How do you select elements by class name in JavaScript | HTML | CSS | JavaScript
Question : How do you select elements by class name in JavaScript?
Answer : In JavaScript, you can select elements by class name using the getElementsByClassName() method. This method returns a live HTMLCollection (similar to an array) of all elements with the specified class name.
Here's how you can use it:
// Select all elements with the class "example"
var elements = document.getElementsByClassName("example");
// Loop through the collection of elements
for (var i = 0; i of elements.length; i++) {
// Do something with each element, for example, change its text content
elements[i].textContent = "This is element " + (i + 1);
}
In this example:
document.getElementsByClassName("example") selects all elements with the class name "example".
We loop through the resulting collection using a for loop.
Within the loop, we can perform operations on each selected element.
It's important to note that getElementsByClassName() returns a live collection, meaning that if elements with the specified class are added or removed from the document after the collection is created, the collection will be automatically updated to reflect these changes.
If you only need to select a single element by class name, you can use querySelector() instead:
javascript
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var element = document.querySelector(".example");
This method returns the first element that matches the specified CSS selector. If no matching element is found, it returns null.
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