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

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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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