACK):$/); | |
| if (directive) { | |
| mode = directive.toLowerCase(); | |
| continue; | |
| } | |
| line = line.replace(/(^\s+|\s+$)/g, ""); | |
| if (mode === "cache") { | |
| cache.add(line); | |
| } | |
| else if (mode === "fallback") { | |
| var parts = line.split(/\s+/, 2); | |
| fallbacks[parts[0]] = parts[1]; | |
| } | |
| else { | |
| networks[line] = true; | |
| } | |
| } | |
| if (!hadCache) this.caches.set(cacheName, cache); | |
| } | |
| }; | |
| // we don't handle wildcards, but that's a detail | |
| this.onrequest = function (e) { | |
| var cache = this.caches.get(cacheName); | |
| if (networks[e.request.url]) return; // hit the network | |
| if (fallbacks[e.request.url] && !this.onLine) { | |
| var res = cache.match(fallbacks[e.request.url]); | |
| if (res) { | |
| e.preventDefault(); | |
| e.respondWith(res); | |
| return; | |
| } | |
| } | |
| }; |
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| <!DOCTYPE html> | |
| <html manifest="foo.manifest" controller="controller.js" controllerpath="/*"> | |
| <head> | |
| <script> | |
| if (document.documentElement.hasAttribute("manifest")) { | |
| window.controller.ready().then(function () { | |
| var xhr = new XMLHttpRequest(); | |
| xhr.open("GET", document.documentElement.getAttribute("manifest")); | |
| xhr.onreadystatechange = function () { | |
| if (xhr.readyState === 4 && xhr.status === 200) { | |
| window.controller.postMessage({ type: "manifest", manifest: xhr.responseText}); | |
| } | |
| }; | |
| xhr.send(); | |
| }); | |
| } | |
| </script> | |
| </head> | |
| </html> |
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