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Javascript – How to Identify a image is portrait or landscape image in react js?

how to dynamically identify whether an image is in portrait or landscape orientation using React.js. This guide explains the steps to analyze image dimensions and apply conditional styling to ensure your application adapts seamlessly to varying image formats.

I attempted to calculate the image’s width and height using React.js and conditionally applied styles based on the orientation (portrait or landscape). I expected the component to accurately detect the image orientation and dynamically adjust the styling to fit the layout requirements.

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  1. 0 
    <Image
  src={img.png}
  onLoad={(event) => {
    const imgElement = event.target as HTMLImageElement;
    const isPortrait = imgElement.naturalHeight > imgElement.naturalWidth;
    if (isPortrait) {
      imgElement.style.objectFit = 'cover'
    } else {
      imgElement.style.objectFit = 'contain'
    }
  }}
/>

    In an image element, you can use the onload property to check if the naturalHeight is greater than the naturalWidth. Based on this condition, you can dynamically change the style, ensuring the layout adapts appropriately.

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  2. 0

    Widths and heights

    Use JavaScript to query the width and height of an image, then compare the two values. If they are equal, it is a square; if the width is greater, it is landscape; if the height is greater, it is portrait.

    Detecting the original image manipulation

    An image can be rotated from its original orientation. This information can be read from the image’s EXIF metadata. For example, by using the exif-js library, you can extract the image’s metadata and determine from the "orientation" value whether the image is currently in a portrait or landscape orientation.

    Orientation values:

    • 1: No rotation.
    • 6: Rotated 90 degrees clockwise (a landscape image becomes portrait).
    • 8: Rotated 90 degrees counterclockwise (a landscape image becomes portrait, or a portrait image becomes landscape).
    • etc.; Source: Rotate photos to be upright (sirv.com)

    enter image description here

    For example, if an image’s width is greater than its height, we see it as a landscape image. However, if it is rotated 90 degrees clockwise or counterclockwise, it might originally have been a portrait image.

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