Selecting DOM Elements

There are several ways to grab DOM elements using the document object. We can use the id…

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

This will grab the DOM element that has the ID we pass to the getElementById function and stores it in the variable.

We can get elements by the class name…

let myElem = document.getElementsByClassName(‘elementClassName’); 

This will grab all the elements with the class name passed to the getElementsByClassName method. It will return them as an array and store them in the variable. This is the largest difference between grabbing DOM elements by ID versus class. Grabbing them by ID only returns the one element because there can (should) only be one element with that ID on the page. The can be multiple elements with the class name though.

We can also grab by tag name…

let myElem = document.getElementsByTagName(‘p’); 

In this example, we are getting all of the paragraph elements on the page and storing them as an array in the variable.

We can also utilize css selectors with two additional methods…querySelector and querySelectorAll…

let myElem = document.querySelector(‘elementId’); 

In this example, we can grab any element by a css selector. I have the ID in the method, but we can pass a class, a tag or a combination of those. For example, if we would like a paragraph tag with the ID of intro…

let myElem = document.querySelector(‘p#intro’); 

We can also grab several elements…

let myElem = document.querySelectorAll(‘css selector’); 

Again, we can use css selectors. This difference here is we can grab several elements and they return as an array. For example, if we wish to grab all images that have a class of gallery…

let myElem = document.querySelectorAll(‘’); 

Happy Coding!

Clay Hess

More To Explore

computer, laptop, work place-2982270.jpg

Unlocking Wireless Communication: A Dive into the Bluetooth API

Wireless communication has become an integral part of our daily lives, and Bluetooth technology is at the forefront of this revolution, enabling devices to exchange data over short distances and creating a world more interconnected than ever before. At the heart of this technology lies the Bluetooth Application Programming Interface (API), a powerful tool for developers looking to harness the capabilities of Bluetooth in their applications. In this blog post, we’ll explore what the Bluetooth API is, how it works, and the possibilities it opens up for innovation in wireless communication.

lighthouse, beacon, atlantic-8578318.jpg

Understanding the Beacon API: Simplifying Asynchronous Data Transfers

In today’s data-driven world, web applications often need to send data back to the server. Traditionally, this has been done using AJAX requests or similar methods. However, these techniques can come with a cost, especially when dealing with data that needs to be sent during the unload phase of a document, such as tracking and diagnostic data. This is where the Beacon API shines by allowing developers to send data to a server more reliably and efficiently.

Share This Post


Need help?

Let's have a chat...


Jump Back In!

Here at Webolution Designs, we love to learn. This includes sharing things we have learned with you. 


Begin Your Learning Journey Today!

Come back inside to continue your learning journey.