Modifying DOM Elements

Once we can grab DOM elements, we can modify them. There are several methods to change DOM elements. If we would like to set the attribute on an element…

let myElem = document.getElementById(‘elementId’); myElem.setAttribute(‘attributeName’,‘attributeValue’
); 

If we would like to add a class to an element…

let myElem = document.getElementById(‘elementId’); myElem.classList.add(‘className’); 

If we would like to change the style of an element…

let myElem = document.getElementById(‘elementId’); myElem.style.color = ‘#333’; 

Here we can use color names, RGB(a), hex codes and HSL(a).

We can even change the text content of an element…

let myElem = document.getElementById(‘elementId’); myElem.textContent = ‘Here is some new text!’; 

Happy Coding!

Clay Hess

More To Explore

Secure Login Access with Username and Password on Mobile Device and Laptop
Code

A gentle intro to the Credential Management API

The Credential Management API lets your site securely store and retrieve user credentials through the browser’s built‑in manager—no brittle autofill hacks required. In our demo, a successful login stores a PasswordCredential, and a single click later retrieves and auto-fills it for returning users. It’s a progressive enhancement: your form still works everywhere, but supported browsers deliver a faster, lower-friction sign-in. Pair it with proper autocomplete attributes today, and plan for WebAuthn/passkeys to level up tomorrow.

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