JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="t" placeholder="enter your text" />
<button id="x">click me</button>

<br/>
<textarea id="tx" rows="5" cols="50"></textarea>

JavaScript

$(function(){
   
    var x = $('#x');
    
    x.mouseup(function(){
        $('#tx').val($('#t').val());
    });
    
    x.mousedown(function() {
        $('#tx').val('');
    });
    
});