How to Accurately Measure the Original Dimensions of Resized Images in Different Browsers?

Unveiling the Original Dimensions of Client-Side Resized Images Across Browsers

Determining the true dimensions of an image that has been resized on the client side is a crucial task for many web development scenarios. Whether you're adjusting images for responsive layouts or displaying the original size to users, finding a reliable solution that works consistently across browsers is essential.

Option 1: Unleashing OffsetWidth and OffsetHeight

One approach involves removing the width and height attributes from the element and retrieving its offsetWidth and offsetHeight. This technique eliminates the possibility of CSS styles overriding the original dimensions.

<code class="javascript">const img = document.querySelector('img');
img.removeAttribute('width');
img.removeAttribute('height');
const width = img.offsetWidth;
const height = img.offsetHeight;</code>

Option 2: Harnessing JavaScript Image Objects

An alternative method utilizes JavaScript Image objects. Create an Image object, assign the image source to its src property, and directly access its width and height properties after the image has loaded.

<code class="javascript">const newImg = new Image();
newImg.onload = function() {
  const width = newImg.width;
  const height = newImg.height;
  // Display the dimensions in an alert for demonstration
  alert(`Original image size: ${width}px * ${height}px`);
};
newImg.src = imgSrc; // Important to set after attaching the onload handler</code>

Remember to acknowledge the importance of event handling. With large images, using the approach in Option 2 without the onload event may result in empty results because the image might not have loaded yet when the code execution runs.

By employing these browser-agnostic techniques, you can confidently determine the true dimensions of resized images, empowering your web applications with enhanced precision and flexibility.

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