Dynamic Height of Text area
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.msg {
width:300px;
margin:100px;
}
.msg_caption {
width:100%;
overflow:hidden;
margin-bottom:1px;
}
.msg_caption span {
display:block;
float:left;
margin:0 2px;
padding:4px 10px;
background:#898989;
cursor:pointer;
color:white;
}
.msg textarea{
width:300px;
border:1px solid #000;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js"></script>
<script>
$(function () {
let $comment=$("#comment");
$('.bigger').click(function(){
if(!$comment.is(":animated")){
if($comment.height()<500){
$comment.animate({height:"+=50"},400);
}
}
});
$(".smaller").click(function () {
if(!$comment.is(":animated")){
if($comment.height()>50){
$comment.animate({height:"-=50"},400);
}
}
});
});
</script>
</head>
<body>
<form method="post" action="#">
<div class="msg">
<div class="msg_caption">
<span class="bigger">Large</span>
<span class="smaller">Small</span>
</div>
<div>
<textarea id="comment" cols="20" rows="8">Multi-line text box height changes. Multi-line text box height changes. Multi-line text box height changes. Multi-line text box height changes. Multi-line text box height changes. Multi-line text box height changes.
</textarea>
</div>
</div>
</form>
</body>
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