How To Make Jquery Function

jQuery is a popular JavaScript library that makes it easy to create interactive web applications with minimal code. One of the core features of jQuery is its support for creating custom functions, sometimes referred to as plugins. In this blog post, we’ll learn how to make a simple jQuery function that can be reused in multiple projects. But first, let’s briefly discuss what jQuery functions are.

What are jQuery Functions?

A jQuery function is a reusable piece of code that can be called using the jQuery syntax. These functions are useful for performing common tasks in your web application, such as manipulating the DOM or handling user events. You can create your own custom functions or use built-in jQuery functions like fadeIn(), slideUp(), and ajax().

Creating a Custom jQuery Function

To create a custom jQuery function, you need to extend the jQuery prototype with your function. Let’s create a simple function called highlight that adds a yellow background color to the selected elements:

(function($) {
$.fn.highlight = function() {
return this.each(function() {
$(this).css(‘backgroundColor’, ‘yellow’);

In the code above, we first create an immediately invoked function expression (IIFE) that receives jQuery as an argument. This ensures that our plugin is encapsulated and won’t interfere with other libraries or variables. Next, we extend the $.fn object, which is an alias for the jQuery prototype. Then, we create a new function called highlight that iterates over the selected elements using the .each() method and sets their background color to yellow.

Using the Custom jQuery Function

To use our custom highlight function, simply include the jQuery library in your HTML file, followed by the plugin script. Then, use the function on any elements you wish to highlight:

In the example above, we include the jQuery library and our custom highlight plugin. Then, we use the $(document).ready() method to ensure that the DOM is fully loaded before applying the highlight function. Finally, we call the highlight() function on all paragraph elements.


Creating custom jQuery functions is a great way to simplify your code and make it more reusable. By extending the jQuery prototype, you can create powerful plugins that can be easily shared and used across different projects. Give it a try and see how it can improve your web development workflow!