HTML-Files/List.html at master · jaibhageria/HTML-Files · GitHub

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<!--Swap two different lists elements dynamically-->
<html>
<head>
  <title>List Swap</title>

</head>
<body>
  <div>
    <input type="button" onclick="fun1()" value="InsertBefore" />
    <input type="button" onclick="fun2()" value="Swap" />
  </div>
  <h3>List 1</h3>
<ul>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
</ul>
<h3>List 2</h3>
<ul id="List2">
  <li>5</li>
  <li>6</li>
  <li>7</li>
  <li>8</li>
</ul>
<script>

  function fun1(){
    var el = document.querySelectorAll("li");
    var val = prompt("Enter element before which you want to insert")
    for(i in el){
      if(el[i].innerHTML == val){
        var newEl = document.createElement("li");
        newEl.innerHTML = "New Text";
        document.querySelector("ul#List2").insertBefore(newEl,el[i]);
      }

    }
  }

</script>
</body>
</html>