up down tr in table with js

<!DOCTYPE html>
<html>
<head>
    <title>UP DOWN TR IN TABLE WITH JS | par NGLESSON</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="keyword" content="UP DOWN TR IN TABLE WITH JS">
    <meta name="author" content="Mezgani said">
    <meta name="copyright" content="NGLESSON">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
    <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
    <link href="style.css" rel="stylesheet" />
</head>
<body class="container-fluid mt-5">
<h2 class="text-center text-info">Change position of tr in table with JS</h2>
<div class="table-responsive pt-3">
<table id="table" class="table table-hover">
        <thead>
            <tr>
                <th>ID</th>
                <th>NAME</th>
                <th>JOB</th>
                <th>Country</th>
                <th>UP / DOWN</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>1</td>
                <td>Mezgani said</td>
                <td>Developer full-stack</td>
                <td>Maroc</td>
                <td>
					<a onclick="upNdown('up');"><i class="fa fa-caret-square-o-up" aria-hidden="true"></i></a>
					<a onclick="upNdown('down');"><i class="fa fa-caret-square-o-down" aria-hidden="true"></i></a>				
				</td>
            </tr>
            <tr>
                <td>2</td>
                <td>Saadia sadqi</td>
                <td>Employe</td>
                <td>France</td>
                <td>
					<a onclick="upNdown('up');"><i class="fa fa-caret-square-o-up" aria-hidden="true"></i></a>
					<a onclick="upNdown('down');"><i class="fa fa-caret-square-o-down" aria-hidden="true"></i></a>				
				</td>
            </tr>
            <tr>
                <td>3</td>
                <td>Idrissi Rachida</td>
                <td>RH</td>
                <td>Qatar</td>
                <td>
					<a onclick="upNdown('up');"><i class="fa fa-caret-square-o-up" aria-hidden="true"></i></a>
					<a onclick="upNdown('down');"><i class="fa fa-caret-square-o-down" aria-hidden="true"></i></a>				
				</td>
            </tr>
            <tr>
                <td>4</td>
                <td>Mohssini Oumaima</td>
                <td>Administrator</td>
                <td>Maroc</td>
                <td>
					<a onclick="upNdown('up');"><i class="fa fa-caret-square-o-up" aria-hidden="true"></i></a>
					<a onclick="upNdown('down');"><i class="fa fa-caret-square-o-down" aria-hidden="true"></i></a>				
				</td>
            </tr>
            <tr>
                <td>5</td>
                <td>Farihi Houda</td>
                <td>Graphic</td>
                <td>Canada</td>
                <td>
					<a onclick="upNdown('up');"><i class="fa fa-caret-square-o-up" aria-hidden="true"></i></a>
					<a onclick="upNdown('down');"><i class="fa fa-caret-square-o-down" aria-hidden="true"></i></a>				
				</td>
            </tr>
    </table>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
<script type="text/javascript" src="script.js"></script>
</body>
</html>
@charset "utf-8";
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100&display=swap');

* {
    margin:0px;
    padding:0px;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

thead{
    background: orange;
    color: #FFF;
    font-weight: bold;
}

tr{cursor: pointer}
    
.selected{
    background-color: #dee2e6; 
    font-weight: bold;
}

a{
    margin-top:10px;
    font-weight: bold;
    font-size: 25px;
    cursor: pointer;
}
var index;  // variable to set the selected row index
function getSelectedRow()
{
    var table = document.getElementById("table");
    for(var i = 1; i < table.rows.length; i++)
    {
        table.rows[i].onclick = function()
        {
            // clear the selected from the previous selected row
            // the first time index is undefined
            if(typeof index !== "undefined"){
                table.rows[index].classList.toggle("selected");
            }
           
            index = this.rowIndex;
            this.classList.toggle("selected");

        };
    }
        
}


getSelectedRow();


function upNdown(direction)
{
    var rows = document.getElementById("table").rows,
        parent = rows[index].parentNode;
     if(direction === "up")
     {
         if(index > 1){
            parent.insertBefore(rows[index],rows[index - 1]);
            // when the row go up the index will be equal to index - 1
            index--;
        }
     }
     
     if(direction === "down")
     {
         if(index < rows.length -1){
            parent.insertBefore(rows[index + 1],rows[index]);
            // when the row go down the index will be equal to index + 1
            index++;
        }
     }
}
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