[OpenLayers-Users] Using Cross Domain JSON to get around a proxy issue

[Robert Sanson]

I am wanting to access a WFS data service outside our company's network, and I have been having trouble trying to get my proxy to work through our firewall. One possible solution is to use Cross Domain JSON to get around this. The WFS server I want to access can return JSON wrapped in a callback function if requested, by appending: &outputFormat=json&format_options=callback:myCallback to the URL.
 
(refer to these articles: http://snook.ca/archives/javascript/cross_domain_aj 
 and
http://www.xml.com/pub/a/2005/12/21/json-dynamic-script-tag.html 
for a description of the technique).
 
Has anyone managed to get this to work with OpenLayers?
 
Here is my WFS code:
 
    var parwfs = new OpenLayers.Layer.Vector("WFS Parcels", {
      strategies: [new OpenLayers.Strategy.BBOX()],
      protocol: new OpenLayers.Protocol.HTTP({
      url: "http://wfs.data.linz.govt.nz/MYKEY/wfs",
      headers: {"Content-Type": "plain/text"},
      params: {
         version: "1.0.0",
         service: "WFS",
         request: "GetFeature",
         //srsName: "EPSG:2193",
         maxfeatures: "5",
         typename: "x823",
         outputFormat: "json",
         format_options: "callback:getGeo"
      },
      format: json_format
      }),
      projection: new OpenLayers.Projection("EPSG:4326"), 
      style: {strokeColor: "green", strokeWidth: 2, strokeOpacity: 0.5},
      minScale: 50000,
      visibility: false
    });
    map.addLayer(parwfs); 
 
How would I handle the sending to avoid it using XMLHttpRequest? And what about passing the response to a the callback function?
 
Thanks,
 
Robert Sanson
 


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