[OpenLayers-Users] Visibility of features in vector layer

[Eric Lemoine]

On Wednesday, July 8, 2009, Matthew Doyle <M.Doyle at bom.gov.au> wrote:
>
> Hello all,
>
> Sorry for resurrecting this topic, but i am having trouble getting my
> features to "remember" which StylemMap they have been changed to, using the
> renderIntent.
>
> After following Heidtmare's suggestions below, my WFS layer is now showing
> and hiding features on the fly using the renderIntent and then calling
> drawFeature, as follows:
>
> for(var i = 0; i < WFSLayer.features.length; i++) {
>    WFSLayer.features[i].renderIntent = "hidden";
>    WFSLayer.drawFeature(WFSLayer.features[i]);
> }
>
> This works great, right up until i zoom the map or move to a different
> extent. Each feature goes back to their "default" renderIntent and the
> features are shown once again.
>
> How can i force a permanent change for each feature so that when the user
> zooms it remembers what changes have just been made?

Hi

You can use the "style" property. E.g.

feature.style = OpenLayers.Feature.Vector.style["delete"];

Cheers,


>
> Many thanks in advance,
> Matt
>
> PS. I have trawled through the API/code/usergroups to no avail so far, yet
> it feels like the solution may be staring me right in the face, yet i can't
> quite see it :-)
>
>
>
> Heidtmare wrote:
>>
>> I'm assuming that when you tell it to redraw you pass it params for that
>> redraw but those params are for that redraw only.
>> When you change your zoom lvl OL is redrawing the feature with its
>> origional style settings.
>>
>> Try changing the features render intent(style setting) prior to redraw.
>>
>> var featureStyles = new OpenLayers.StyleMap({
>>       "default": OpenLayers.Feature.Vector.style["default"],
>>       "select": OpenLayers.Feature.Vector.style.select,
>>       "hidden":{
>>               fillOpacity: 0.0,
>>               strokeOpacity: 0.0
>>       }
>> });
>>
>> //then later you can
>> feature.renderIntent = 'hidden';
>> _featureLayer.drawFeature(feature);
>>
>>
>>
>> -----Original Message-----
>> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
>> On Behalf Of djud
>> Sent: Tuesday, May 05, 2009 9:16 AM
>> To: users at openlayers.org
>> Subject: Re: [OpenLayers-Users] Visibility of features in vector layer
>>
>>
>> Thanks Heidtmare,
>>
>> I will try this but I'm still concerned as to why drawing the feature
>> with
>> "display: none" doesn't work at all zoom levels.
>>
>> Dave
>>
>>
>> --
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>> 94303.html
>> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>>
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>
> --
> View this message in context: http://n2.nabble.com/Visibility-of-features-in-vector-layer-tp2792029p3224229.html
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-- 
Eric Lemoine

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