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HTML DOM Collections & Node Lists in JAVA SCRIPT

Definition and Usage HTMLCollection Object..
The getElementsByTagName() method returns an HTMLCollection object.
An HTMLCollection object is an array-like list (collection) of HTML elements.
HTML HTMLCollection Length:
The length property defines the number of elements in an HTMLCollection.
An HTMLCollection is NOT an array!
An HTMLCollection may look like an array, but it is not.
You can loop through the list and refer to the elements with a number (just like an array).
However, you cannot use array methods like valueOf(), pop(), push(), or join() on an HTMLCollection.

Definition and Usage HTML DOM NodeList Object..
A NodeList object is a list (collection) of nodes extracted from a document.
A NodeList object is almost the same as an HTMLCollection object.
Some (older) browsers return a NodeList object instead of an HTMLCollection for methods like getElementsByClassName().
All browsers return a NodeList object for the property childNodes.
Most browsers return a NodeList object for the method querySelectorAll().
HTML DOM Node List Length:
The length property defines the number of nodes in a node list.

The Difference Between an HTMLCollection and a NodeList
  • An HTMLCollection (previous chapter) is a collection of HTML elements.
  • A NodeList is a collection of document nodes.
  • A NodeList and an HTML collection is very much the same thing.
  • Both an HTMLCollection object and a NodeList object is an array-like list (collection) of objects.
  • Both have a length property defining the number of items in the list (collection).
  • Both provide an index (0, 1, 2, 3, 4, ...) to access each item like an array.
  • HTMLCollection items can be accessed by their name, id, or index number.
  • NodeList items can only be accessed by their index number.
  • Only the NodeList object can contain attribute nodes and text nodes.

A node list is not an array!
  • A node list may look like an array, but it is not.
  • You can loop through the node list and refer to its nodes like an array.
  • However, you cannot use Array Methods, like valueOf(), push(), pop(), or join() on a node list.

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