#scroll direction

A tiny jQuery plugin that detects scroll direction (up & down) and scroll position and adds CSS classes to specific indicator elements accordingly.

Demo

Download

document window has a “wheel” event. Nothing beats the practice of exploring the browser console to see what information is readily available. 

console logging the wheel event returns a lot of useful info, including direction via deltaY. This number either increases positively or decreases negatively.  

The code:

Add event listener (do something special for Internet Explorer because it’s special)

if(window.addEventListener){  addEventListener('wheel', whichDirection, false); } else if (window.attachEvent) { // ie  attachEvent('wheel', whichDirection, false); }

Create function (naming the parameter ‘event’ is good practice offering clarity)

function whichDirection(event){  console.log(event + ' WheelEvent has all kinds of good stuff to work with');  var scrollDirection = event.deltaY;  if(scrollDirection === 1){    console.log('meet me at the club, going down’, scrollDirection);  } else if(scrollDirection === -1) {    console.log('Going up, on a tuesday’, scrollDirection);  } }

Using jQuery (the function remains the same)

$(window).on('wheel', function(){  whichDirection(event); });

Throttle / Debounce:

Watch this in the console, you’ll see the WheelEvent firing over and over. Check out David Walsh’s article on creating a Debounce Function. You’ll be up and running with some hotness in short order. 

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