How can I establish a backup plan for an image with transparency?

Question

How can I establish a backup plan for an image with transparency?

I currently have a dilemma with using a 20px fallback image for loading images. Transparent images seem to appear blurry once they are loaded due to the background image. The use of dominant color or traced SVG does not solve this issue either. How can I implement a fallback image without encountering these side effects?

One suggestion is to eliminate the background when transparent images are loaded. But would that be an effective solution?

An alternative approach could be to only remove the background for transparent images. Is there a way to identify whether an image is transparent using Node JS? This way, I can apply changes specifically to those images.

While I am utilizing Gatsby JS and gatsby-remark-relative-images plugin for image optimization automation, it is not mandatory to provide solutions solely based on Gatsby APIs.

javascript css image background background-image

Answer 1

Answer №1

If you're working with JavaScript, one useful event listener to keep in mind is the load listener. One approach you could take is to have a separate event listener for each 'img' element that removes the fallback image once the actual image loads.

document.querySelectorAll('.loaded-img').forEach(elm => {
   elm.addEventListener('load', (event) => {
      event.target.previousElementSibling.remove() // It's not usually recommended practice, but it works
      // If the fallback img isn't directly before the actual img, consider using something like 
      // event.target.parentElement.querySelector('.fallback-img').remove()
      // Another option is to apply a forward animation to transition opacity from 0 to 1
   }, { once:true }) // This ensures the listener only runs once per image load
})

Alternatively, you can attach an event listener to the parent element like so:

document.querySelector('.img-parent').addEventListener('load', (event) => {
   if (event.target.classList == 'image-class') // ... Same logic as above
})

Answer 2

If you're working with JavaScript, one useful event listener to keep in mind is the load listener. One approach you could take is to have a separate event listener for each 'img' element that removes the fallback image once the actual image loads.

document.querySelectorAll('.loaded-img').forEach(elm => {
   elm.addEventListener('load', (event) => {
      event.target.previousElementSibling.remove() // It's not usually recommended practice, but it works
      // If the fallback img isn't directly before the actual img, consider using something like 
      // event.target.parentElement.querySelector('.fallback-img').remove()
      // Another option is to apply a forward animation to transition opacity from 0 to 1
   }, { once:true }) // This ensures the listener only runs once per image load
})

Alternatively, you can attach an event listener to the parent element like so:

document.querySelector('.img-parent').addEventListener('load', (event) => {
   if (event.target.classList == 'image-class') // ... Same logic as above
})

How can I establish a backup plan for an image with transparency?

Answer №1

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