JSFiddle - React, Tailwind, and code Playground

HTML

<select id="g_contracts">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>g

JavaScript

$(document).ready( function() {
        $("#g_contracts").trigger("change");

        $("#g_contracts").on("change", function() {
             alert(44);
        });
    });