[javascript] How to load images dynamically (or lazily) when users scrolls them into view

Some of the answers here are for infinite page. What Salman is asking is lazy loading of images.

Plugin

Demo

EDIT: How do these plugins work?

This is a simplified explanation:

  1. Find window size and find the position of all images and their sizes
  2. If the image is not within the window size, replace it with a placeholder of same size
  3. When user scrolls down, and position of image < scroll + window height, the image is loaded

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