2

First time trying to draw an Openlayers map with GeoJSON instead of WMS, and not having much luck. My layer is hosted in Geoserver and is named 'sections', in a workspace called 'basic_map'. This is my code so far:

var vectorLayer = new ol.layer.Vector({
    source: new ol.source.Vector({
    url: 'http://localhost:8082/geoserver/basic_map/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=basic_map:sections&maxFeatures=50&outputFormat=application%2Fjson',
    format: new ol.format.GeoJSON(),
    crossOrigin: 'anonymous',
    })
    });

 var mapcentre= ol.proj.transform([157.83430,-33.07209],
'EPSG:4326', 'EPSG:3857');

  var map = new ol.Map({
    layers: [

      vectorLayer
    ],
    target: 'map',
    view: new ol.View({
      center: mapcentre,
      zoom: 14
    })
  });

The URL link is just copied from the layer preview, which I'm not sure on as some examples use wfs instead.

The developer console also shows an error saying 'Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8082/geoserver/basic_map/ows?.........'

1

Check this out: http://suite.opengeo.org/docs/latest/sysadmin/cors/index.html

You need to either enable JSONP for GeoServer, or set up cross origin resource sharing.

It's about the same complexity to do both, so I suggest setting up CORS.

  • 1
    Cheers. There is a jetty-servlet.jar file already included by default in the Geoserver/lib folder, that link you have references a jetty-servletS.jar file to be put into C:\Program Files (x86)\Boundless\OpenGeo\jetty\lib. Is there any difference? I also don't have Opengeo suite. – Bill Apr 19 '17 at 6:11
  • Hey @Bill, the opengeosuite doco should be similar for GeoServer. Just follow step one in the URL above. – Alex Leith Apr 19 '17 at 23:36
  • I'm finding that by adding that <filter> and <filter-mapping> text into my web.xml file, Geoserver won't start after being shutdown, and will start only if I remove the text. I've also changed (in the same web.xml file) ENABLE_JSONP to be true. Any more ideas? Its definitely not an out-of-the-box program! – Bill Apr 20 '17 at 0:32
  • Are you running TOMCAT or JETTY? I know it can be fiddly to do these things... but when it's working it will just keep working! – Alex Leith Apr 20 '17 at 2:05
  • Its JETTY, and the Geoserver version is 2.11.0. Cheers – Bill Apr 20 '17 at 3:11
2

Thanks to Alex Leith below for putting me on the right track...the fix was slightly different so I'll give the details:

  1. Entered this script into web.xml, found in C:\Program Files (x86)\GeoServer 2.10.1\webapps\geoserver\WEB-INF (sorry the HTML tags are not displaying):

    cross-origin org.eclipse.jetty.servlets.CrossOriginFilter
    cross-origin /*

  2. Download and copy jetty-servlets-9.2.13.v20150730.jar into C:\Program Files (x86)\GeoServer 2.10.1\webapps\geoserver\WEB-INF\lib, NOT the path mentioned in the OpenGeo Suite docs. Also I was a bit confused as I already had a .jar file called 'jetty-servlet-', without the 's'. Which is not the same thing.

  3. For good measure, I removed the comment markers from this code in the web.xml file, and set it as 'true', eg.

    ENABLE_JSONP true

  4. For the URL in the openlayers ol.source.Vector/ ol.format.GeoJSON, I just copied the URL from the layer preview. Eg.

    var vectorLayer = new ol.layer.Vector({ source: new ol.source.Vector({ format: new ol.format.GeoJSON(), crossOrigin: 'anonymous', url: http://localhost:8082/geoserver/basic_map/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=basic_map:sections&maxFeatures=50&outputFormat=application%2Fjson',

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