[Geoserver-devel] Exposing OL2 and OL3 previews at the same time

GeoServer GeoServer Developer
1

Hi,
I would like to propose we bring back the OL2 preview as an alternative output format “application/openlayers2”.

The reason is quite simple, I’m tired of pulling hairs with the current canvas based preview.
I just spend some days debugging issues that were happening mostly when doing requests in tiled mode,
and hunting down the right request in the network logs has been quite a drag of time.

Yes, there is a system variable to bring back the OL2 preview, but it’s not the default, cannot be easily
activated on a production system.

Also, at least from a didactic perspective, it’s nice to pull up OL2 and tell the students to just right click on the
map/the tiles and see that it’s really just a WMS call, rather than pulling up the dev tools and also explain
them the network view in the process.

Of course I’m not proposing to simply go back to OL2, but in some ways the OL3 preview is not
a full replacement for the old OL2, so imho best to have them both available at the same time
by just changing a request parameter, keeping OL2 as a possible option while OL3+ remains
the default for previews.

Objections? :slight_smile:

Cheers
Andrea

PS: another very annoying thing is that the OL3 preview just shows nothing when
a request fails, instead of a “broken image” like in OL2, but I guess for this there are solutions,
like using “error in image” for exceptions or something like that, sounds more like a bug in need
of fixing instead of an architectural problem.

···

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

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2

Yes, please - I was struggling with this the other day.

Ian

···

On 5 October 2017 at 14:31, Andrea Aime <andrea.aime@anonymised.com> wrote:

Hi,
I would like to propose we bring back the OL2 preview as an alternative output format “application/openlayers2”.

The reason is quite simple, I’m tired of pulling hairs with the current canvas based preview.
I just spend some days debugging issues that were happening mostly when doing requests in tiled mode,
and hunting down the right request in the network logs has been quite a drag of time.

Yes, there is a system variable to bring back the OL2 preview, but it’s not the default, cannot be easily
activated on a production system.

Also, at least from a didactic perspective, it’s nice to pull up OL2 and tell the students to just right click on the
map/the tiles and see that it’s really just a WMS call, rather than pulling up the dev tools and also explain
them the network view in the process.

Of course I’m not proposing to simply go back to OL2, but in some ways the OL3 preview is not
a full replacement for the old OL2, so imho best to have them both available at the same time
by just changing a request parameter, keeping OL2 as a possible option while OL3+ remains
the default for previews.

Objections? :slight_smile:

Cheers
Andrea

PS: another very annoying thing is that the OL3 preview just shows nothing when
a request fails, instead of a “broken image” like in OL2, but I guess for this there are solutions,
like using “error in image” for exceptions or something like that, sounds more like a bug in need
of fixing instead of an architectural problem.

==

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

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–

Ian Turton

3

I wonder how practical it would be to replicate this functionality in OL3? Maybe something that could plug into a tile layer to generate a vector overlay where each request is represented as a feature. More work than just using OL2 but it might be worth suggesting to the OL developers.

···

On 2017-10-05 06:36 AM, Ian Turton wrote:

Yes, please - I was struggling with this the other day.

Ian

On 5 October 2017 at 14:31, Andrea Aime <andrea.aime@anonymised.com> wrote:

Hi,
I would like to propose we bring back the OL2 preview as an alternative output format “application/openlayers2”.

The reason is quite simple, I’m tired of pulling hairs with the current canvas based preview.
I just spend some days debugging issues that were happening mostly when doing requests in tiled mode,
and hunting down the right request in the network logs has been quite a drag of time.

Yes, there is a system variable to bring back the OL2 preview, but it’s not the default, cannot be easily
activated on a production system.

Also, at least from a didactic perspective, it’s nice to pull up OL2 and tell the students to just right click on the
map/the tiles and see that it’s really just a WMS call, rather than pulling up the dev tools and also explain
them the network view in the process.

Of course I’m not proposing to simply go back to OL2, but in some ways the OL3 preview is not
a full replacement for the old OL2, so imho best to have them both available at the same time
by just changing a request parameter, keeping OL2 as a possible option while OL3+ remains
the default for previews.

Objections? :slight_smile:

Cheers
Andrea

PS: another very annoying thing is that the OL3 preview just shows nothing when
a request fails, instead of a “broken image” like in OL2, but I guess for this there are solutions,
like using “error in image” for exceptions or something like that, sounds more like a bug in need
of fixing instead of an architectural problem.

==

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il loro utilizzo è consentito esclusivamente al destinatario del messaggio, per le finalità indicate nel messaggio stesso. Qualora riceviate questo messaggio senza esserne il destinatario, Vi preghiamo cortesemente di darcene notizia via e-mail e di procedere alla distruzione del messaggio stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso, divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od utilizzarlo per finalità diverse, costituisce comportamento contrario ai principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for the attention and use of the named addressee(s) and may be confidential or proprietary in nature or covered by the provisions of privacy act (Legislative Decree June, 30 2003, no.196 - Italy’s New Data Protection Code).Any use not in accord with its purpose, any disclosure, reproduction, copying, distribution, or either dissemination, either whole or partial, is strictly forbidden except previous formal approval of the named addressee(s). If you are not the intended recipient, please contact immediately the sender by telephone, fax or e-mail and delete the information in this message that has been received in error. The sender does not give any warranty or accept liability as the content, accuracy or completeness of sent messages and accepts no responsibility for changes made after they were sent or for other risks which arise as a result of e-mail transmission, viruses, etc.

Check out the vibrant tech community on one of the world’s most
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–

Ian Turton

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-- 
Kevin Michael Smith
[<smithkm@anonymised.com>](mailto:smithkm@anonymised.com)
4

On Fri, Oct 6, 2017 at 12:54 AM, Kevin Smith <smithkm@anonymised.com> wrote:

I wonder how practical it would be to replicate this functionality in
OL3? Maybe something that could plug into a tile layer to generate a
vector overlay where each request is represented as a feature. More work
than just using OL2 but it might be worth suggesting to the OL developers.

That sounds quite complicated, not sure OL devs are going to be interested,
but if you want to try, go ahead.
Gut feeling, they will tell you to implement it custom in the GeoServer OL
preview.

In the meantime I've proposed a 30 minutes change:
https://github.com/geoserver/geoserver/pull/2575

Cheers
Andrea

==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.

Ing. Andrea Aime
@geowolf
Technical Lead

GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

AVVERTENZE AI SENSI DEL D.Lgs. 196/2003

Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.

The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.