JavaScript mouse enter event - Change background color

Last update on July 10 2025 12:49:25 (UTC/GMT +8 hours)

JavaScript Event Handling: Exercise-3 with Solution

Mouse Enter Background Change

Write a JavaScript function that changes the background color of an element when a mouse enters it.

Sample Solution:

HTML and JavaScript Code:

 <!DOCTYPE html>
<html>
<head>
  <style>
    .my-element {
      width: 200px;
      height: 200px;
      background-color: lightgray;
    }
  </style>
</head>
<body>
  <div id="myDiv" class="my-element"></div>

  <script>
    function changeBackgroundColor(elementId, color) {
      const element = document.getElementById(elementId);
      if (element) {
        element.addEventListener('mouseenter', () => {
          element.style.backgroundColor = color;
        });
      }
    }

    // Call the function with element ID and desired color
    changeBackgroundColor('myDiv', 'green');
  </script>
</body>
</html>

Output:

JavaScript mouse enter event - Change background color.

Note: Executed on JS Bin

Explanation:

In the above exercise -

The "changeBackgroundColor()" function takes two parameters: elementId and color. The elementId is the ID of the element you want to target, and color is the desired background color.
Inside the function, it first retrieves the element using document.getElementById() and assigns it to the element variable.
Event listeners are added to the element using addEventListener(). The event being listened to is 'mouseenter', which triggers when the mouse enters the element.
When the 'mouseenter' event is triggered, the callback function sets the backgroundColor CSS property of the element to the specified color value.

Flowchart:

Live Demo:

See the Pen javascript-event-handling-exercise-3 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript program that gradually changes an element's background color on mouse enter using a timer.
Write a JavaScript function that alters an element's background based on the mouse's position within the element.
Write a JavaScript program that reverts the background color after a delay once the mouse leaves the element.
Write a JavaScript function that applies different background colors to multiple elements when hovered simultaneously.

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