DOM Node Info in XML

In the XML DOM, every part of the XML document is represented as a node. Each node has properties that describe its type, name, value, and relationship to other nodes.

Key Node Properties

Common nodeType Values

Example: Inspect Node Info

const book = xmlDoc.getElementsByTagName("book")[0];// Node typeconsole.log(book.nodeType);        // 1 (ELEMENT_NODE)// Node nameconsole.log(book.nodeName);        // "book"// Node value (for elements usually null)console.log(book.nodeValue);       // null// Access first child (e.g. <title>)const firstChild = book.firstChild;console.log(firstChild.nodeName);  // could be "#text" (whitespace) or "title"// To get the first element child ignoring whitespace:const firstElementChild = book.firstElementChild;console.log(firstElementChild.nodeName); // "title"// For a text node inside <title>const titleTextNode = firstElementChild.firstChild;console.log(titleTextNode.nodeType);  // 3 (TEXT_NODE)console.log(titleTextNode.nodeValue); // The text content of title

Use Case: Filtering Element Nodes Only

When looping over .childNodes, you often want to skip text or comment nodes:

for(let i = 0; i < book.childNodes.length; i++) {  const node = book.childNodes[i];  if(node.nodeType === 1) { // ELEMENT_NODE    console.log(node.nodeName); // logs element names only  }}

Summary

• NodeType helps identify what kind of node you’re dealing with.

• NodeName gives the name of element or #text for text nodes.

• NodeValue holds text for text nodes, null for elements.

• Use these to programmatically examine or manipulate XML content.

If you want, I can provide code examples for working with specific node types or handling mixed content!