JSFiddle - React, Tailwind, and code Playground
HTML
<form action="" method="get">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<select name="Location" required="required">
<option value="">..</option>
<option value="india">india</option>
<option value="USA">USA</option>
</select>
<input type="submit">
</form>JavaScript
$('select').on('change', function() {
$('form').attr('action', 'city/' + $(this).val() + '/mobile.php');
});