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Selecting elements using javascript

In JavaScript, you can Select Elements from the HTML document using various methods provided by the Document Object Model (DOM).

Here are some common ways to select elements :

The Document Object Model (DOM) is a programming interface provided by web browsers that represents the HTML document as a tree-like structure. JavaScript interacts with the DOM to access and manipulate elements in the document.

By selecting elements, you gain the ability to dynamically modify their content, style, attributes, or perform other actions based on user interactions or program logic.

JavaScript provides several methods for element selection, such as:


Selecting by ID

If an element has a unique identifier, you can select it using the getElementById() method. It returns a single element matching the specified ID. For example : <div id="ElementId"> <p>hello world</p></div>


const element = document.getElementById('ElementId');

Selecting by class name

If multiple elements share the same class name, you can select them using the getElementsByClassName() method. It returns a collection of elements. For example <div class="test"> <p>hello world</p></div>


const elements = document.getElementsByClassName('test');

Selecting by tag name

You can select elements based on their HTML tag name using the getElementsByTagName() method. It also returns a collection of elements. For example <p>Tag name example</p>


const elements = document.getElementsByTagName('p');

Selecting by CSS selector

The querySelector() and querySelectorAll() methods allow you to select elements using CSS selectors. querySelector() returns the first element matching the selector, while querySelectorAll() returns a collection of all matching elements.


const element = document.querySelector('selector');
const elements = document.querySelectorAll('selector');

Selecting nested elements

If you want to select elements within a specific element, you can use the querySelector() or querySelectorAll() method on that element itself.


const parentElement = document.getElementById('parentId');
const elements = parentElement.querySelectorAll('selector');

Once you have selected an element or a collection of elements, you can interact with them using JavaScript to modify their properties, add or remove classes, change their content, attach event listeners, and more.


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