how to animate div box from left to right or right to left when scroll web page - jquery-animate

Question

i want to animate div box from left to righ and right to left.
suppose i have a 2 box with bootstrap classes`example :
<div class="container">
<div class="row">
<div class="col-md-6 id="leftToRight"></div>
<div class="col-md-6 id="RightToLeft"></div>
</div>
</div>
now i want to animate #leftToRight id from left to right and #RightToLeft from righ to left.
when scroll web page.
I see many website in which this type of animation is applied.
I am very curious to know how it is happen.

Answer 1

You can use the wheel event to answer your question:
$(function() {
$(window).on('wheel', function(e) {
var delta = e.originalEvent.deltaY;
if (delta > 0) //On scroll down
{
$('#RightToLeft').animate({
left: "-=10px"
},5);
$('#LeftToRight').animate({
left: "+=10px"
},5);
}
else //This is added for reverse animation on scroll up
{
$('#RightToLeft').animate({
left: "+=10px"
},5);
$('#LeftToRight').animate({
left: "-=10px"
},5);
}
return false; // this line is only added so the whole page won't scroll in the demo
});
});
#RightToLeft{
position: relative;
margin: auto;
background: red;
width: 100px;
height: 100px;
}
#LeftToRight{
position: relative;
margin: auto;
background: blue;
width: 100px;
height: 100px;
}
.row{
margin: auto;
width:90%;
overflow: hidden;
background: grey;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<div class="col-md-6" id="LeftToRight">Left to Right</div>
<div class="col-md-6" id="RightToLeft">Right to Left</div>
</div>
</div>