How to detect scroll direction in vanilla JavaScript (to make a goofy logo animation)

1

Underscore.js

/* Source: https://underscorejs.org/underscore-esm.js During a given window of time. Normally, the throttled function will run As much as it can, without ever going more than once per `wait` duration; But if you'd like to disable the execution on the leading edge, pass `{leading: false}`. To disable execution on the trailing edge, ditto. */ Function throttle(func, wait, options) { var timeout, context, args, result; var previous = 0; if (!options) options = {}; var later = function () { previous = options.leading === false ? 0 : Date.now(); timeout = null; result = func.apply(context, args); if (!timeout) context = args = null; }; var throttled = function () { var _now = Date.now(); if (!previous && options.leading === false) previous = _now; var remaining = wait - (_now - previous); context = this; args = arguments; if (remaining <= 0 || remaining > wait) { if (timeout) { clearTimeout(timeout); timeout = null; } previous = _now; result = func.apply(context, args); if (!timeout) context = args = null; } else if (!timeout && options.trailing !== false) { timeout = setTimeout(later, remaining); } return result; }; throttled.cancel = function () { clearTimeout(timeout); previous = 0; timeout = context = args = null; }; return throttled; }.

#Development Tools #Javascript UI Libraries #JavaScript Framework 19 social mentions

2

Lo-Dash

Lodash and underscore are 2 popular utility libraries.

#Development Tools #Javascript UI Libraries #JavaScript Framework 85 social mentions

3

CodePen

See the Pen Detect scroll direction (throttling) by Rob (@robjoeol) on CodePen.

#Text Editors #Programming #Code Collaboration 484 social mentions