When you type text, a textarea expands in size. But what if you want it to dynamically decrease its height when deleting text?
$('textarea').on('input', function() {
var scrollHeight = parseInt($(this).prop('scrollHeight'));
$(this).height(scrollHeight);
});.OuterDiv
{
width:200px;
height:300px;
border:1px solid #000;
position:relative;
bottom:0;
}
.text
{
resize:none;
width:198px;
height:45px;
max-height:145px;
background-color:rgba(90,90,180,1);
font-size:16px;
font-family:Arial;
overflow-y:auto;
padding:0;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="OuterDiv">
<textarea class="text" placeholder="Write some text..."></textarea>
</div>