JSFiddle - React, Tailwind, and code Playground

by Danny Michaelis

HTML

<div class="container">
    <div class="wrap">
        <div class="page page1"></div>
        <div class="page page2"></div>
        <div class="page page3"></div>
        <div class="page page4"></div>
    </div>
</div>

CSS

.container, .page, .wrap {
    width: 300px;
    height: 400px;
}
.container {
    background: #efefef;
    box-shadow: 0px 0px 10px black;
    overflow: hidden;
    position: relative;
    margin: 5px auto;
}
.wrap {
    width: 1200px;
    position: absolute;
    top: 0;
    left: 0;
}
.page {
    float: left;
    display: block;
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -o-user-select: none;
}
.page1 {
    background: yellow;
}
.page2 {
    background: green;
}
.page3 {
    background: blue;
}
.page4 {
    background: red;
}

JavaScript

var mouseDown = false,
    right;
var xi, xf, leftX = 0;
var nPages = $(".page").size();
var pageSize = $(".page").width();
var threshold = pageSize / 2;
var currentPage = 0;

var mouseStart, wrapLeftPosition, mouseMoveDelta, movedRight;
$(".container").mousedown(function (clickEvent) {
    mouseStart = clickEvent.pageX;
    $(this).on("mousemove", function (moveEvent) {
        mouseMoveDelta = moveEvent.pageX - xi;
        $(".wrap").css({
            left: (leftX + mouseMoveDelta)
        });
        movedRight = (mouseMoveDelta < 0) ? true : false;
    });
}).on('mouseup mouseleave', (function (clickEvent) {
    $(this).off('mousemove');
    handleEndOfMovement(clickEvent.pageX);
});

function handleEndOfMovement(lastMousePosition) {
    wrapLeftPosition = $("wrap").position().left;
    mouseMoveDelta = lastMousePosition - mouseStart;
    if (mouseMoveDelta < -threshold || mouseMoveDelta > threshold) {
        setFocusedPage();
    } else {
        restore();
    }
}

function transitionPageMovement() {
    $(".wrap").stop().animate({
        "left": -(currentPage * pageSize)
    }, 200, function () {
        leftX = $("wrap").position().left;
    });

}

function restore() {
    transitionPageMovement()
}

function setFocusedPage() {
    if (leftX >= (-threshold)) { // First Page
        currentPage = 0;
    } else if (leftX < (-threshold) && leftX >= (-(nPages + 1) * threshold)) { // Second to N-1 Page
        (right) ? currentPage++ : currentPage--;
    } else if (leftX < -((nPages + 1) * threshold)) { // Third Page
        currentPage = nPages - 1;
    }
    transitionPageMovement();
}