JSFiddle - React, Tailwind, and code Playground

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<select name="Severity-of-your-symptoms" id="Severity-of-your-symptoms" class="cformselect" >
    <option value="full01_severity_notselected" selected="selected">Please select...</option>
    <option value="Mild">Mild</option>
    <option value="Moderate">Moderate</option>
    <option value="Severe">Severe</option>
    <option value="full01_severity_other">Other</option>
</select>
<br />
<input type="text" id="li-10-14" />

JavaScript

$('#Severity-of-your-symptoms').change(function() {
  $("#li-10-14")[$(this).val() == "full01_severity_other" ? 'show' : 'hide']("fast");
}).change();