JavaScript Reference
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Quick Reference

The Element isEqualNode() returns true if two elements are equal.

To be equal they must have the:

  • Same nodeType
  • Same nodeName
  • Same nodeValue
  • Same nameSpaceURI
  • Same childNodes with all the descendants
  • Same attributes and attribute values
  • Same localName and prefix

Note

A node can be an HTML element (div, span, p, h2, etc.), or it can be a text node (plain text, white space, a teb, a linebreak). Whereas, when referring just to an element, only the HTML elements are relevant.

<!-- lists to compare -->
<ul id="my_list1"><li>Lamborghini</li><li>Ferrari</li></ul>

<ul id="my_list2"><li>Lamborghini</li><li>Maserati</li></ul>

<button onclick="my_function('my_list1','my_list2')">Compare Lists</button>

<!-- html element to place output -->
<p id="my_output"></p>
// variables
let my_element = document.documentElement;
let my_answer = my_element.isDefaultNamespace('http://www.w3.org/1999/xhtml');

// function for comparison
function my_function(x,y) {
    var item_1 = document.getElementById(x).firstChild;
    var item_2 = document.getElementById(y).firstChild;
    var z = item_1.isEqualNode(item_2);

    document.getElementById('my_output').innerHTML = z;
}

Output

true

Syntax

element.isEqualNode(node)

// or

node.isEqualNode(node)

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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