JSFiddle - React, Tailwind, and code Playground
HTML
<select class="form-control" id="dropdownRequete">
<option selected disabled value="-1">REQUETE ENREGISTREE</option>
<option value="requete 1">requete 1</option>
<option value="requete 2">requete 2</option>
<option value="requete 3">requete 3</option>
<option value="requete 4">requete 4</option>
<option value="requete 5">requete 5</option>
</select>
JavaScript
$( function(){
$( "#dropdownRequete" ).on('change', function() {
alert( $(this).val() );
})
})