JSFiddle - React, Tailwind, and code Playground

by userdude

HTML

<form id="myForm" action="#">
 Please select your rating * :
    <select id="myDropdown">
    <option value="">-Please Select-</option>
    <option value="1">One</option>
    <option value="2">Two</option>
    <option value="3">Three</option>
    <option value="4">Four</option>
    <option value="5">Five</option>
    </select>
    <input type="submit"/>
</form>

JavaScript

$(document).ready(function() {
    $('#myForm').submit(function(e){ // <<< This selector needs to point to your form.
        mydropdown = $('#myDropdown option:selected');
        if (mydropdown.length == 0 || $(mydropdown).val() == "") {
            alert("Please select anyone"); 
            e.preventDefault();
            return false;
        }
    });
});