jquery/task11.html at master · codeforwebdevelopment/jquery · GitHub

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<!Doctype html>
<html>
<head>
<style>
li {
    border: 1px solid #999;
    height: 2em;
    width: 2em;
}

li.selected {
    background: green;
}
ul {
    list-style: none outside;
    padding: 0;
}
</style>
<script src="jquery-3.1.1.min.js"></script>

<script>
$(function () { // same as (document).ready(function () {..})
  var slides = $("#slides li"); // find the slides once

  // common next/prev function
  function changeSlide(direction) {
    var target,
        current = slides.filter(".selected"); // find the current slide
    target = current[direction](); // call either .next() or .prev()
    if(target.length) { // if there is a next/prev slide...
      current.removeClass();
      target.addClass("selected");
    }
  }
    $(".next").on("click", function () { changeSlide('next') });
  $(".prev").on("click", function () { changeSlide('prev') });
});
  </script>

<title>
</title>
</head>
<body>
<ul id="slides">
    <li class="selected"></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
</ul>
<button class="prev">Prev</button>
<button class="next">Next</button>
</body>
</html>