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Selecting Elements
In this lesson, you'll learn about selecting elements in the DOM using JavaScript, which is a fundamental skill for manipulating and interacting with web pages.
Selecting Elements
One of the key tasks in JavaScript is to modify or manipulate existing elements on a web page. To do this, you first need to select the elements you want to work with. There are several methods to select elements in the DOM.
1. Finding Elements by ID
The easiest and most efficient way to find an element is by its ID. Each element on a web page should have a unique ID, similar to how each student in a college has a unique enrollment ID.
<div id="element-below-input"></div>
<script>
var element = document.getElementById("element-below-input");
</script>2. Finding Elements by Tag Name
If you want to manipulate all elements of a particular type, you can select them by their tag name. For example, to manipulate all images on a webpage:
<img src="image1path" alt="image1">
<img src="image2path" alt="image2">
<script>
var images = document.getElementsByTagName("img");
</script>3. Finding Elements by Class Name
Class names are often used to style elements uniquely. You can select elements by their class name to manipulate them. For example, if all links on a website have the class :
<a class="our-link" href="link1">Link1</a>
<a class="our-link" href="link2">Link2</a>
<script>
var links = document.getElementsByClassName("our-link");
</script>4. Finding Elements by CSS Selectors
CSS selectors allow you to use any combination of class, ID, tag name, and more to select elements. This method is very flexible and powerful.
For example, to select all span elements with the class :
<a class="link" href="link1">Link1</a>
<a class="link" href="link2">Link2</a>
<span class="link">Made to look like link</span>
<span class="link">Also Made to look like link</span>
<script>
var dummylinks = document.querySelectorAll("span.link");
</script>In this example, selects all span elements with the class .
Understanding how to select elements is crucial for DOM manipulation, enabling you to create dynamic and interactive web pages by modifying the structure and content of HTML documents.
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