JSFiddle - React, Tailwind, and code Playground

HTML

<div id="draggable">
    <textarea></textarea>
</div>

CSS

body{
    background-color: #ccc;
}

#draggable{
    background-color: blue;
    display: inline-block;
    padding: 75px;
}

JavaScript

$("textarea").focusout(function(){
    alert("Do something");
}).click(function(e){
    e.stopPropagation();
    return true;
});

$("#draggable").draggable({
    start: function( event, ui ) {
        if( $('textarea:focus', this).length ){
            $('textarea', this).focusout();
        }
    }
}).click(function(e){
    if( $('textarea:focus', this).length ){
            $('textarea', this).focusout();
    }
});