How To Change Styles and Classes In JavaScript DOM?

How To Change Styles and Classes In JavaScript DOM?

Greetings, code enthusiasts! As members of the codedamn community, we all share one common goal – the pursuit of knowledge. Today we'll be embarking on the exciting journey of learning how to manipulate Styles and Classes in JavaScript Document Object Model (DOM).

Understanding JavaScript DOM

Before we dive in, it's crucial to know what JavaScript DOM is. In simple terms, the Document Object Model (DOM) is an API that represents and interacts with any HTML or XML document. The DOM is a document structure represented as a tree that JavaScript can interact with.

Why Change Styles and Classes?

The real power of JavaScript lies in its ability to change both the content and the style of HTML. When it comes to making a website dynamic and interactive, changing styles and classes is a major player. It allows us to change the look and feel of the content, thereby making our sites more responsive and user-friendly.

Changing Styles in JavaScript DOM

Changing an HTML style using JavaScript is not as daunting as it might seem. We simply use the style property to achieve this. For instance, let's say we have a paragraph with an id of test:

<p id="test">Hello, codedamn!</p>

If we want to change the color of the text to blue, we would do this:

document.getElementById("test").style.color = "blue";

Here, getElementById is a method that fetches the element with the specified ID, and style.color is used to change the color of the text.

Changing Multiple Styles

In a similar fashion, you can change multiple styles at once. Let's change the color and the font-size of our text:

var para = document.getElementById("test"); = "blue"; = "20px";

Altering Classes in JavaScript DOM

We can also add, remove, and toggle classes in JavaScript. This is extremely useful when we want to apply multiple styles to an element at once.

Adding a Class

The classList.add() function allows us to add classes to an element. Let's add a class named 'highlight' to our paragraph.


Removing a Class

As you might have guessed, we can also remove a class using the classList.remove() function.


Toggling a Class

The classList.toggle() function is a little more complex. It removes a class from an element if the class exists. If it doesn't exist, it adds the class.



Q: Can I add multiple classes at once?

A: Yes, you can add multiple classes by passing them as separate arguments to the add function.

element.classList.add("class1", "class2", "class3");

Q: Can I change the style of multiple elements at once?

A: Yes, you can select multiple elements using getElementsByClassName or querySelectorAll and then loop through them to change the style.

Q: Is there a way to check if an element has a specific class?

A: Yes, the contains method checks if an element has a specific class.


For more in-depth information on JavaScript DOM, you can check out the official documentation.

In conclusion, understanding how to manipulate styles and classes in JavaScript DOM is essential for any web developer. It allows us to create more dynamic, interactive, and responsive websites. So keep experimenting and keep coding with codedamn!

Happy coding, and see you in the next post!

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