JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.3/css/bootstrap-select.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.3/js/bootstrap-select.min.js"></script>
<form method="GET" style="margin:50px;">
        <select name="input1" class="selectpicker_test">
            <option>Mustard</option>
            <option>Ketchup</option>
            <option>Relish</option>
        </select>
</form>

JavaScript

$(function(){
    
    $('.selectpicker_test').selectpicker({
        style: 'btn-info',
        size: 4
    });

    var submitSearchForm = function() {
        alert("I'm about to submit the parent form...");
        $(this).parents('form').submit();
    };
    
    $('.selectpicker_test').on('change', submitSearchForm);
    
});