Why can't xml nodeValue get in javascript?

Question

if (window.DOMParser) {
    parser=new DOMParser();
    xmlDoc=parser.parseFromString(txt,"text/xml");
}
else { // Internet Explorer 
    xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async="false";
    xmlDoc.loadXML(txt); 
}
                /*copy ends*/
temp = xmlDoc.getElementsByTagName('COMMENT');
s0 = xmlDoc.getElementsByTagName('TITLE')[i].nodeValue;
s1 = xmlDoc.getElementsByTagName('CMT')[i].nodeValue;

s0 and s1 returned null, and I don't understand why?

Answer 1

The property nodeValueof XML elements is always nullbecause the contents of an element are actually stored in text nodes inside the element. If the content is simple enough, you can do something like:

s0 = xmlDoc.getElementsByTagName("TITLE")[i].firstChild.nodeValue;
s1 = xmlDoc.getElementsByTagName("CMT")[i].firstChild.nodeValue;