jQuery hasClass() Method

Syntax

Certainly, here's the syntax for the hasClass() method in jQuery.

The $() function in jQuery is a versatile selector used to manipulate DOM elements using various selection criteria. It grants access to the jQuery library and returns a jQuery object representing selected element(s). With this object, the hasClass() method can be employed to determine if the chosen element(s) possess a particular CSS class. The method takes a class name as a string input, devoid of a preceding dot, and evaluates whether the class is present among the element's classes.

Return Value: Boolean

The hasClass() method returns a boolean value (true or false) based on whether the selected element(s) have the specified class.

If any of the selected elements have the class we're checking for, the method returns true. If none of the selected elements have the class, the method returns false.

Parameters

The hasClass() method takes a single parameter, which is the name of the CSS class we want to check for on the selected element(s). Here's a more detailed breakdown of the parameters.

• className (required)

  The className parameter is a string value that should match the name of the CSS class exactly. It's important to note that you provide the class name without a leading dot (.). The method will then check whether the selected element(s) have this class applied.

Here's an example of how the hasClass() method is used with its parameter.

Suppose we have an HTML element like this

We can use the hasClass() method to check if the element has the class "highlight" using the following code.

Explanation:

The $("#myElement") selector targets the element with the ID "myElement". The hasClass("highlight") method checks if the element has the class "highlight". Depending on the result, the appropriate message will be logged to the console.

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Examples

Here are some basic examples of using the hasClass() method in jQuery with simple code snippets and their expected outputs.

Example 1: Check if an Element has a Class

Code:

Output:

Explanation:

The above code demonstrates how to use jQuery's hasClass() method to determine if a specific HTML element has a particular CSS class. It creates a <div> element with the class "highlight" and then uses jQuery to check if it contains the class. The script logs a message confirming whether the element has the "highlight" class. In this case, since the class is applied, the output indicates that the element indeed has the 'highlight' class.

Example 2: Toggle Class on Button Click

Output:

Before:

After:

Similar to the previous jQuery example, when the "Toggle Active" button is clicked, the paragraph's font weight changes to bold and its color to green. Clicking the button again removes these styles.

Explanation:

The code showcases how to replicate the behavior of jQuery's toggleClass() using pure JavaScript. A button labeled "Toggle Active" and some paragraphs are present in the HTML. When the button is clicked, the active class is alternated on the paragraphs. JavaScript's addEventListener() is used to attach a click event to the button. Upon clicking, the script iterates through the paragraphs and toggles the active class using classList.toggle(), leading to the toggling of font weight and color styles. This provides a similar outcome to jQuery's class toggling.