json to xml transformation with x2js

Question

I am trying to transform a JSON object to XML, but i have somehow get stuck in jscript (not an expert). Here is the code:

...
var GEOJSON_PARSER = new OpenLayers.Format.GeoJSON();
var vectorLayerAsJson = GEOJSON_PARSER.write(vlayer.features);
    ...
var x2js = new X2JS();
    ...
var xmlDocStr2 = x2js.json2xml_str(vectorLayerAsJson);
alert(xmlDocStr2);
    ...
// JSON arrays to string
var xmlDoc1 = x2js.json2xml_str({
    "type": "FeatureCollection",
    "features": [{
        "type": "Feature",
        "properties": {},
        "geometry": {
            "type": "Polygon",
            "coordinates": [
                [
                    [22580, -24812],
                    [24772, -28076],
                    [27732, -24204],
                    [22580, -24812]
                ]
            ]
        }
    }]
});
alert(xmlDoc1);

In the first case the json2xml_str(vectorLayerAsJson) function returns something like a JSON object however in the second it returns the correct XML.

Both objects are identical "vectorLayerAsJson" is the one declared as "type":"FeatureCollection ..." in the second case.

I have also tried alternate ways of calling x2js.json2xml_str such as x2js.json2xml_str($.parseJSON($("vectorLayerAsJson").val())); with no success!

Any ideas?

Answer 1

It seems you are not aware Openlayers 2 is already able to write your features to XML based formats, so I'm not sure using x2js is useful (but I don't know your use case)

It can be KML, GPX, GML v2, GML v3. Those are all subsets of XML.

Read the API docs for more.

You can see a sample using your code to create GML (you can also look at Vector Formats Example)

var gml_parser_v2 = new OpenLayers.Format.GML.v2();
var gml_parser_v3 = new OpenLayers.Format.GML.v3();

vector_layer_as_gml_v2 = gml_parser_v2.write(vlayer.features);
vector_layer_as_gml_v3 = gml_parser_v3.write(vlayer.features);

console.log(vector_layer_as_gml_v2);
console.log(vector_layer_as_gml_v3);

Answer 2

are you sure your json file is well formed? try here http://www.utilities-online.info/xmltojson/#.Uql7VyeQMRc and verify first that the conversion works correctly.

Answer 3

First, be sure you don't have an UTF-8 BOM into your file. A one-liner command available here can spot and suppress it.

Another option could be switching to another js lib conversion such as JSONXML.

(If you want further support, please upload file and code online)