How to make offline maps(using leaflet OSM) , by caching?

Question

I am trying to make offline maps through caching (IndexedDB) in browser. I understand the concept is that I download and store the tiles of map first when connected to internet.

Then I have to load the tiles logically offline.

However, I'm not able to figure it out.

How do I store them and how to load them again logically? I'm stuck here. I am using the leaflet API for maps. How can this be implemented?

Answer 1

See my extensive research on this at:

Storing Image Data for offline web application (client-side storage database)

and at:

https://gis.stackexchange.com/questions/44813/database-for-offline-slippy-map-tiles

Key for what you want to do is a Functional Tile layer to get stuff from the DB:

https://github.com/ismyrnow/Leaflet.functionaltilelayer

BTW, I am just now testing out PouchDB for this, which is much cleaner that the raw IndexeDB.

Follow my results at:

https://groups.google.com/forum/?fromgroups#!topic/pouchdb/RG6wUsAi2R0

Answer 2

I have cache example implementation http://tbicr.github.com/OfflineMap/leaflet/index.html and code https://github.com/tbicr/OfflineMap/tree/master/leaflet_idb_sql_site.

For storage used IndexedDB and WebSQL. Storage had low performance and not tested.