Working With Classes In JavaScript

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Working With Classes In JavaScript

Working with classes in JavaScript is a common task when manipulating the Document Object Model (DOM) and changing the styles of elements on a web page. There are several ways to work with classes in JavaScript, including the classList property, the className property, and the setAttribute() method.

Code For classList Property

The classList property is a read-only property that returns a live DOMTokenList of the class attributes of an element. This property allows you to add, remove, or toggle CSS classes on an element.

For example, to add a class called “highlight” to a div element with the ID of “myDiv”, you can use the following code:

document.getElementById("myDiv").classList.add("highlight");

You can also remove a class using the remove() method, and toggle it using the toggle() method.

document.getElementById("myDiv").classList.remove("highlight");
document.getElementById("myDiv").classList.toggle("highlight");

The className property is a string that contains all the classes of an element. This property allows you to set or get all the classes of an element as a string. For example, to get all the classes of a div element with the ID of “myDiv”, you can use the following code:

Code For className Property

var classes = document.getElementById("myDiv").className;
console.log(classes);

You can also set the class of an element using this property.

document.getElementById("myDiv").className = "new-class";

The setAttribute() method is a method that allows you to set or change the value of a specific attribute on an element.

For example, to add a class “highlight” to a div element with the ID of “myDiv”, you can use the following code:

Code For setAttribute Property

document.getElementById("myDiv").setAttribute("class", "highlight");

Another way of working with classes is by using a JavaScript library such as jQuery, it provides a convenient and easy-to-use API for manipulating the DOM and changing CSS classes. For example, to add a class “highlight” to a div element with the ID of “myDiv” using jQuery, you can use the following code:

$("#myDiv").addClass("highlight");

It also provides methods such as removeClass() and toggleClass() to remove or toggle a class.

Another way to work with classes is by using the classList.contains() method. This method allows you to check if an element has a specific class.

For example, to check if a div element with the ID of “myDiv” has a class called “highlight”, you can use the following code:

Code For .contains Property

var hasClass = document.getElementById("myDiv").classList.contains("highlight");
console.log(hasClass);

Another method is classList.replace(), which allows you to replace a class on an element with another class.

For example, to replace the class “old-class” with “new-class” on a div element with the ID of “myDiv”, you can use the following code:

Code For .replace Property

document.getElementById("myDiv").classList.replace("old-class", "new-class");

Additionally, we can also use the Element.matches() method to check if an element matches a specific CSS selector.

This method is useful for checking if an element has a specific class, as well as other selectors such as tag name or attribute values.

For example, to check if a div element with the ID of “myDiv” has a class called “highlight”, you can use the following code:

Code For .matches property

var isHighlight = document.getElementById("myDiv").matches(".highlight");
console.log(isHighlight);

Also, in modern browser, you can use Element.closest() method to find the closest ancestor that matches a specific CSS selector.

For example, to find the closest ancestor of a div element with the ID of “myDiv” that has a class called “container”, you can use the following code:

var closestContainer = document.getElementById("myDiv").closest(".container");
console.log(closestContainer);

Conclusion

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