JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript">
jQuery(document).ready(function(){
    jQuery('#kopko').change(function() {
        $("#" + this.value).show().siblings().hide();
    });
    jQuery("#kopko").change();
});			
</script>

<select id="kopko">
<option value="box1">Box 1111</option>
<option value="box2">Box 2222</option>
<option value="box3">Box 3333</option>
</select>

<div>
<div id="box1"><p>Box 1 stuff...</p></div>
<div id="box2"><p>Box 2 stuff...</p></div>
<div id="box3"><p>Box 3 stuff...</p></div>
</div>