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/*
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_/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/
_/ _/_/ _/ _/ _/_/ _/_/_/ _/_/_/ _/ _/
_/
_/
Created by David Kaneda <http://www.davidkaneda.com>
Documentation and issue tracking on Google Code <http://code.google.com/p/jqtouch/>
Special thanks to Jonathan Stark <http://jonathanstark.com/>
Lots of this code is specifically derived from Jonathan's book,
"Building iPhone Apps with HTML, CSS, and JavaScript"
(c) 2009 by jQTouch project members.
See LICENSE.txt for license.
*/
(function($) {
if ($.jQTouch)
{
$.jQTouch.addExtension(function Offline(){
// Convenience array of status values
var cacheStatusValues = [];
cacheStatusValues[0] = 'uncached';
cacheStatusValues[1] = 'idle';
cacheStatusValues[2] = 'checking';
cacheStatusValues[3] = 'downloading';
cacheStatusValues[4] = 'updateready';
cacheStatusValues[5] = 'obsolete';
// Listeners for all possible events
var cache = window.applicationCache;
cache.addEventListener('cached', logEvent, false);
cache.addEventListener('checking', logEvent, false);
cache.addEventListener('downloading', logEvent, false);
cache.addEventListener('error', logEvent, false);
cache.addEventListener('noupdate', logEvent, false);
cache.addEventListener('obsolete', logEvent, false);
cache.addEventListener('progress', logEvent, false);
cache.addEventListener('updateready', logEvent, false);
// Log every event to the console
function logEvent(e) {
var online, status, type, message;
online = (isOnline()) ? 'yes' : 'no';
status = cacheStatusValues[cache.status];
type = e.type;
message = 'online: ' + online;
message+= ', event: ' + type;
message+= ', status: ' + status;
if (type == 'error' && navigator.onLine) {
message+= ' There was an unknown error, check your Cache Manifest.';
}
console.log(message);
}
function isOnline() {
return navigator.onLine;
}
if (!$('html').attr('manifest')) {
console.log('No Cache Manifest listed on the <html> tag.')
}
// Swap in newly download files when update is ready
cache.addEventListener('updateready', function(e){
// Don't perform "swap" if this is the first cache
if (cacheStatusValues[cache.status] != 'idle') {
cache.swapCache();
console.log('Swapped/updated the Cache Manifest.');
}
}
, false);
// These two functions check for updates to the manifest file
function checkForUpdates(){
cache.update();
}
function autoCheckForUpdates(){
setInterval(function(){cache.update()}, 10000);
}
return {
isOnline: isOnline,
checkForUpdates: checkForUpdates,
autoCheckForUpdates: autoCheckForUpdates
}
});
}
})(jQuery);
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