How to get a nodelist from XML xpath

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I am trying to get a list of nodes as a result of a XPath in JavaScript, but do not know how to do it. Unfortunately, I have tried a lot without any knowledge of how to do it - the alert does not come.

So how to get a list of nodes from evaluate?

XML

<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:ccts="urn:oasis:names:specification:ubl:schema:xsd:CoreComponentParameters-2" xmlns:sdt="urn:oasis:names:specification:ubl:schema:xsd:SpecializedDatatypes-2" xmlns:udt="urn:un:unece:uncefact:data:specification:UnqualifiedDataTypesSchemaModule:2" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2 UBL-Invoice-2.0.xsd">
	<cbc:ID>A00095678</cbc:ID>
	<cac:ContractDocumentReference>
		<cbc:ID>234</cbc:ID>
		<cbc:IssueDate>2007-02-20</cbc:IssueDate>
	</cac:ContractDocumentReference>
	<cac:ContractDocumentReference>
		<cbc:ID>234</cbc:ID>
		<cbc:IssueDate>2007-02-21</cbc:IssueDate>
	</cac:ContractDocumentReference>
	</cac:AdditionalDocumentReference>
	<cac:AdditionalDocumentReference>
		<cbc:ID>678</cbc:ID>
		<cbc:IssueDate>2007-02-22</cbc:IssueDate>
		<cbc:XPath>/ContractDocumentReference[ID='234']</cbc:XPath>
	</cac:AdditionalDocumentReference>
</Invoice>

What I have tried:

JavaScript

var parser = new DOMParser();
var xml = parser.parseFromString(data.d.FXml, "text/xml");

var resolver = null;
var xpath;
var ns = xml.children[0].getAttribute("xmlns:xsi");
if (ns) {
    resolver = function () {
        return ns;
    }
    xpath = "defaultnamespace:" + xpath;
}

var es = xml.evaluate("/ContractDocumentReference[ID='234']", xml, resolver, XPathResult.ANY_TYPE, null);

var node = null;
while (node = es.iterateNext()) {
    alert(node.childNodes[0].nodeValue);
}

Posted 30-Oct-23 23:24pm

MichaelEriksen

Updated 1-Nov-23 10:18am

Deeksha Shenoy

v2

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M Imran Ansari · Accepted Answer · 2023-10-31T20:55:00

To retrieve a list of nodes using XPath in JavaScript, you can try using the document.evaluate() method. This updated code snippet will select all cac:ContractDocumentReference nodes with cbc:ID equal to '234' from the provided XML. Adjust the XPath expression and the node parsing logic based on your specific requirements.

JavaScript

const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlString, 'text/xml');
const select = xpath => {
  const resolver = xmlDoc.createNSResolver(xmlDoc.documentElement);
  const result = xmlDoc.evaluate(
    xpath,
    xmlDoc,
    resolver,
    XPathResult.ANY_TYPE,
    null
  );

  const nodes = [];
  let node = result.iterateNext();
  while (node) {
    nodes.push(node);
    node = result.iterateNext();
  }
  return nodes;
};

const nodes = select("//cac:ContractDocumentReference[cbc:ID='234']");

nodes.forEach(node => {
  const id = node.querySelector('cbc\\:ID').textContent;
  const issueDate = node.querySelector('cbc\\:IssueDate').textContent;
  console.log(`ID: ${id}, Issue Date: ${issueDate}`);
});