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:* [email protected]
[mailto:[email protected]] *Im Auftrag von
*Bartlomiej Burkot
*Gesendet:* Donnerstag, 8. März 2012 16:57
*An:* [email protected]
*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, [email protected] wrote:
Is this working?
vectorLayer.redraw(true);
*Jan Hartmann <[email protected]>@lists.osgeo.org*
Envoyé par : [email protected]
2012-03-07 10:27
A
[email protected]
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
[email protected]
http://lists.osgeo.org/mailman/listinfo/openlayers-users
_______________________________________________
Users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/openlayers-users
_______________________________________________
Users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/openlayers-users
