How to use .on and .hover in jQuery ?

Last Updated : 23 Apr, 2020

jQuery .on() method: This method is used to attach an event listener to an element. This method is equivalent to the addEventListener in vanilla JavaScript.

Syntax:

$(element).on(event, childSelector, data, function)

Parameter

event: It specifies the event to attach (click, submit, etc.).
childSelector: It is optional parameter and it specify the specific child to which given event handler can be used.
data: It specifies optional data to be passed along with function.
function: It specifies the function to be run while the attached event triggered.

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <!-- Adding jQuery Library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"> 
    </script> 
  
    <style> 
        /* Adding basic styling */ 
        div { 
            background-color: green; 
            width: 100px; 
            height: 100px; 
            color: #fff; 
            text-align: center; 
        } 
    </style> 
</head> 
  
<body> 
    <div>Normal</div> 
    <script> 
        $('div').on('click', function () { 
  
            // Changing the content 
            $(this).html('Clicked!'); 
        }); 
    </script> 
</body> 
  
</html> 

Output:

Before Clicking on div element:
After Clicking on div element:

jQuery .hover() method: This method is used to specify the styles of the element during mouseover and mouseout conditions. It takes two functions as an argument:

mouseoverFunction: Triggers when mouse enters the element.
mouseoutFunction: Triggers when mouse leaves the element.

You can specify multiple styles inside these functions.

Syntax:

$(element).hover(mouseoverFunction, mouseoutFunction)

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <!-- Adding jQuery Library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"> 
    </script> 
  
    <style> 
        /* Adding basic styling */ 
        div { 
            background-color: green; 
            width: 100px; 
            height: 100px; 
            color: #fff; 
            text-align: center; 
        } 
    </style> 
</head> 
  
<body> 
    <div>Normal</div> 
      
    <script> 
        $('div').hover(function () { // mouse-in  
            $(this).css("background-color", "blue"); 
            $(this).html('Hovered!'); 
        }, 
            function () { // mouse-out 
                $(this).css("background-color", "green"); 
                $(this).html('Normal'); 
            } 
        ) 
    </script> 
</body> 
  
</html> 