Hi Everyone,
Thanks for the quick replies. Much appreciated.
To be clear, my primary question is about efficiency. Optimally, I would like
OpenLayers to check a GeoRSS XML file very regularly (e.g., every 30 seconds).
If the file has an <updated> element with a date/time since the last update,
OpenLayers would refresh the layer. However, it would seem like a
GeoRSS-friendly application would update a layer rather than destroy and reload
it. For example, if only one item was added since the previous load, OpenLayers
should only have to load that item. Reloading the entire layer each time seems
inefficient to me, and not fully in the spirit of RSS. This seems especially so
in the case of a large XML file with many points, and when the data is being
pulled from remote servers.
Does that make sense? Is the destroy/reload-style refresh the only option for
GeoRSS?
Thanks again!
Bill
Bill Hubick
william.hub...@cobham.com
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From: users-requ...@openlayers.org
Sent: Tue 8/10/2010 1:23 PM
To: users@openlayers.org
Subject: Users Digest, Vol 47, Issue 35
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Today's Topics:
1. Re: Add custom control, possible? (Planet)x)
2. Re: Add custom control, possible? (Planet)x)
3. Auto-refreshing a GeoRSS layer (Hubick, William)
4. Re: Auto-refreshing a GeoRSS layer (Bart van den Eijnden)
5. Re: Auto-refreshing a GeoRSS layer (Alexandre Dube)
6. Re: RE wmsGetFeatureInfo with Mapserver (Bennos)
7. Re: Auto-refreshing a GeoRSS layer (christopher.schm...@nokia.com)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Aug 2010 09:26:33 -0700 (PDT)
From: "Planet)x" <andrew.stew...@reddeer.ca>
Subject: Re: [OpenLayers-Users] Add custom control, possible?
To: users@openlayers.org
Message-ID: <1281457593675-5393782.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii
Sorry I figured out how to add a custom control by using the Button control
and creating a function to run when the button is clicked. My next question
is how do I change the icon image of the button if I want to have 2 or more
custom buttons? i was able to change the icon of one by using the following
code but it is the same for each button, I need different icons for each.
Thanks for advice.
.olControlPanel .olControlButtonItemActive {
background-color: blue;
background-image:
url("OpenLayers-2.9.1/theme/default/img/pan_on.png");
}
.olControlPanel .olControlButtonItemInActive {
background-color: orange;
background-image:
url("OpenLayers-2.9.1/theme/default/img/pan_off.png");
var btn = new OpenLayers.Control.Button({trigger: onTrigger});
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------------------------------
Message: 2
Date: Tue, 10 Aug 2010 09:51:15 -0700 (PDT)
From: "Planet)x" <andrew.stew...@reddeer.ca>
Subject: Re: [OpenLayers-Users] Add custom control, possible?
To: users@openlayers.org
Message-ID: <1281459075486-5393884.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii
Ok I was also able to figure this out -
for the CSS style I did this
.olControlPanel .olControlButtonHomeItemActive {
background-image:
url("OpenLayers-2.9.1/theme/default/img/home.gif");
}
.olControlPanel .olControlButtonHomeItemInActive {
background-image:
url("OpenLayers-2.9.1/theme/default/img/home.gif");
and for my button I did this -
var btn = new OpenLayers.Control.Button({trigger: onTrigger, title: "Reload
Website", displayClass: 'olControlButtonHome'});
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------------------------------
Message: 3
Date: Tue, 10 Aug 2010 13:05:27 -0400
From: "Hubick, William" <william.hub...@cobham.com>
Subject: [OpenLayers-Users] Auto-refreshing a GeoRSS layer
To: "users@openlayers.org" <users@openlayers.org>
Message-ID: <d2126a4c-774e-4229-a6b5-3fff746ae...@mimectl>
Content-Type: text/plain; charset="iso-8859-1"
Hi Everyone,
My project is considering GeoRSS as our data-sharing standard with partners. I
am pleased with how easily OpenLayers will display GeoRSS points, but I'm
wondering how other developers ensure efficient auto-updates. My first
impression was that OpenLayers would automatically check a GeoRSS XML file and
automatically load updates (i.e., like an RSS aggregator). When further
exploring, it seems like custom code must be written to auto-update the layer.
Am I missing something? Is there a way to ensure new points added to a GeoRSS
file are automatically, efficiently loaded by OpenLayers (without page
refresh)? It seems like there must be a better way to update the layer than
destroying and reloading the GeoRSS layer.
Any help would be greatly appreciated!
Thanks in advance,
Bill
Bill Hubick
Cobham Analytic Solutions
william.hub...@cobham.com
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Message: 4
Date: Tue, 10 Aug 2010 19:13:58 +0200
From: Bart van den Eijnden <bart...@osgis.nl>
Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer
To: "Hubick, William" <william.hub...@cobham.com>
Cc: "users@openlayers.org" <users@openlayers.org>
Message-ID: <f7c78f72-834b-47c3-9448-73c100d8c...@osgis.nl>
Content-Type: text/plain; charset="us-ascii"
I would use a vector layer with a http protocol pointing to the GeoRSS file,
and then add a Refresh Strategy.
Something like this (untested, for a refresh every 60 seconds):
var layer = new OpenLayers.Layer.Vector("mylayer", {
strategies: [new OpenLayers.Strategy.Fixed(), new
OpenLayers.Strategy.Refresh({interval: 60000})],
protocol: new OpenLayers.Protocol.HTTP({
url: "http://myhost/mygeorss";,
format: new OpenLayers.Format.GeoRSS()
});
Best regards,
Bart
--
Looking for flexible support on OpenLayers or GeoExt? Please check out
http://www.osgis.nl/support.html
Bart van den Eijnden
OSGIS
bart...@osgis.nl
On Aug 10, 2010, at 7:05 PM, Hubick, William wrote:
> Hi Everyone,
>
> My project is considering GeoRSS as our data-sharing standard with partners.
> I am pleased with how easily OpenLayers will display GeoRSS points, but I'm
> wondering how other developers ensure efficient auto-updates. My first
> impression was that OpenLayers would automatically check a GeoRSS XML file
> and automatically load updates (i.e., like an RSS aggregator). When further
> exploring, it seems like custom code must be written to auto-update the layer.
>
> Am I missing something? Is there a way to ensure new points added to a GeoRSS
> file are automatically, efficiently loaded by OpenLayers (without page
> refresh)? It seems like there must be a better way to update the layer than
> destroying and reloading the GeoRSS layer.
>
> Any help would be greatly appreciated!
>
> Thanks in advance,
>
> Bill
>
> Bill Hubick
> Cobham Analytic Solutions
> william.hub...@cobham.com
>
> Please consider the environment before printing this email
>
> _______________________________________________
> Users mailing list
> Users@openlayers.org
> http://openlayers.org/mailman/listinfo/users
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Message: 5
Date: Tue, 10 Aug 2010 13:14:19 -0400
From: Alexandre Dube <ad...@mapgears.com>
Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer
To: users@openlayers.org
Message-ID: <4c6188eb.7080...@mapgears.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Bill,
I never used it, but it would seem that the 'Refresh' Strategy could
do the trick for you.
Regards,
Alexandre
On 10-08-10 01:05 PM, Hubick, William wrote:
> Hi Everyone,
> My project is considering GeoRSS as our data-sharing standard with
> partners. I am pleased with how easily OpenLayers will display GeoRSS
> points, but I'm wondering how other developers ensure efficient
> auto-updates. My first impression was that OpenLayers would
> automatically check a GeoRSS XML file and automatically load updates
> (i.e., like an RSS aggregator). When further exploring, it seems like
> custom code must be written to auto-update the layer.
> Am I missing something? Is there a way to ensure new points added to a
> GeoRSS file are automatically, efficiently loaded by OpenLayers
> (without page refresh)? It seems like there must be a better way to
> update the layer than destroying and reloading the GeoRSS layer.
> Any help would be greatly appreciated!
> Thanks in advance,
> Bill
> *Bill Hubick*
> Cobham Analytic Solutions
> william.hub...@cobham.com <mailto:william.hub...@cobham.com>
> *Please consider the environment before printing this email*
>
>
> _______________________________________________
> Users mailing list
> Users@openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
--
Alexandre Dub?
Mapgears
www.mapgears.com
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------------------------------
Message: 6
Date: Tue, 10 Aug 2010 10:15:14 -0700 (PDT)
From: Bennos <benjaminprei...@gmx.at>
Subject: Re: [OpenLayers-Users] RE wmsGetFeatureInfo with Mapserver
To: users@openlayers.org
Message-ID: <1281460514970-5393989.p...@n2.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi,
Steve, thank you! The logs didnt help, but the link to the other
implementation of the GetFeatureInfo.
My mistake was, that i used an OpenLayers.Layer.MapServer instead of an
OpenLayers.Layer.WMS ... so it couldnt work. I also added the highlightLayer
from the example- i dont know exactly what its purpose is - just to be sure.
Cheers,
Benjamin
--
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------------------------------
Message: 7
Date: Tue, 10 Aug 2010 19:22:52 +0200
From: <christopher.schm...@nokia.com>
Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer
To: <william.hub...@cobham.com>
Cc: users@openlayers.org
Message-ID: <a993a915-23d8-44b0-8d72-36936749e...@nokia.com>
Content-Type: text/plain; charset="us-ascii"
On Aug 10, 2010, at 1:05 PM, ext Hubick, William wrote:
> Hi Everyone,
>
> My project is considering GeoRSS as our data-sharing standard with partners.
> I am pleased with how easily OpenLayers will display GeoRSS points, but I'm
> wondering how other developers ensure efficient auto-updates. My first
> impression was that OpenLayers would automatically check a GeoRSS XML file
> and automatically load updates (i.e., like an RSS aggregator). When further
> exploring, it seems like custom code must be written to auto-update the layer.
>
> Am I missing something? Is there a way to ensure new points added to a GeoRSS
> file are automatically, efficiently loaded by OpenLayers (without page
> refresh)? It seems like there must be a better way to update the layer than
> destroying and reloading the GeoRSS layer.
In general, RSS feeds are not updated in 'realtime' -- there
is no way that an RSS feed can 'push' data to the client consuming
it.
Using an OpenLayers.Layer.Vector, with a Protocol.HTTP, and a
Strategy.Refresh, which has:
* Property: interval
* {Number} Auto-refresh. Default is 0. If > 0, layer will be refreshed
* every N milliseconds.
*/
interval: 0,
would allow you to tell OpenLayers to re-load the GeoRSS file
from the server every $interval milliseconds.
This doesn't solve the need to have real-time updates, but it allows
you to implement a refresh without a page reload.
-- Chris
> Any help would be greatly appreciated!
>
> Thanks in advance,
>
> Bill
>
> Bill Hubick
> Cobham Analytic Solutions
> william.hub...@cobham.com
>
> Please consider the environment before printing this email
>
> <ATT00001..txt>
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