[OpenLayers-Users] Highlighting the selected geometry

Lehtonen, Mika mika at digikartta.net
Thu Sep 11 09:40:53 EDT 2008


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 -
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>>>>   
>>>>     
>>>>       
>>>>         
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