How to Get the Image Size (Height & Width) Using Javascript

How to Get the Image Size (Height & Width) Using JavaScript

As a web developer, you may often come across situations where you need to retrieve the dimensions (height and width) of an image using JavaScript. Whether you want to dynamically adjust the layout of your webpage or perform some calculations based on the image size, JavaScript provides several methods to achieve this. In this blog post, we will explore three different approaches to get the image size using JavaScript.

1. Using the naturalWidth and naturalHeight properties

The simplest way to get the image size is by using the naturalWidth and naturalHeight properties of the Image object. These properties return the original dimensions of the image, regardless of any CSS styles applied to it.

const img = new Image();
img.src = 'path/to/image.jpg';

img.onload = function() {
  const width = img.naturalWidth;
  const height = img.naturalHeight;
  
  console.log('Width:', width);
  console.log('Height:', height);
};

By setting the src attribute of the Image object to the path of the image file, we can load the image and access its dimensions once it is fully loaded. The onload event ensures that the image is loaded before retrieving its size.

2. Using the offsetWidth and offsetHeight properties

If you want to get the displayed dimensions of an image, taking into account any CSS styles applied to it, you can use the offsetWidth and offsetHeight properties. These properties return the width and height of the image element, including any padding, border, or scrollbars.

const imgElement = document.getElementById('myImage');

const width = imgElement.offsetWidth;
const height = imgElement.offsetHeight;

console.log('Width:', width);
console.log('Height:', height);

In this example, we assume that the image element has an id attribute set to myImage. By accessing the element using document.getElementById, we can directly retrieve its displayed dimensions.

3. Using the getBoundingClientRect() method

The getBoundingClientRect() method provides a way to get the dimensions of an element, including its position relative to the viewport. By applying this method to an image element, we can obtain its width and height.

const imgElement = document.getElementById('myImage');

const rect = imgElement.getBoundingClientRect();
const width = rect.width;
const height = rect.height;

console.log('Width:', width);
console.log('Height:', height);

Similar to the previous example, we assume that the image element has an id attribute set to myImage. The getBoundingClientRect() method returns a DOMRect object containing the dimensions and position information of the element.

These three approaches provide different ways to get the image size using JavaScript. Choose the method that best suits your requirements and integrate it into your web development projects.

Happy coding!