[OpenLayers-Users] IE strategies

bwoodall bwoodall at bwoodall.org
Wed Jan 7 12:25:28 EST 2009


On Wed, 2009-01-07 at 12:01 -0500, Yves Moisan wrote:
> > You need to limit DOM elements. WMS with a query-on-click works for
> > that. 
> 
> Right.  The whole purpose of having features is defeated though and
> that's a drag.  I'm really not fond of query-on-click to a WMS server.

Might the Hover to a WMS server work then?

> I played with the clustering strategy in a bid to limit the number of
> features to draw, but the calculations in the client are horrendously
> slow.  Typically, I get a popup asking me if I want to keep going with
> the script.  I hit yes and then I get my clusters.  For some reason
> though the rendering of clusters is faster in IE7 than FF3 ?!?
> 
> I guess an option would be to calculate the clusters on the server, e.g.
> set up some trigger in PG and calculate cluster tables for each discrete
> zoom level.  I would then point FeatureServer to a cluster table as a
> function of zoom level.  That would allow me to keep a relatively small
> number of features for the DOM to deal with.
> 
> > of course, showing 1000 features won't just be a problem for IE --
> > it will also be a problem for FF2, mobile browsers, eeepcs, etc. 
> 
> Agreed.
> 
> > 
> > Anotehr thing I do (on the OpenStreetMap homepage) is load the data,
> > then ask the user if they want to show it, if it's more than 100
> > features. That way, they hae the option of making the determination of
> > whether they think they can load it -- or the optino to zoom in further
> > if that's what they want.
> 
> Thanx for the suggestion.
> 
> Yves
> 
> 
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