javascript - Auto-adjusting textarea to be the same height as inner-text onkeydown -


i'm trying auto adjust height of textarea onkeydown, it's working partially. when you're typing text textarea, auto-adjust height of textarea per new line of text, want. when you're backspacing text, auto-adjust height of textarea per character-backspaced when you're on last 5 characters of every last line. doing wrong? 

#textarea {  overflow: hidden;  }   <textarea id = 'textarea' onkeydown = "adjust()"></textarea>   <script>  function adjust() {   document.getelementbyid("textarea").style.height = document.getelementbyid("textarea").scrollheight+'px';   } //end of function adjust()  </script>

create textarea:

<textarea id="textarea" onkeyup="inputadjust(this)"></textarea>

then create function auto height 

<script>     function inputadjust(o) {         o.style.height = "1px";         o.style.height = (25+o.scrollheight)+"px";     } </script>

now +25px, can change it.

example: https://jsfiddle.net/urp4nbxf/1/


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