JSFiddle - React, Tailwind, and code Playground

HTML

<select class="theSelect">
  <option value="volvo" id="volvo">Volvo</option>
  <option value="saab" id="saab">Saab</option>
  <option value="opel" id="opel">Opel</option>
  <option value="audi" id="audi">Audi</option>
</select>

JavaScript

$('select.theSelect').on('change', function (e) {
    var optionSelected = $("option:selected", this);
    var valueSelected = this.value;
		if(valueSelected === "volvo"){
    	window.alert("volvo selected");
    }
    if(valueSelected === "saab"){
    	window.alert("saab selected");
    }
});