javascript - onkeyup event not working in textarea -

i have basic input/output structure in html:

<textarea id="input" onkeyup="sendcode()"> hello world! </textarea>   <div id="output"></div> 

and have js function should pass input output:

var input = document.getelementbyid("input"); var output = document.getelementbyid("output");  function sendcode(){  output.innerhtml = input.innerhtml; } 

the sendcode() function works when call manually, seems onkeyup event not firing in textarea.

here jsfiddle: http://jsfiddle.net/mudroljub/y5a2n8ab/

any help?

update: jsfiddle updated , working now.

use value since it's not content text value property

var input = document.getelementbyid("input"); var output = document.getelementbyid("output");  function sendcode(){  output.innerhtml = input.value; } 

and working demo here