JSFiddle - React, Tailwind, and code Playground

HTML

<label><input type="radio" name="kb" value="uni" id="unikb"/>Unicode</label>
<label><input type="radio" name="kb" value="zawgyi" id="zawgyikb"/>Zawgyi</label>
<br/><br/>
<textarea id="desp"></textarea>

JavaScript

$("input[type='radio']").click(function(e) {
    if ( $(this).val()=='uni'){ 
        $("textarea").val('');
    }else{
        $("textarea").val('');
    }    
});