JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div_testid">click me</div>
<textarea id="ta_testid" value="this is a teaxtarea"></textarea>

CSS

#ta_testid {    
display:none;    
}

JavaScript

var id = 'testid';
$('#div_'+id).click(function(){
   $('#ta_'+id).css({display:'block'});
})