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nodeName vs tagName

Written byPhuoc Nguyen
16 Jun, 2020
`nodeName` and `tagName` are the properties to get the name of HTML node.
`tagName` is used to get the type of element nodes that have node type of 1. For other type of nodes such as attribute, comment, text, .etc, `nodeName` is used to get the name of node.
Let's take a look at the following example where we have a simple button:
<button id="login">Login</button>
The `nodeName` and `tagName` properties are the same for the HTML element:
const button = document.getElementById('login');
button.nodeType; // 1
button.nodeName; // 'BUTTON'
button.tagName; // 'BUTTON'
Let's access the node represents the `id` attribute:
const idNode = button.getAttributeNode('id');
idNode.nodeType; // 2
idNode.nodeName; // 'id'
idNode.tagName; // undefined
In a similar way, the button text node gives different result for `nodeName` and `tagName`:
const content = button.firstChild;
content.nodeType; // 3
content.nodeName; // '#text'
content.tagName; // undefined

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Phước Nguyễn