How to Create An Image Zoom on Hover With JavaScript



JavaScript Image Zoom on Hover

Creating an image zoom is very easy if you know JavaScript. In this tutorial, I will show you how to create a JavaScript image zoom effect.

You will find many tutorials on this topic on the internet. But here I will tell you the easiest way to zoom an image by HTML CSS JavaScript bar. With this, you will know how to add image zoom in an image using JavaScript.

JavaScript Image Zoom on Hover 

Earlier I shared tutorials on creating many types of Image Zoom, Image Magnifier Glass, and Image Hover Effects.

There is no need to worry if you are a beginner. Here I have shown step by step how to make image zoom javascript. You can also create zoom effects using CSS only if you want. 

However, in that case, you will not be able to control the position of the zoom. In this case, the zoom effect will follow your mouse cursor. This means that the image of the place where your mouse will be zoomed.

See the Pen Vanilla image zoom by Shantanu Jana (@shantanu-jana) on CodePen.


For this, you need to have some knowledge about JavaScript. Here I have given all the source code. Because very little code has been used to create this Image Zoom on Hover.


HTML code of Image Zoom

A box containing the image has been created using the HTML below. Here you can change the image to your liking.


<div class="image">
<img src="https://images.unsplash.com/photo-1493441883526-0ed85220dc0c?w=2091&ixid=dW5zcGxhc2guY29tOzs7Ozs%3D" alt="Unsplash Image">
</div>

CSS code of Image Zoom

Now you have to design this Image Zoom on Hover using some CSS. First I designed the box. Here the width of the box: 600px, height: 400px is used. 

Here the size of the zoomed image is kept equal to the box. I have used a 5px border with it here.


body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.image {
  position: relative;
  width: 600px;
  height: 400px;
  overflow: hidden;
  border: 5px solid #fff;
  box-shadow: -1px 5px 15px #000;
}
.image:hover {
  --zoom: 3;
}
.image img {
  position: absolute;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  transform: scale(var(--zoom, 1));
  transform-origin: var(--x) var(--y);
  transition: transform 0.3s ease;
}

Image Zoom's JavaScript code

Above we have done the work of designing this JavaScript Image Zoom. Now is the time to activate it via JavaScript. Below are all the codes put together and with the necessary explanations. Hopefully, those explanations will help you understand this JavaScript code.


document.querySelectorAll('.image').forEach((elem) => {
  let x, y, width, height
//onmouseenter event occurs when the mouse pointer is moved onto an element
  elem.onmouseenter = () => {
//getBoundingClientRect() method returns the size of an element and its position relative to the viewport
    const size = elem.getBoundingClientRect()
x = size.x
y = size.y
width = size.width
height = size.height
  }
//onmousemove event occurs when the pointer is moving while it is over an element
  elem.onmousemove = (e) => {
    const horizontal = ((e.clientX - x) / width) * 100
    const vertical = ((e.clientY - y) / height) * 100
    elem.style.setProperty('--x', horizontal + '%')
    elem.style.setProperty('--y', vertical + '%')
  }

})

Image zoom is a common web element. You can use this Image Zoom JavaScript in different places. There is no substitute for this type of design to zoom in on an image. Comment on how you like this JavaScript Image Zoom.






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