JSFiddle - React, Tailwind, and code Playground

by rotev

HTML

<form id="blog-comment-form" method="post" action="index.php">
<textarea id="comment" name="b_com"  placeholder="ADD YOUR COMMENT HERE"></textarea>
<input type="submit" name="submit" value="POST COMMENT"/>
</form>

JavaScript

document.getElementById('comment').addEventListener('keyup', showmsg);

function showmsg(e) {
    if (e.keyCode==13) {
        var a = document.getElementById("comment");
    var b = document.getElementById("comment").style.scrollHeight;
    a.style.height = ((a.scrollHeight)+6) + "px"; 
}else {
    var a = document.getElementById("comment");
    var b = document.getElementById("testthis").style.height;
    a.style.height = ((a.scrollHeight)+6) + "px"; 
}

}