Hi Mathew
I am trying to acheive the same, but not getting anywhere.
I am using a Layer.GML with format GeoRSS.
How can i change the render intent?
Thanks
Matthew Doyle wrote:
>
> Thank you Andreas, my features are now working perfectly.
>
> For those interested in the final solution; I used Layer.Vector with a
> Fixed strategy. Once this was set up correctly I was able to modify the
> renderIntent parameter of each feature to toggle them on and off
> appropriately.
>
> var vectorLayer = new OpenLayers.Layer.Vector("Pacific Stations", {
> strategies: [new OpenLayers.Strategy.Fixed()],
> styleMap: pacificStyleMap,
> protocol: new OpenLayers.Protocol.HTTP({
> url: "...",
> format: new OpenLayers.Format.GML()
> })
> });
>
> Big thanks to all who responded and helped,
>
> Best regards,
> Matt
>
>
> -----Original Message-----
> From: Andreas Hocevar [mailto:[email protected]]
> Sent: Saturday, 11 July 2009 7:17 AM
> To: Matthew Doyle; users
> Subject: Re: [OpenLayers-Users] Visibility of features in vector layer
> [SEC=UNCLASSIFIED]
>
> Matthew Doyle wrote:
>> Thanks Andreas! Should I be using Layer.Vector instead then?
>
> Either Layer.Vector with a Fixed strategy, or, if you do not want to
> change a lot of code, just use Layer.GML instead of Layer.WFS. But the
> disadvantage is that it will load all features from your server, which
> will be slow if you have more than ~100 features.
>
> Regards,
> Andreas.
>
>> I'll give the stylemap-context a go first and let you know how I get on.
>> Thanks again.
>>
>> Cheers,
>> Matt
>>
>> -----Original Message-----
>> From: [email protected] [mailto:[email protected]] On
>> Behalf Of Andreas Hocevar
>> Sent: Thursday, 9 July 2009 8:10 PM
>> To: Matthew Doyle; [email protected]
>> Subject: Re: [OpenLayers-Users] Visibility of features in vector layer
>>
>> hi,
>>
>> the reason why it does not work is that you are using Layer.WFS, which
>> will load features for the visible extent after a pan/zoom. This means
>> that your modified features get removed, and replaced by fresh ones from
>> the server..
>>
>> I see that you set the visibility based on a feature attribute. In this
>> case it would be best to set the visibility with a context in the
>> stylemap. See the stylemap-context.html example to see what I mean.
>>
>> Regards,
>> Andreas.
>>
>> On 7/9/09, Matthew Doyle <[email protected]> wrote:
>>> Hi Eric, Andreas and Paul,
>>>
>>> Many thanks for getting back to me, and thanks for the suggestions. I
>>> have tried both ways, and the features still don't remember which
>>> renderIntent or "style" they have been changed to, always reverting back
>>> to the default.
>>>
>>> Andreas - I did have a styleMap called "hidden" but i've now renamed
>>> that to "delete" as suggested, I had assumed you could create your
>>> own renderIntent names paired with Style objects, now I realise it's
>>> best to stick with default, selected and delete.
>>>
>>> Here's my code: I hope you can perhaps see where I am going wrong?
>>> First, the StyleMaps and WFS Layer instantiation:
>>>
>>> var pacificStyleMap = new OpenLayers.StyleMap({
>>> "default": {
>>> externalGraphic : "/ol/img/capital-city.png",
>>> cursor: "pointer",
>>> graphicWidth : 10,
>>> graphicHeight : 10,
>>> graphicXOffset : -6,
>>> graphicYOffset : -6,
>>> graphicOpacity : 1
>>> },
>>> "select": {
>>> externalGraphic : "/ol/img/capital-city.png",
>>> cursor: "pointer",
>>> graphicWidth : 12,
>>> graphicHeight : 12,
>>> graphicXOffset : -7,
>>> graphicYOffset : -7,
>>> graphicOpacity : 1
>>> },
>>> "delete": {
>>> display: "none"
>>> }
>>> });
>>>
>>> pacificWFS = new OpenLayers.Layer.WFS('Weather Stations',
>>> OpenLayers.serviceURL, {typename: 'PI-STATIONS', format:
>>> OpenLayers.Format.WFS}, {
>>> extractAttributes: true,
>>> displayOutsideMaxExtent: true,
>>> styleMap: pacificStyleMap
>>> });
>>>
>>>
>>> (... and then the function which is trying to hide/show the features)
>>>
>>>
>>> function toggleDataType(dataType) {
>>> var renderIntent;
>>> for(var i = 0; i< pacificWFS.features.length; i++) {
>>> if(dataType == "rain") {
>>> if(pacificWFS.features[i].attributes.rain != "True") {
>>> renderIntent = "delete";
>>> } else {
>>> renderIntent = "default";
>>> }
>>> } else if(dataType == "tmax") {
>>> if(pacificWFS.features[i].attributes.tmax != "True") {
>>> renderIntent = "delete";
>>> } else {
>>> renderIntent = "default";
>>> }
>>> }
>>> pacificWFS.features[i].renderIntent = renderIntent;
>>> pacificWFS.drawFeature(pacificWFS.features[i]);
>>> }
>>> }
>>>
>>>
>>> The toggleDataType(dataType) is called onclick from a drop-down menu,
>>> all is working well with this as i have debugged the code thoroughly.
>>> I have 30 features, and they have differing dataType attributes.
>>>
>>> I hope you guys can spot something that i'm missing here.
>>>
>>> I have also tried Eric's suggestion:
>>> pacificWFS.features[i].style =
>>> OpenLayers.Feature.Vector.style["delete"];
>>> instead of setting the renderIntent at the bottom of the loop. In
>>> either method, the features do hide, but as soon as i pan around or
>>> zoom (causing a
>>> redraw) then the features come back.
>>>
>>> Best regards,
>>> Matt
>>>
>>>
>>>
>>>
>>>
>>> Eric Lemoine-2-2 wrote:
>>>> On Wednesday, July 8, 2009, Paul Spencer <[email protected]> wrote:
>>>>> Eric,
>>>>>
>>>>> On 8-Jul-09, at 9:25 AM, Eric Lemoine wrote:
>>>>>
>>>>>
>>>>> On Wednesday, July 8, 2009, Matthew Doyle <[email protected]> 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"];
>>>>>
>>>>>
>>>>>
>>>>> why does the renderIntent approach not work? It does work for
>>>>> controls like SelectFeature. From what I see in the code, the
>>>>> renderIntent of the feature is changed in createSymbolizer called
>>>>> from drawFeature, which should use the renderIntent of the feature (in
>>>>> this case, 'hidden').
>>>>> Unless the style map doesn't contain a 'hidden' style, in which
>>>>> case it would default back to ... um ... 'default' :)
>>>>
>>>> I agree with your reasonning Paul - setting feature.renderIntent to
>>>> "delete" should work equally.
>>>>
>>>>
>>>>> Paul
>>>>>
>>>>>
>>>> --
>>>> Eric Lemoine
>>>>
>>>> Camptocamp France SAS
>>>> Savoie Technolac, BP 352
>>>> 73377 Le Bourget du Lac, Cedex
>>>>
>>>> Tel : 00 33 4 79 44 44 96
>>>> Mail : [email protected]
>>>> http://www.camptocamp.com
>>>> _______________________________________________
>>>> Users mailing list
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>>>> http://openlayers.org/mailman/listinfo/users
>>>>
>>>>
>>> --
>>> View this message in context:
>>> http://n2.nabble.com/Visibility-of-features-in-vector-layer-tp2792029
>>> p 3228871.html Sent from the OpenLayers Users mailing list archive at
>>> Nabble.com.
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>>
>> --
>> Sent from my mobile device
>>
>> Andreas Hocevar
>> OpenGeo - http://opengeo.org/
>> Expert service straight from the developers.
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
> _______________________________________________
> Users mailing list
> [email protected]
> http://openlayers.org/mailman/listinfo/users
>
>
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