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

Acronym DOM on wood planks
Code

A Friendly Introduction to the Document Object Model (DOM) API

The Document Object Model (DOM) is the browser’s in-memory representation of your HTML, letting JavaScript select elements (querySelector), listen to events (addEventListener), update content (textContent), toggle styles (classList), and create/insert nodes (createElement, insertAdjacentElement). With it, a button can change a box’s text, toggle a highlight class, set a data attribute, or insert a new paragraph right after the box—no page reload required—illustrating the simple flow: select, listen, update.

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