JSFiddle - React, Tailwind, and code Playground

HTML

<form id="CarSearch" action="" method="post">
 <select name="style" id="Style">
 <option value="" selected>Any Style</option>
 <option value="style/sports-1">Sports</option>
 <option value="style/wagon-3">Wagon</option>
 <option value="style/suv-6">SUV</option>
 </select>

 <select name="make" id="Make">
 <option value="" selected>Any Make</option>
 <option value="make/porsche-3">Porsche</option>
 <option value="make/ford-6">Ford</option>
 <option value="make/volvo-7">Volvo</option>
 </select>
<input type="submit" value="submit"/>
</form>

JavaScript

$("#CarSearch").submit(function() {
  var formAction1 = $("#Style").val();
  var formAction2 = $("#Make").val();
    alert("/cars/"+formAction1+"/"+formAction2);
  $("#CarSearch").attr("action", "/cars/" + formAction1 + "/"+ formAction2);
});