How Can I Parse Dynamic XML Strings in JavaScript Using Modern and Legacy Browser Compatible Methods?

XML Parsing of Dynamic Strings in JavaScript

Problem: Working with XML data often involves retrieving it as a string from dynamic sources. How can we effectively parse and manipulate this XML data using JavaScript code that is compatible with modern browsers?

Solution:

DOMParser Method

For browsers supporting the DOMParser interface, the following function provides a simple XML parsing mechanism:

function parseXml(xmlStr) {
  return new window.DOMParser().parseFromString(xmlStr, "text/xml");
}

Example usage:

var xml = parseXml('<foo>Stuff</foo>');
console.log(xml.documentElement.nodeName); // Outputs: "foo"

ActiveXObject (for Legacy IE Support)

In cases where DOMParser is unavailable, such as in Internet Explorer versions up to 8, the following code snippet provides a fallback using ActiveXObject:

var parseXml;

if (typeof window.DOMParser != "undefined") {
  parseXml = function(xmlStr) {
    return new window.DOMParser().parseFromString(xmlStr, "text/xml");
  };
} else if (typeof window.ActiveXObject != "undefined" && new window.ActiveXObject("Microsoft.XMLDOM")) {
  parseXml = function(xmlStr) {
    var xmlDoc = new window.ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async = "false";
    xmlDoc.loadXML(xmlStr);
    return xmlDoc;
  };
} else {
  throw new Error("No XML parser found");
}

jQuery Compatibility

jQuery versions 1.5 and later include a convenient $.parseXML() method that offers similar functionality:

var xml = $.parseXML('<foo>Stuff</foo>');
console.log(xml.documentElement.nodeName); // Outputs: "foo"

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