How to use XML Parser and get element by tagName when tag contains embedded element inside?

Question

I'm using XMLParser to get data from a tag.

This tag is like this :

<tagName elem="XXX"></tagName>

I want to get : XXX

According to documentation, I'm doing like :

    parseMyXML = new DOMParser();
    xmlDoc = parseMyXML.parseFromString(contentXML,"text/xml");

    var code_XXX = xmlDoc.getElementsByTagName("tagName")[0].childNodes[0].nodeValue;

I have an error : Uncaught (in promise) TypeError: Cannot read property 'nodeValue' of undefined

What I need is to go into tagName and to get the contain of elem

Answer 1

这是一个属性，而不是子节点。

xmlDoc.getElementsByTagName("tagName")[0].getAttribute("elem");

Answer 2

With jQuery you can do something like this.

    var $xml = $.parseXML(xml),
       value = $xml.find('tagName').text();

if you're using plain JS you should parse xml like this.

if (window.DOMParser) {
  // code for modern browsers
  parser = new DOMParser();
  xmlDoc = parser.parseFromString(text,"text/xml");
} else {
  // code for old IE browsers
xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
  xmlDoc.async = false;
  xmlDoc.loadXML(text); 
}