Andrew,
I haven't had a chance to play with these cool cotrols yet but from what I
see fetching data asynchronously should not be a problem indeed.
In the fetch method you have the access to a tile so you can pass it along
with your async calls and then modify the tile imgSrc when completed.
Try something like this (not tested):
getTileData : function(tile){
this.db.transaction(
function(tx){
tx.executeSql(
'HereGoesYourSql;',
[andParams],
function (tx, results) { //success callback
if(results.rows.length == 1){
var tileCache =
results.rows.item(0);
tile.setImgSrc(tileCache.data);
}
},
function(tx, error){ //error callback
}
);
}
);
}
Hope this help
dom
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Vardeman,
Andrew [CSSM]
Sent: Tuesday, April 03, 2012 10:47 PM
To: [email protected]
Subject: [OpenLayers-Dev] RE: CacheRead and CacheWrite with Web SQL Storage?
Okay, I've started on this and have the OpenLayers.Control.CacheWrite.cache
part working (tiles are getting cached to the Web SQL DB), but I think I've
run into a problem with the OpenLayers.Control.CacheRead.fetch method. I'm
not quite sure what's happening, but it appears that the fetch method needs
to complete synchronously for the dataURL it supplies to be used as the
image src. Does that sound right? If so, I think I'm dead in the water.
Andrew
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Vardeman,
Andrew [CSSM]
Sent: Monday, April 02, 2012 1:44 PM
To: [email protected]
Subject: [OpenLayers-Dev] CacheRead and CacheWrite with Web SQL Storage?
Hi, OpenLayers developers. This is my first email; I hope I'm posting this
to the proper list.
I'm interested in the work done here:
https://github.com/openlayers/openlayers/pull/301
The pull request says that "even asynchronous backends could be added." By
any chance, is anyone working on Web SQL Storage version or the mentioned
pluggable version with multiple backends? I need such a thing for my
current project, so I'll probably try if no one else is already doing it.
If I get something working that's sufficiently generic, I'll submit it as a
patch.
Thanks,
Andrew Vardeman
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