javascript - Moving image while scroll down and up on path -


i design ball (images) on website when scrolling down or up, ball gonna stick on path while scrolling.

screenshot:

enter image description here

but don't know how stick ball on path.

i tried 

if (s > 40 && s <= 60) {             if(scrollposition == 0){                 position += 2;             }             if(scrollposition == 1){                 position -= 2;             }         } else if (s > 60 && s <= 80) {             if(scrollposition == 0){                 position -= 2;             }             if(scrollposition == 1){                 position += 2;             }

but weird.. here code https://codepen.io/ookangzheng/pen/eeyqjj?editors=0011

thanks

i have tried few way solve problem. first of all, think hard use s element in coding guide frequency of increase position because seen different every scrolling.

my suggestion here. try use whole height , window height calculate percentage , use it. also, not going use point changing position because scrolling duration large. not necessary point small.

fyi, have added transition-duration: 1s; , transition-property: all; in css made smooth movement.

percentage coding

    var s = $(this).scrolltop();         d = $(document).height(),         c = $(this).height();     var length = d - c;     var pctscrolled = math.floor(s / length * 100) ;

calculate position

    if( s < 33){         position = 60;     }     if(s > 33 && s < 66){         position = 40;     }     if(s > 66 && s < 100){         position = 60;     }     if(s == 100 || s == 0 ){ //initial position on top , bottom          position = 50;     }

hope find way!


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