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September 22, 2022 01:38
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GA custom event trigger which tracks reading behavior
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<script> | |
try { | |
document.addEventListener("DOMContentLoaded", function() { | |
var accumScrollMove = 0; | |
// Set it 1 msecs to avoid div by zero error | |
var accumScrollTime = 1; | |
var latestScrollTop = 0; | |
var latestScrollAt = new Date(); | |
function checkScroll() { | |
// 1. Check scrollbar movement speed | |
var scrollTop = document.body.scrollTop; | |
var scrollAt = new Date(); | |
var scrollTopDelta = Math.abs(latestScrollTop - scrollTop); | |
var scrollTimeDelta = Math.min(scrollAt - latestScrollAt, 5 * 60 * 1000); // limit max time-delta to 5 minutes | |
if(scrollTopDelta !== 0) { | |
latestScrollTop = scrollTop; | |
latestScrollAt = scrollAt; | |
accumScrollMove += scrollTopDelta; | |
accumScrollTime += scrollTimeDelta; | |
} | |
// 2. Check event firing condition | |
if(accumScrollTime > 30 * 1000 && scrollTop / document.body.scrollHeight > 0.8) { | |
var pixelPerSec = Math.floor(accumScrollMove / accumScrollTime * 1000); | |
var label = pixelPerSec > 100 ? 'skimmer' : 'reader'; | |
ga('send', 'event', 'read', 'pps', label, pixelPerSec); | |
} else { | |
window.setTimeout(checkScroll, 500); | |
} | |
} | |
checkScroll(); | |
}); | |
} catch(e) {} | |
</script> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<script> | |
try { | |
(function() { | |
var accumScrollMove = 0; | |
// Set it 1 msecs to avoid div by zero error | |
var accumScrollTime = 1; | |
var latestScrollTop = 0; | |
var latestScrollAt = new Date(); | |
function checkScroll() { | |
// 1. Check scrollbar movement speed | |
var scrollTop = document.body.scrollTop; | |
var scrollAt = new Date(); | |
var scrollTopDelta = Math.abs(latestScrollTop - scrollTop); | |
var scrollTimeDelta = Math.min(scrollAt - latestScrollAt, 5 * 60 * 1000); // limit max time-delta to 5 minutes | |
if(scrollTopDelta !== 0) { | |
latestScrollTop = scrollTop; | |
latestScrollAt = scrollAt; | |
accumScrollMove += scrollTopDelta; | |
accumScrollTime += scrollTimeDelta; | |
} | |
// 2. Check event firing condition | |
if(accumScrollTime > 30 * 1000 && scrollTop / document.body.scrollHeight > 0.8) { | |
var pixelPerSec = Math.floor(accumScrollMove / accumScrollTime * 1000); | |
var label = pixelPerSec > 100 ? 'skimmer' : 'reader'; | |
dataLayer.push({ 'event' : 'trackEvent', 'eventCategory' : 'read', 'eventAction' : 'pps', 'eventLabel' : label, 'eventValue': pixelPerSec }); | |
ga('send', 'event', 'read', 'pps', label, pixelPerSec); | |
} else { | |
window.setTimeout(checkScroll, 500); | |
} | |
} | |
checkScroll(); | |
}); | |
} catch(e) {} | |
</script> |
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