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added a bunch of code comments to clarify functionality

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This commit is contained in:
Andy Gup 2014-06-06 12:08:41 -06:00
parent 9b905ee118
commit f29fe2c547
1 changed files with 26 additions and 1 deletions
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27
samples/appcache-tiles.html
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@ -127,6 +127,11 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
Offline.check();
Offline.on('up down', updateState );
/**
* There have been a few bugs in the offline detection library (offline.min.js)
* This is a utility check to 100% validate if the application is online or
* offline prior to launching any map functionality.
*/
verifyOnline(function(result){ console.log("VERIFY ONLINE " + result)
result == true ? _isOnline = true : _isOnline = false;
startMap();
@ -155,7 +160,8 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
map.on("extent-change",function(evt){
updateOfflineUsage();
console.log("Zoom level = " + map.getLevel())
})
});
appCacheManager = new AppCacheManager(true,true);
appCacheManager.on(appCacheManager.CACHE_EVENT,cacheEventHandler);
appCacheManager.on(appCacheManager.CACHE_ERROR,cacheErrorHandler);
@ -239,6 +245,9 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
})
}
/**
* Utility function to validate min and max zoom settings of the map
*/
function getMinMaxZoom(){
var zoom = {};
@ -250,6 +259,9 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
return zoom;
}
/**
* Reports the process while downloading tiles.
*/
function reportProgress(progress)
{
console.log("downloading tiles...");
@ -279,6 +291,10 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
return _wantToCancel; //determines if a cancel request has been issued
}
/**
* Forces offlineTileEnabler to go online or offline.
* If it is offline it will try to find a tile in the local database.
*/
function goOnlineOffline(){
if(imgOfflineIndicator.offlineColor == "blue"){
btnOnlineOffline.innerHTML = "2. Go Online";
@ -294,6 +310,10 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
}
}
/**
* Manually starts the process to download and store tiles
* in the local database
*/
function downloadTiles(){
baseMapLayer.deleteAllTiles(function(success,err){
if(success == false){
@ -322,6 +342,11 @@ require(["esri/map","utils/appCacheManager","tiles/offlineTilesEnabler","dojo/on
}.bind(this))
}
/**
* Attempts an http request to verify if app is online or offline.
* Use this in conjunction with the offline checker library: offline.min.js
* @param callback
*/
function verifyOnline(callback){
var req = new XMLHttpRequest();
req.open("GET", "images/blue-pin.png?" + (Math.floor(Math.random() * 1000000000)), true);