AW: [OpenLayers-Users] How to make Openlayers to request thevector data every manipulation of map

[Bartłomiej Burkot]

Hi Arnd

Thank you for your fast feedback and for solving my problem.
After your answer I googled about resFactor and I found another 
api-documentation as the official on Openlayers homepage.
I asked about it becouse it was confusing for me.

Thanks twice

Bartek

W dniu 2012-03-09 17:33, Arnd Wippermann pisze:
> Hi Bartek,
> keep in mind, that OpenLayers is an Open Source Project.
> Many people have spend their free time to develop OpenLayers
> and it's up to them, how they spend their free time.
> But it's possible for everyone to contribute to OpenLayers.
> http://trac.osgeo.org/openlayers/wiki/HowToContribute
> Arnd
> ------------------------------------------------------------------------
> *Von:* openlayers-users-bounces at lists.osgeo.org 
> [mailto:openlayers-users-bounces at lists.osgeo.org] *Im Auftrag von 
> *Bartlomiej Burkot
> *Gesendet:* Freitag, 9. März 2012 08:43
> *Cc:* users at openlayers.org
> *Betreff:* Re: AW: [OpenLayers-Users] How to make Openlayers to 
> request thevector data every manipulation of map
>
> Perfectly Arnd
>
> why couldn't I find this option in official apidoc?
> http://dev.openlayers.org/releases/OpenLayers-2.11/doc/apidocs/files/OpenLayers/Strategy/BBOX-js.html
> http://dev.openlayers.org/docs/files/OpenLayers/Strategy/BBOX-js.html#OpenLayers.Strategy.BBOX.resFactor
> Why is difference between this docs?
>
> Bartek
>
>
>> maybe adding the param resFactor to the BBOX.Strategy will solve your 
>> problem.
>> strategies: [new OpenLayers.Strategy.BBOX({ratio: 1.1, resFactor:1})],
>> Arnd
>>
>> ------------------------------------------------------------------------
>> *Von:* openlayers-users-bounces at lists.osgeo.org 
>> [mailto:openlayers-users-bounces at lists.osgeo.org] *Im Auftrag von 
>> *Bartlomiej Burkot
>> *Gesendet:* Donnerstag, 8. März 2012 16:57
>> *An:* openlayers-users at lists.osgeo.org
>> *Betreff:* [OpenLayers-Users] How to make Openlayers to request the 
>> vector data every manipulation of map
>>
>> Hello,
>>
>> I think I have exactly the same problem. I have vector layer with 
>> many points-markers. I need to limit the number of fetched points 
>> from server becouse of performance.
>> The vectorlayer use bbox strategy and protocol HTTP:
>>
>> weather_points_layer = new OpenLayers.Layer.Vector("Wetterpunkte", {
>>
>>                 strategies: [new OpenLayers.Strategy.BBOX({ratio: 
>> 1.1})],
>>
>>                 protocol: new OpenLayers.Protocol.HTTP({
>>                     url: "text_layer_generator/weather_points.php"
>>                 ..
>>                 })
>>             });
>>
>> The script: weather_points.php limits the number of points using bbox 
>> parameter and LIMIT statement in sql query.
>> There is the working example: http://mapakrakow.pl/pogoda/test.php
>> When I zoomin the points are not fetched from server but from browser 
>> cache. Problem is that when you zoomin to - for example  Berlin - you 
>> don't see any points. There is not any request in firebug fetching 
>> the data.
>>
>> Running this command:
>> weather_points_layer.refresh({force:true});
>> in firebug console Openlayers requests and refreshes the data from 
>> server correctly and shows points over Berlin.
>> I tryed to change cache-control headers in weather_points.php:
>>
>> #header("Cache-Control: max-age=2"); // HTTP/1.1
>> #header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
>> #header("Pragma: Cache"); // required
>> //header("connection: close");
>> //Keep-Alive    timeout=2, max=100
>>
>> and add the refresh strategy:
>> strategies: [new OpenLayers.Strategy.BBOX({ratio: 1.1}), new 
>> OpenLayers.Strategy.Refresh()],
>>
>> but both didn't helped.
>> I fond this article: 
>> http://stackoverflow.com/questions/2995238/how-to-refresh-reload-a-kml-layer-in-openlayers-dynamic-kml-layer
>> But I don't need to refresh vectorlayer in constant time interval but 
>> every time when user manipulates the map.
>>
>> Has someone experience how to solve this problem?
>> Thanks for your help.
>>
>> Bartlomiej Burkot
>>
>>
>> W dniu 2012-03-07 16:56, Jan Hartmann pisze:
>>> No, it tried that. According to the documentation, the redraw 
>>> function does not take a parameter.
>>>
>>> Jan
>>>
>>> On 03/07/2012 04:45 PM, Steve.Toutant at inspq.qc.ca wrote:
>>>>
>>>> Is this working?
>>>> vectorLayer.redraw(true);
>>>>
>>>>
>>>>
>>>>
>>>> *Jan Hartmann <j.l.h.hartmann at uva.nl>@lists.osgeo.org*
>>>> Envoyé par : openlayers-users-bounces at lists.osgeo.org
>>>>
>>>> 2012-03-07 10:27
>>>>
>>>> 	
>>>> A
>>>> 	openlayers-users at lists.osgeo.org
>>>> cc
>>>> 	
>>>> Objet
>>>> 	[Polluriel potentiel]  [OpenLayers-Users] force update markers layer
>>>>
>>>>
>>>>
>>>> 	
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Hi,
>>>>
>>>> How do I force a redraw on a markers layer? I have a regular WMS 
>>>> map with markers that have their lonlat-values updated from a 
>>>> database. I can force a redraw of the WMS layer with 
>>>> mergenewparams(), but that is not possible with the markers layer. 
>>>> That means that the when the lonlat values are updated and I move 
>>>> the map, the markers remain in their original positions. Only when 
>>>> I zoom in or out, the marker positions are updated. Can I do 
>>>> something about that?
>>>>
>>>> Jan_______________________________________________
>>>> Users mailing list
>>>> Users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>>>
>>>>
>>>>
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
>>
>

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