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 [email protected] Please consider the environment before printing this email From: [email protected] Sent: Tue 8/10/2010 1:23 PM To: [email protected] Subject: Users Digest, Vol 47, Issue 35 Send Users mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://openlayers.org/mailman/listinfo/users or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Users digest..." 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 ([email protected]) ---------------------------------------------------------------------- Message: 1 Date: Tue, 10 Aug 2010 09:26:33 -0700 (PDT) From: "Planet)x" <[email protected]> Subject: Re: [OpenLayers-Users] Add custom control, possible? To: [email protected] Message-ID: <[email protected]> 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}); -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Add-custom-control-possible-tp5393642p5393782.html Sent from the OpenLayers Users mailing list archive at Nabble.com. ------------------------------ Message: 2 Date: Tue, 10 Aug 2010 09:51:15 -0700 (PDT) From: "Planet)x" <[email protected]> Subject: Re: [OpenLayers-Users] Add custom control, possible? To: [email protected] Message-ID: <[email protected]> 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'}); -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/Add-custom-control-possible-tp5393642p5393884.html Sent from the OpenLayers Users mailing list archive at Nabble.com. ------------------------------ Message: 3 Date: Tue, 10 Aug 2010 13:05:27 -0400 From: "Hubick, William" <[email protected]> Subject: [OpenLayers-Users] Auto-refreshing a GeoRSS layer To: "[email protected]" <[email protected]> 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 [email protected] Please consider the environment before printing this email -------------- next part -------------- An HTML attachment was scrubbed... URL: http://openlayers.org/pipermail/users/attachments/20100810/976b17ce/attachment-0001.htm ------------------------------ Message: 4 Date: Tue, 10 Aug 2010 19:13:58 +0200 From: Bart van den Eijnden <[email protected]> Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer To: "Hubick, William" <[email protected]> Cc: "[email protected]" <[email protected]> Message-ID: <[email protected]> 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 [email protected] 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 > [email protected] > > Please consider the environment before printing this email > > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users -------------- next part -------------- An HTML attachment was scrubbed... URL: http://openlayers.org/pipermail/users/attachments/20100810/1d52c928/attachment-0001.htm ------------------------------ Message: 5 Date: Tue, 10 Aug 2010 13:14:19 -0400 From: Alexandre Dube <[email protected]> Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer To: [email protected] Message-ID: <[email protected]> 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 > [email protected] <mailto:[email protected]> > *Please consider the environment before printing this email* > > > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users > -- Alexandre Dub? Mapgears www.mapgears.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://openlayers.org/pipermail/users/attachments/20100810/9b1a3673/attachment-0001.htm ------------------------------ Message: 6 Date: Tue, 10 Aug 2010 10:15:14 -0700 (PDT) From: Bennos <[email protected]> Subject: Re: [OpenLayers-Users] RE wmsGetFeatureInfo with Mapserver To: [email protected] Message-ID: <[email protected]> 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 -- View this message in context: http://osgeo-org.1803224.n2.nabble.com/wmsGetFeatureInfo-with-Mapserver-tp5392643p5393989.html Sent from the OpenLayers Users mailing list archive at Nabble.com. ------------------------------ Message: 7 Date: Tue, 10 Aug 2010 19:22:52 +0200 From: <[email protected]> Subject: Re: [OpenLayers-Users] Auto-refreshing a GeoRSS layer To: <[email protected]> Cc: [email protected] Message-ID: <[email protected]> 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 > [email protected] > > Please consider the environment before printing this email > > <ATT00001..txt> ------------------------------ _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users End of Users Digest, Vol 47, Issue 35 *************************************
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