JSFiddle - React, Tailwind, and code Playground

HTML

<select name="analysis" id="analyses" onchange="test()">
     <option value="" disabled="disabled" selected="selected">Select Analysis</option>
      <option value="distance">distance</option>
      <option value="clustered">clustering</option>
</select>

JavaScript

window.test = function() {
    // Javascript
    var sel = document.getElementById("analyses");
    if (sel.options[sel.selectedIndex].value == "distance")
        alert('Javascript: selected');
    else
        alert('Javascript: not selected');
        
    // JQuery
    if ($("#analyses").val() == 'distance')
        alert('JQuery: selected');
    else
        alert('JQuery: not selected');
}