[OpenLayers-Dev] API function and event for changing WMS LAYERS param?

[Bart van den Eijnden (OSGIS)]

Hey Tim,

agreed, final question now is at which level of the hierarchy do we 
implement this? Layer.WMS or Layer.HTTPRequest?

I've opened up a ticket:

http://trac.openlayers.org/ticket/2179

Best regards,
Bart

Tim Schaub wrote:
> Hey-
>
> Eric Lemoine wrote:
>   
>> On Tuesday, July 14, 2009,  <bartvde at osgis.nl> wrote:
>>     
>>> Hi list,
>>>
>>> this came up on the geoext list [1], and Eric and I are interested how
>>> other OL devs feel about this.
>>>
>>> Currently, when the LAYERS param is changed for an OpenLayers.Layer.WMS
>>> layer, there is no way for an external component (like the GeoExt legend
>>> panel), te know that something has changed and that they need to update
>>> themselves.
>>>
>>> So what I was proposing is an API function updateLayersParam or something
>>> similar, which will do the updating, and trigger a changelayer event with
>>> property e.g. layersparam.
>>>
>>> Thoughts/comments more than welcome, also if people see other possible
>>> solutions. Also on the naming ofcourse.
>>>
>>> If there is support for this, then I'll gladly create a ticket and a patch
>>> with tests.
>>>       
>> Hi Bart
>>
>> updateLayersParam may be too specific. And actually we already have
>> mergeNewParams for updating params so we could just make
>> mergeNewParams trigger "changelayer" with "property" set to
>> "mergenewparams" or something. With something like that, if one is
>> interested in updates for the "layers" param only, one will have to
>> manually check that the "layers" param has changed. That sounds
>> reasonable to me.
>>
>>     
>
> I agree.  No need for a new method, just notification (and I think 
> "params" makes a fine value for the "property" property of the event).
>
>
> Tim
>
>   
>> Cheers,
>>
>>     
>>> Best regards.
>>> Bart
>>>
>>> [1] http://www.geoext.org/pipermail/dev/2009-July/000249.html
>>>
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>>>
>>>       
>
>
>   


-- 
Bart van den Eijnden
OSGIS, Open Source GIS
bartvde at osgis.nl
http://www.osgis.nl