javascript - Change class on scroll -

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i've been looking around online can't find problem im having (at least not limited js level)

i'm trying achieve effect change .class css when scrolls or swipes down page.

eg. <a> tages blue, if user scrolls 20px down or 50px down... <a> tags turn green , id scrolling stops. tags turn blue

you'll need bind scroll event, using window.onscroll: https://developer.mozilla.org/en-us/docs/web/api/window.onscroll function changes class on element you're interested in. 

// event "onscroll" on window object, we're binding , passing // anonymous function function executed when event triggered     window.onscroll = function (event) {       // here (inside anonymous function that's being passed in), add class       // "my-class" document body.       document.body.classlist.add("my-class");     }

note: should give enough information solve problem yourself, don't want solve - in example, function called every time window scrolled (so you'll want add sort of check/limit), , classlist doesn't work in older browsers.


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