[OpenLayers-Users] problem about display two layers

[Kris Geusebroek]

OpenLayers supports IE6 transparency through the alphaHack method.

layer.alpha = setAlpha('image/png');
function setAlpha(imageformat)
{
	var filter = false;
	if (imageformat.toLowerCase().indexOf("png") > -1) {
		filter = OpenLayers.Util.alphaHack(); 
	}
	return filter;
}

Cheers Kris


-----Original Message-----
From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On Behalf Of Christopher Schmidt
Sent: Friday, May 15, 2009 10:07 PM
To: Ted Scott
Cc: users at openlayers.org
Subject: Re: [OpenLayers-Users] problem about display two layers

On Fri, May 15, 2009 at 03:50:00PM -0400, Ted Scott wrote:
> I'm having the same problem with all layers having the transparent:
true 
> attribute set. The lower layers are not visible in IE 6. The map
renders 
> fine in FFx.

Yes. 32-bit PNGs (alpha transparency) are not visible in IE6. Use 8-bit
PNGs or gifs, or don't support IE6. (Microsoft doesn't.)

-- Chris

> 
> Christopher Schmidt wrote:
> > On Wed, May 13, 2009 at 01:33:22AM -0700, sasi wrote:
> >> When i display two layers with openlayers, I can only see the
second layer.
> >> After i set the second layer opacity=0.5, I can see the both
layers. But the
> >> line
> >> in the second layer seems to be transparent too. And the first
layers seems 
> >>  not be very visibility.
> >> So, can i change only the background to transparent, and keep the
line to be
> >> opacity?
> > 
> > transparent: true parameter in the WMS params.
> > 
> >> The map comes from geoserver.
> >> Thanks!
> >> -- 
> >> View this message in context:
http://n2.nabble.com/problem-about-display-two-layers-tp2879776p2879776.
html
> >> Sent from the OpenLayers Users mailing list archive at Nabble.com.
> >>
> >> _______________________________________________
> >> Users mailing list
> >> Users at openlayers.org
> >> http://openlayers.org/mailman/listinfo/users
> > 
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-- 
Christopher Schmidt
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