[OpenLayers-Users] Highlighting the selected geometry
Lehtonen, Mika
mika at digikartta.net
Thu Sep 11 11:03:00 EDT 2008
Updated version. This works with OL 2.6 but not with 2.7-RC1 (in IE6-7
and FF2-3) if everything is written in one line without spaces. Why
doesn't it work with 2.7-RC1? Note the variable!
FILTER: '<wfs:FeatureCollection xmlns:wfs="http://www.opengis.net/wfs"
xmlns:ogc="http://www.opengis.net/ogc" service="WFS" version="1.1.0"
xmlns:gml="http://www.opengis.net/gml"><gml:featureMember><ogc:Filter><ogc:Contains><ogc:PropertyName>the_geom</ogc:PropertyName><gml:Point><gml:coordinates>*'+hiirixy+'*</gml:coordinates></gml:Point></ogc:Contains></ogc:Filter></gml:featureMember></wfs:FeatureCollection>'
I am using MapFish. Does it infuence on this somehow?
mika
Lehtonen, Mika kirjoitti:
> Shouldn't be braging about too early. Now I get this:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <ows:ExceptionReport version="1.0.0"
> xsi:schemaLocation="http://www.opengis.net/ows
> http://karsamaki.digikartta.net:80/asemakaavat/schemas/ows/1.0.0/owsExceptionReport.xsd"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:ows="http://www.opengis.net/ows">
> <ows:Exception exceptionCode="NoApplicableCode"
> locator="org.vfny.geoserver.util.requests.readers.XmlRequestReader">
> <ows:ExceptionText>org.xml.sax.SAXParseException:
> Content is not allowed in prolog. Content is not
> allowed in prolog.</ows:ExceptionText>
> </ows:Exception>
> </ows:ExceptionReport>
>
> Maybe a geoserver issue, but any thoughts..?
>
> - mika -
>
> Lehtonen, Mika kirjoitti:
>
>> I got it working. Not the highlighting, but GetFeature. Those of you who
>> don't know what I have been up to, I've been trying to do what is done
>> in http://www.openlayers.org/dev/examples/getfeatureinfo.html , but with
>> GetFeature. With this code I get feature's data by clicking it like in
>> that example. You can decode the filter e.g. in
>> http://meyerweb.com/eric/tools/dencoder/ . What was wrong with other
>> browsers than FF3, was that I forgot apostrophes off around the filter
>> declaration. In FF3, I noticed that it doesn't care about URL encoding,
>> just stick your staff into it as it is.
>>
>> cheers,
>> mika
>>
>> map.events.register('click', null, function (e) {
>> OpenLayers.Util.getElement('nodelist').innerHTML = "Please wait...";
>> var hiiri = wfs.map.getLonLatFromPixel(e.xy);
>> var hiirixy = (hiiri.lat+','+hiiri.lon);
>>
>> var url = wfs.getFullRequestString({
>> SERVICE: 'WFS',
>> VERSION: '1.1.0',
>> REQUEST: 'GetFeature',
>> OUTPUTFORMAT: 'json',
>> PROPERTYNAME: 'the_geom,LAYER',
>> MAXFEATURES: 5,
>> TYPENAME: 'dikanet:karsa_region',
>> SRSNAME: 'EPSG:2393',
>> FILTER:
>> '%3Cwfs%3AFeatureCollection%20xmlns%3Awfs%3D%22http%3A//www.opengis.net/wfs%22%3E%3Cgml%3AfeatureMember%20xmlns%3Agml%3D%22http%3A//www.opengis.net/gml%22%3E%3CFilter%3E%3CContains%3E%3CPropertyName%3Ethe_geom%3C/PropertyName%3E%3Cgml%3APoint%3E%3Cgml%3Acoordinates%3E%7Bhiirixy%7D%3C/gml%3Acoordinates%3E%3C/gml%3APoint%3E%3C/Contains%3E%3C/Filter%3E%3C/gml%3AfeatureMember%3E%3C/wfs%3AFeatureCollection%3E'
>> },"http://karsamaki.digikartta.net/asemakaavat/wfs"
>> );
>>
>> OpenLayers.loadURL(url,'',this,yourFunction);
>> Event.stop(e);
>> });
>>
>> function yourFunction(response) { // this will only zoom into selected feature..
>> // alert(response.responseText);
>> g = new OpenLayers.Format.JSON();
>> jsonni = g.read(response.responseText);
>> var rajat = new OpenLayers.Bounds(jsonni.bbox[0],jsonni.bbox[1],jsonni.bbox[2],jsonni.bbox[3]);
>> map.zoomToExtent(rajat);
>>
>> };
>>
>> Lehtonen, Mika kirjoitti:
>>
>>
>>> Hi Brad,
>>>
>>> cool site you have!
>>>
>>> You know, I went on with my own style, as stubborn is my middle name.. I
>>> got my code working so far; to get JSON out of the selected polygon
>>> (nice thing to move on .. ;-) ), but...
>>> you don't happen to know how I'll get this working also in IE. Here is
>>> the snippet. I guess it got something to do with the URL encoding ...?
>>> Debugger blames the filter, which obviously is the guilty one. (IE excl.
>>> :-) ).
>>>
>>> map.events.register('click', null, function (e) {
>>> OpenLayers.Util.getElement('nodelist').innerHTML = "Odota hetki...";
>>> var hiiri = wfs.map.getLonLatFromPixel(e.xy);
>>> var hiirixy = (hiiri.lat+','+hiiri.lon);
>>>
>>> var url = wfs.getFullRequestString({
>>> SERVICE: 'WFS',
>>> VERSION: '1.1.0',
>>> REQUEST: 'GetFeature',
>>> OUTPUTFORMAT: 'json',
>>> PROPERTYNAME: 'the_geom,LAYER',
>>> MAXFEATURES: 5,
>>> TYPENAME: 'dikanet:karsa_region',
>>> SRSNAME: 'EPSG:2393',
>>> FILTER: <wfs:FeatureCollection
>>> xmlns:wfs="http://www.opengis.net/wfs"><gml:featureMember
>>> xmlns:gml="http://www.opengis.net/gml"><Filter>
>>>
>>> <Contains><PropertyName>the_geom</PropertyName><gml:Point><gml:coordinates>{hiirixy}</gml:coordinates></gml:Point></Contains>
>>> </Filter></gml:featureMember></wfs:FeatureCollection>
>>> },
>>> "http://karsamaki.digikartta.net/asemakaavat/wfs"
>>> );
>>> ..............................................
>>>
>>> OpenLayers.loadURL(url,'',this,testJSON);
>>> Event.stop(e);
>>> });
>>>
>>> ............................................
>>> function testJSON (response) {
>>> // alert(response.responseText);
>>> g = new OpenLayers.Format.JSON();
>>> jsonni = g.read(response.responseText);
>>> var rajat = new
>>> OpenLayers.Bounds(jsonni.bbox[0],jsonni.bbox[1],jsonni.bbox[2],jsonni.bbox[3]);
>>> map.zoomToExtent(rajat);
>>> };
>>> ..........................................................
>>> Doesn't do anything else so far than zooms into the selected polygon.
>>>
>>> - mika -
>>>
>>>
>>> Brad Spencer kirjoitti:
>>>
>>>
>>>
>>>> Mika,
>>>>
>>>> I typically use getFeature when I need the geometry as well and one way to
>>>> reduce the number of polygons returned is to set up a Shift-drag event that
>>>> can be used to reduce the BBox of the GetFeature request to be limited to
>>>> the user's discretion. However, this will be a rectangle and will probably
>>>> still return more or less polygons than you need. The request I use
>>>> typically looks something like this:
>>>>
>>>> &typename=MESHBLOCKS&datastore=ABS&service=wfs&request=GetFeature&filter=<Fi
>>>> lter><BBOX><Box><coordinates>151.042611,-33.947448%20151.043,-33.9</coordina
>>>> tes></Box></BBOX></Filter>&outputformat=BXFS
>>>>
>>>> This returns an GML file into DOM that I can parse to get all the
>>>> coordinates of the polygons returned.
>>>>
>>>> However, if you are interacting via a single clicking process and do not
>>>> need the geometry then all you need is a getFeatureInfo request. I have
>>>> built an application that does this see
>>>> http://demos.numaps.com.au/polypika.html. Just doubleclick any red polygon
>>>> and what happens in the background is the click generates a getFeatureInfo
>>>> request which looks something like:
>>>>
>>>> REQUEST=GetFeatureInfo&VERSION=1.1.3&SERVICE=WMS&SRS=EPSG:900913&BBOX=128495
>>>> 99.340828,-3816959.290073,12980306.659172,-3708418.709927&X=474&Y=369&QUERY_
>>>> LAYERS=INDIGENOUS_LOC:ABS&WIDTH=855&HEIGHT=710&RADIUS=0&FEATURE_COUNT=1&INFO
>>>> _FORMAT=text/xml
>>>>
>>>> This returns a an XML file into the DOM which I can parse to get the Polygon
>>>> Id. Then I do the SLD thing.
>>>>
>>>> Hope these suggestions help you.
>>>>
>>>> Cheers, Brad Spencer....
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] On
>>>> Behalf Of Lehtonen, Mika
>>>> Sent: Tuesday, September 09, 2008 10:43 PM
>>>> To: Openlayers Users List
>>>> Subject: Re: [OpenLayers-Users] Highlighting the selected geometry
>>>>
>>>> Yep,
>>>> thanks. I am using Geoserver so SLD approach is ok. One stupid question.
>>>> I started to play around with GetFeature, but how can you get just the
>>>> feature you clicked. I tried something similar like in OL example [1],
>>>> but with GetFeature and WFS. So the following is what I tried:
>>>>
>>>> map.events.register('click', null, function (e) {
>>>> OpenLayers.Util.getElement('nodelist').innerHTML = "Odota hetki...";
>>>> var url = wfs.getFullRequestString({
>>>> SERVICE: 'WFS',
>>>> VERSION: '1.0.0',
>>>> REQUEST: 'GetFeature',
>>>> OUTPUTFORMAT: 'text/xml; subtype=gml/2.1.2',
>>>> PROPERTYNAME: 'LAYER',
>>>> MAXFEATURES: 3,
>>>> TYPENAME: 'dikanet:karsa_region',
>>>> SRSNAME: 'EPSG:2393',
>>>> BBOX: wfs.map.getExtent().toBBOX()},
>>>> "http://karsamaki.digikartta.net/asemakaavat/wfs"
>>>> );
>>>> OpenLayers.loadURL(url,'',this,setHTML);
>>>> Event.stop(e);
>>>> });
>>>>
>>>> function setHTML(response) {
>>>> OpenLayers.Util.getElement('nodelist').innerHTML =
>>>> response.responseText;
>>>> };
>>>>
>>>> But this gives me all the feautures in the current viewport. How can I
>>>> filter out the rest and just take the one I clicked?
>>>>
>>>> - mika -
>>>>
>>>> [1] http://www.openlayers.org/dev/examples/getfeatureinfo.html
>>>>
>>>> Brad Spencer kirjoitti:
>>>>
>>>>
>>>>
>>>>
>>>>> Mika,
>>>>>
>>>>> Does the map server support (style Layer descriptors) SLDs? If so this is
>>>>> the best way to highlight polygons in my experience. Vectors may misalign
>>>>> depending on browsers/projections. Also there are capacity limits on
>>>>>
>>>>>
>>>>>
>>>>>
>>>> vectors
>>>>
>>>>
>>>>
>>>>
>>>>> at the client which can be problematic. The easiest way to make sure this
>>>>> does not happen is to have the layer render again via a new SLD. What I do
>>>>> is run a GetFeatureinfo(WMS) or getfeaturte(WFS) bring back the list of
>>>>> polygons (must have unique identifiers) then I build an SLD on the fly via
>>>>>
>>>>>
>>>>>
>>>>>
>>>> a
>>>>
>>>>
>>>>
>>>>
>>>>> PHP script save it and then apply that to the current layer. Of course if
>>>>> you have the polygon names already accessible in the client (e.g. in a
>>>>> select box) then you can just jump to the SLD building part. Works a
>>>>>
>>>>>
>>>>>
>>>>>
>>>> treat.
>>>>
>>>>
>>>>
>>>>
>>>>> Cheers, Brad....
>>>>>
>>>>> -----Original Message-----
>>>>> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
>>>>>
>>>>>
>>>>>
>>>>>
>>>> On
>>>>
>>>>
>>>>
>>>>
>>>>> Behalf Of Lehtonen, Mika
>>>>> Sent: Tuesday, September 09, 2008 5:02 PM
>>>>> To: Openlayers Users List
>>>>> Subject: [OpenLayers-Users] Highlighting the selected geometry
>>>>>
>>>>> Hi,
>>>>>
>>>>> is there any examples available which I could use with the following
>>>>> task? Tried to google, but didn't find any good ones.
>>>>>
>>>>> I have two wms-layers in my map. The another one includes some polygons.
>>>>> In order to get some info out when clicking the polygon, I built a
>>>>> system which does that. But I would also like to get the selected
>>>>> polygon to render with a different style, so that it'd be sort of
>>>>> highlighted. I thought I could copy it into vector layer having
>>>>> different style. But frankly said, I don't know how to do it. Just
>>>>> learning OL.
>>>>>
>>>>> - mika -
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>> Users at openlayers.org
>>>>> http://openlayers.org/mailman/listinfo/users
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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