How to make autocomplete list scroll and selected by arrow keys

PHP
1

here is my html code

<div class="col-sm-9">
this input field i'm type city name show related city in list <ul>
     <input class=" form-control" type="text" id="country_id"onkeyup="autocomplet()">

this display result

    <ul style=" background:#eee;" id="reviews_data"></ul>
 </div>

php code

if (isset($_POST['sendcity'])) {

        $select="select * from $cities where city_name LIKE '%".$_POST['cityname']."%'";
        $result= $wpdb->get_results($select); 
       foreach($result as $row){  
           ?> <li>  <?php echo $row->city_name ?></li>
       <?php }

     }

i want to make displing list scroll able and each selected text with scrool of arrow keys

2

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