JSFiddle - React, Tailwind, and code Playground

HTML

<input id=firstname type=text>
<select id="name" name="name" multiselect> 
<option value="">Please select...</option> 
<option value="India">India</option> 
<option value="Us">Us</option> 
<option value="China">China</option> 
</select>

JavaScript

$(document).ready(function() {                                       
        $("#name").on("change", function() {
          $("#firstname").val($("#name").val());
        })
     });