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<DIV>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.</DIV>
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<DIV>(refer to these articles: <A href="http://snook.ca/archives/javascript/cross_domain_aj">http://snook.ca/archives/javascript/cross_domain_aj</A></DIV>
<DIV> and<BR><A href="http://www.xml.com/pub/a/2005/12/21/json-dynamic-script-tag.html">http://www.xml.com/pub/a/2005/12/21/json-dynamic-script-tag.html</A></DIV>
<DIV>for a description of the technique).</DIV>
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<DIV>Has anyone managed to get this to work with OpenLayers?</DIV>
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<DIV>Here is my WFS code:</DIV>
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<DIV> var parwfs = new OpenLayers.Layer.Vector("WFS Parcels", {<BR> strategies: [new OpenLayers.Strategy.BBOX()],<BR> protocol: new OpenLayers.Protocol.HTTP({<BR> url: "<A href="http://wfs.data.linz.govt.nz/MYKEY/wfs">http://wfs.data.linz.govt.nz/MYKEY/wfs</A>",<BR> headers: {"Content-Type": "plain/text"},<BR> params: {<BR> version: "1.0.0",<BR> service: "WFS",<BR> request: "GetFeature",<BR> //srsName: "EPSG:2193",<BR> maxfeatures: "5",<BR> typename: "x823",<BR> outputFormat: "json",<BR> format_options: "callback:getGeo"<BR> },<BR> format: json_format<BR> }),<BR> projection: new OpenLayers.Projection("EPSG:4326"), <BR> style: {strokeColor: "green", strokeWidth: 2, strokeOpacity: 0.5},<BR> minScale: 50000,<BR> visibility: false<BR> });<BR> map.addLayer(parwfs); </DIV>
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<DIV>How would I handle the sending to avoid it using XMLHttpRequest? And what about passing the response to a the callback function?</DIV>
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<DIV>Thanks,</DIV>
<DIV> </DIV>
<DIV>Robert Sanson</DIV>
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