How to get data from XML parser in nodeJS

Question

I try to use nodeJS to get access to all data from an XML stored as a string in my code for now. Actually, I succeeded only getting access to the main node but not all children when i wanted to get deeper.

Here is my code, and I try to get all data in ms:IDENT node.

var http = require('http');
var xml2js = require('xml2js');

var extractedData = "";
var parser = new xml2js.Parser();

var xml = "<wfs:FeatureCollection><gml:boundedBy><gml:Box srsName='EPSG:3945'><gml:coordinates>1399644.376399,4179041.966594 1426575.406024,4209057.424111</gml:coordinates></gml:Box></gml:boundedBy><gml:featureMember><ms:SV_ARRET_P fid='SV_ARRET_P.1484'><gml:boundedBy><gml:Box srsName='EPSG:3945'><gml:coordinates>1418152.331881,4208150.797551 1418152.331881,4208150.797551</gml:coordinates></gml:Box></gml:boundedBy><ms:msGeometry><gml:Point srsName='EPSG:3945'><gml:coordinates>1418152.331881,4208150.797551</gml:coordinates></gml:Point></ms:msGeometry><ms:GID>1484</ms:GID><ms:GEOM_O>196</ms:GEOM_O><ms:IDENT>FLA92A</ms:IDENT><ms:GROUPE>FLA92</ms:GROUPE><ms:LIBELLE>Fort Lajard</ms:LIBELLE><ms:TYPE>BUS</ms:TYPE><ms:CDATE>2017-01-06T14:15:10</ms:CDATE><ms:MDATE>2017-01-06T14:15:10</ms:MDATE></ms:SV_ARRET_P></gml:featureMember></wfs:FeatureCollection>"

parser.parseString(xml, function(err,result){
  //Extract the value from the data element
  xml = result['wfs:FeatureCollection'];
  parser.parseString(xml, function(err,result){
    extractedData = result['wfs:FeatureCollection']['gml:featureMember']['ms:SV_ARRET_P']['ms:IDENT'];
    console.log(extractedData);
  });
});

Thank you for any help in advance

Are you saying extractedData is not the value you expect? Did you look at the value of result? What is its structure? Possibly a duplicate of Access / process (nested) objects, arrays or JSON. — Felix Kling
– Felix Kling, Commented Jan 7, 2017 at 1:00
Why are you parsing the XML again inside of parser.parseString(xml, ....) { ... }? you already parsed the xml, the result should be a full tree than you can access now, just consult that. — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Jan 7, 2017 at 1:11

cartant · Accepted Answer · 2017-01-07 01:11:31Z

1

With xml2js, the explicitArray option defaults to true, so all child nodes will be in an array.

You can access the value you are interested in like this (note that the second call to parseString is not required):

var parser = new xml2js.Parser();
parser.parseString(xml, function (error, result) {

    var value = result['wfs:FeatureCollection']['gml:featureMember'][0]['ms:SV_ARRET_P'][0]['ms:IDENT'][0];
    console.log(value);
});

If you specify explicitArray as false, arrays will be used only if there are multiple child nodes:

var parser = new xml2js.Parser({ explicitArray: false });
parser.parseString(xml, function (error, result) {

    var value = result['wfs:FeatureCollection']['gml:featureMember']['ms:SV_ARRET_P']['ms:IDENT'];
    console.log(value);
});

answered Jan 7, 2017 at 1:11

cartant

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