Creating a spash screen kind of pop up when you reach the end of the page - Javascript
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How to detect if user has scrolled to the bottom of the page - Javascript, pop up

Scroll right down and press the "sneak peak" button to see the code.

The condition that has to be met for the pop up to show is: if ((window.innerHeight + window.pageYOffset)+1>= document.body.scrollHeight). Play with the window and resize it (in height and width) to get a feel for the values which are visible in the table. Resizing the window vertically will result in a different innerheight, resizing horizontally will affect the scrollHeight.

scrollHeight: innerHeight: pageYOffset + innerheight: pageYOffset:
Javascript event, onscroll, learn Javascript made easy, this is a symbol for the ease of understanding

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Sneak peek of the server side code