Display events on a map using OpenStreetMap

[saivann]

Live preview: (merged)

This pull request adds a map for events based on OpenStreetMap and leaflet. No additional requirement is needed when adding new events; Google Geocoding API is used when building the website to get latitude and longitude for each event's city address.

[schildbach]

Nice!

Can we (maybe as a separate commit) be able to add exact coordinates to the events?

[saivann]

@schildbach Allowing users to optionally submit latitude & longitude in _events/* files would be quite simple. This said I'm not sure if we should display full address; users should visit events' websites so they can be informed if an event has been moved or canceled, buy tickets or subscribe if required, etc.

[schildbach]

@saivann Your argument is a point against showing a map at all. On the live preview linked above, you're showing an exact location but it's wrong.

[saivann]

@schildbach Good point, maybe it is not obvious that we're only pointing to the city. Given that we don't list opening hours, I guess that listing the full address is only good. I have just updated the pull request and live preview, does that look good to you?

[schildbach]

I verified that the geocoding for the two Berlin places works ok. Still I'd like to correct the address of c-base (the hackathon venue) to:

Rungestraße 20, 10179 Berlin

("Raumstation" is not part of the address, rather a subtitle of c-base)

[saivann]

@schildbach Fixed, thanks. I just added a seperate "venue" field for all events. I noticed that sending this information as part of the address sometime misleads the geolocating API.