JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.8.3.js"></script>

<div class="text1">text1</div>
<div class="text2">test2</div>
<textarea name="text" id="textarea_id"></textarea>
<button class="add">add</button>

<script>
$("button.add").click(function() {
    var text1 = $('.text1').text();
	var text2 = $('.text2').text();
	$('#textarea_id').val($('#textarea_id').val()+text1+text2);
	
});
</script>