| 1 | /* |
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| 2 | |
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| 3 | _/ _/_/ _/_/_/_/_/ _/ |
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| 4 | _/ _/ _/ _/_/ _/ _/ _/_/_/ _/_/_/ |
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| 5 | _/ _/ _/_/ _/ _/ _/ _/ _/ _/ _/ _/ |
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| 6 | _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ |
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| 7 | _/ _/_/ _/ _/ _/_/ _/_/_/ _/_/_/ _/ _/ |
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| 8 | _/ |
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| 9 | _/ |
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| 10 | |
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| 11 | Created by David Kaneda <http://www.davidkaneda.com> |
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| 12 | Documentation and issue tracking on Google Code <http://code.google.com/p/jqtouch/> |
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| 13 | |
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| 14 | Special thanks to Jonathan Stark <http://jonathanstark.com/> |
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| 15 | |
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| 16 | Lots of this code is specifically derived from Jonathan's book, |
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| 17 | "Building iPhone Apps with HTML, CSS, and JavaScript" |
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| 18 | |
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| 19 | (c) 2009 by jQTouch project members. |
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| 20 | See LICENSE.txt for license. |
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| 21 | |
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| 22 | */ |
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| 23 | |
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| 24 | (function($) { |
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| 25 | if ($.jQTouch) |
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| 26 | { |
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| 27 | $.jQTouch.addExtension(function Offline(){ |
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| 28 | |
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| 29 | // Convenience array of status values |
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| 30 | var cacheStatusValues = []; |
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| 31 | cacheStatusValues[0] = 'uncached'; |
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| 32 | cacheStatusValues[1] = 'idle'; |
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| 33 | cacheStatusValues[2] = 'checking'; |
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| 34 | cacheStatusValues[3] = 'downloading'; |
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| 35 | cacheStatusValues[4] = 'updateready'; |
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| 36 | cacheStatusValues[5] = 'obsolete'; |
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| 37 | |
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| 38 | // Listeners for all possible events |
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| 39 | var cache = window.applicationCache; |
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| 40 | cache.addEventListener('cached', logEvent, false); |
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| 41 | cache.addEventListener('checking', logEvent, false); |
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| 42 | cache.addEventListener('downloading', logEvent, false); |
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| 43 | cache.addEventListener('error', logEvent, false); |
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| 44 | cache.addEventListener('noupdate', logEvent, false); |
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| 45 | cache.addEventListener('obsolete', logEvent, false); |
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| 46 | cache.addEventListener('progress', logEvent, false); |
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| 47 | cache.addEventListener('updateready', logEvent, false); |
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| 48 | |
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| 49 | // Log every event to the console |
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| 50 | function logEvent(e) { |
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| 51 | var online, status, type, message; |
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| 52 | online = (isOnline()) ? 'yes' : 'no'; |
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| 53 | status = cacheStatusValues[cache.status]; |
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| 54 | type = e.type; |
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| 55 | message = 'online: ' + online; |
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| 56 | message+= ', event: ' + type; |
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| 57 | message+= ', status: ' + status; |
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| 58 | if (type == 'error' && navigator.onLine) { |
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| 59 | message+= ' There was an unknown error, check your Cache Manifest.'; |
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| 60 | } |
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| 61 | console.log(message); |
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| 62 | } |
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| 63 | |
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| 64 | function isOnline() { |
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| 65 | return navigator.onLine; |
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| 66 | } |
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| 67 | |
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| 68 | if (!$('html').attr('manifest')) { |
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| 69 | console.log('No Cache Manifest listed on the <html> tag.') |
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| 70 | } |
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| 71 | |
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| 72 | // Swap in newly download files when update is ready |
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| 73 | cache.addEventListener('updateready', function(e){ |
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| 74 | // Don't perform "swap" if this is the first cache |
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| 75 | if (cacheStatusValues[cache.status] != 'idle') { |
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| 76 | cache.swapCache(); |
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| 77 | console.log('Swapped/updated the Cache Manifest.'); |
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| 78 | } |
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| 79 | } |
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| 80 | , false); |
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| 81 | |
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| 82 | // These two functions check for updates to the manifest file |
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| 83 | function checkForUpdates(){ |
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| 84 | cache.update(); |
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| 85 | } |
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| 86 | function autoCheckForUpdates(){ |
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| 87 | setInterval(function(){cache.update()}, 10000); |
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| 88 | } |
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| 89 | |
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| 90 | return { |
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| 91 | isOnline: isOnline, |
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| 92 | checkForUpdates: checkForUpdates, |
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| 93 | autoCheckForUpdates: autoCheckForUpdates |
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| 94 | } |
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| 95 | }); |
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| 96 | } |
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| 97 | })(jQuery); |
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