[OpenLayers-Users] Permalink doesn't update on addlayer/removelayer

[Slawomir Messner]

  Hi all,
I thought permalink should have the information about visibility(and 
other stuff) and should refresh when this values change, then for me 
it's a bug when the initial values are not stored in the link (it's like 
the first change).
The other thing is the need for extra information about layers to load 
them at the beginning. Thanks for the link Andreas, I will visit it 
tomorrow. I didn't look for an external solution because Permalink and 
ArgParams are easy to extend and the informations are not complex. But 
who knows, maybe there will be more data to store, so I will visit your 
link, thx.
Regards,
Slawomir

Am 24.08.2010 15:15, schrieb Marc Jansen:
> Hi Andreas,
>
> first of all, sorry for cross-posting in the past. I thought it was
> useful in this case.
>
> I'd disagree about the not handling of the layeradd/layerremove event
> for the Permalink-control -- but can easily live without this addition
> to OpenLayers :-)
>
> Your suggestions of alternative ways of handling application "state" are
> valid and often better suited, yet I think the addition of two
> additional listeners to the control would be very intuitive.
>
> Best regards,
>
> Marc
>
>
>
> On 24.08.2010 14:49, Andreas Hocevar wrote:
>> Hi,
>>
>> first of all, please don't cross-post dev and users.
>>
>> I am not sure if a permalink as provided by OpenLayers is what you really want for applications where the user can add or remove layers. The permalink only stores the visible/invisible state of the available layers in their order. It does not know anything about what these layers are. So a permalink will look exactly the same for any map with the same extent with let's say 3 layers that are all visible.
>>
>> If you want to store information on what layers are actually configured, you should look into Format.WMC, Format.OWS or solutions like the OpenGeo Suite's GeoExplorer (http://suite.opengeo.org/geoexplorer), which stores layer configurations in a database and provides a permalink with a map id.
>>
>> Regards,
>> Andreas.
>>
>> On Aug 24, 2010, at 14:31 , Marc Jansen wrote:
>>
>>
>>> Hi Slawomir,
>>>
>>> I'd consider this a bug with a (on first sight) reasonable easy fix:
>>>
>>> In the Permalinks draw-method:
>>>
>>>           this.map.events.on({
>>>               'moveend': this.updateLink,
>>>               'changelayer': this.updateLink,
>>>               'changebaselayer': this.updateLink,
>>>               'addlayer': this.updateLink,
>>>               'removelayer': this.updateLink,
>>>               scope: this
>>>           });
>>>
>>> Or one could think of triggering a changelayer event when a layer has
>>> been added/removed in Map.js.
>>>
>>> I am unsure which design is better, so I'd suggest opening up a ticket
>>> (I cc'ed the developer list so the core developers notice this discussion).
>>>
>>> Regards,
>>> Marc
>>>
>>>
>>>
>>>
>>> On 24.08.2010 13:53, Slawomir Messner wrote:
>>>
>>>>     Hello,
>>>> Does anyone know why Permalink doesn't listen to addlayer/removelayer?
>>>> Every time I add a new layer I have to change a property(i.e.
>>>> visibility) to refresh the link. It's a bug or a feature?
>>>> Regards,
>>>> Slawomir
>>>>
>>>>
>>> _______________________________________________
>>> Dev mailing list
>>> Dev at openlayers.org
>>> http://openlayers.org/mailman/listinfo/dev
>>>
>>
>


-- 
-----------------------------------------------
Slawomir Messner
Forschungszentrum "Deutscher Sprachatlas"
06421-28-24981