[OSM-dev] Clickable POIs - use marker/pushpin layer?

[Christopher Schmidt]

On Tue, Jan 08, 2008 at 11:53:35AM +0000, Richard Fairhurst wrote:
> John McKerrell wrote:
> 
> > An advantage of using markers is the ability to give instant
> > feedback, changing the mouse cursor to indicate that this is
> > something you can actually interact with. It's possibly to do this
> > without markers too but they are the simplest way.
> 
> It's hacky, but the Sustrans map has exactly the right approach on  
> this - an invisible imagemap with a bit of JavaScript behind it.
> 
> _But_ I suspect this would boggle our servers too much (it certainly  
> does theirs ;) ) , so it would almost certainly have to be cached per  
> tile and then aggregated within OL, and good luck coding that.  
> (Seriously, good luck. I'd love to see it.)

It's certainly within the design of OpenLayers -- in OL Mark III (we're
on IV now, little piece of OL trivia for you) we didn't actually have
any markers, *just* imagemaps and corresponding WMS.

If you're going to go that route, *please please please* communicate
with the OL Dev list. Implementing it without feedback from OL
developers is going to cause everyone involved pain. If you send email
to the dev list, I promise I will respond -- prboably not within 24
hours, but I'll do as best as I can.

Regards,
-- 
Christopher Schmidt
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