[ka-Map-users] Technical alternatives for SVG on IE

Robert Thau rst at alum.mit.edu
Fri Apr 28 16:47:46 EDT 2006

Paul Spencer writes:
 > > Robert Thau wrote:
 > >
 > > I tried playing with <canvas> in Firefox.  Works fine if you're just
 > > drawing an essentially static overlay.  The only way I could think of
 > > to get mouse sensitivity, though, was to overlay a transparent image
 > > with an <imagemap>, and add <area> tags for the mouse sensitive areas.
 > > It works, but for large numbers of overlays it can be slow.  On the
 > > other hand, I'm not sure what else you *can* do to display
 > > mouse-sensitive polygonal areas in Safari...
 > >
 > If you are rendering the svg overlay on the server side anyway then a  
 > round-trip to the server via ajax would get you a tooltip quite  
 > quickly and with minimal browser impact.  Just a thought.

Ummm... not sure I understand.  AJAX requires *some* javascript to
run, in response to a mouse event, to kick off the XMLHttpRequest.
The reason for the imagemap hackery I described was to make that
happen if you were rendering graphics on a <canvas>.  If you're
using SVG, there's no point at all --- you can put mouse handlers
on the SVG objects directly.


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