javascript - Making sticky div up to a point -

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i'm trying make div start being fixed when gets div, , stop being sticky when hits div, stay in position left. position of div sticky div should stop can anywhere depending on article lenght. can work on 1 resolution, not on others.

surprisingly, getting fixed works of time, "stop being fixed" part doesn't work (my div messes in height).

here code:

$(document).scroll(function() {    var topoflastdiv = ($("#scroll_to").position().top)-630;    var topoffirstdiv = ($("#tour_user_info").position().top)+20;    var topoflastdivsocial = topoflastdiv+100;    var y = $(document).scrolltop(),        header = $("#tour_price_map");        social_media = $('#social_media_sticky');     if (y < topoffirstdiv) {        header.css({position: "relative", "top" : "0px", "transform": "translatex(0)"});        header.fadein(100);        social_media.fadeout(100);    }    if(y >= topoffirstdiv && y<topoflastdiv)  {        social_media.fadein(100);        header.css({position: "fixed", "top" : "50px", "transform": "translatex(216.2%)"});    }    if (y >= topoflastdiv && y < topoflastdivsocial) {        header.css({position: "relative", "top" : topoflastdiv-520, "transform": "translatex(0)"});    }    if (y>= topoflastdivsocial) {        social_media.fadeout(100);        header.css({position: "relative", "top" : topoflastdiv-520, "transform": "translatex(0)"});    } });

the random numbers in code me trying make fit on laptops resolution works great then.

what missing here?

i fixed using "absolute" instead of "relative" in last 2 if clauses , adjusted "top" , "transform" accordingly.


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