verlok/vanilla-lazyload 15.2.0

Version 15.2

on GitHub

15.2.0

OPTIMIZE FOR SLOW CONNECTIONS WITH cancel_on_exit

Want to optimize speed for users who scroll down fast on a slow connection? Just set cancel_on_exit: true and LazyLoad will cancel the download of images exiting the viewport while still loading, eventually restoring the original attributes.

• Introduced the new cancel_on_exit option.
• Introduced the callback_cancel option, just in case you want to perform any additional action whenever a download gets canceled by cancel_on_exit.
• Created a new demo named cancel_on_exit.html so you can try the new cancel_on_exit option live.
• Set cancel_on_exit to true in the following demos, so you can test how it behaves...
  • image_ph_inline.html, with an inline SVG placeholder
  • image_ph_external.html, with an external SVG placeholder
  • delay_test.html, in conjuction with the delay_load option
  • fade_in.html, with a beautiful fade-in effect.

The cancel_on_exit option applies only to images so to the img (and picture) tags. It doesn't work for background images, iframes nor videos.

The cancel_on_exit option will probably default to true starting from the next major version, so give it a try! And please report your feedback in the comments of #438.

API

• Added the resetElementStatus() method for when you need to tell LazyLoad to consider an image (or other DOM element) again. This is particularly useful if you change the data-src attribute after the previous data-src was loaded). See the API section in the README file for more information.

FIX

• The callback_exit callback was called several times (for every images out of the viewport) at instance creation or upon update() calls. Now the callback is properly called only when any element exits the viewport.

INTERNALS

• Improved script performance by reducing the number of event listeners used for loading elements.
• Changed the values that the (internally used) data-ll-status attribute can take. Removed the status "observed" (it was useless) and introduced status "delayed".

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