set "onInput" and "onpropertychange" listener on iframe

[javascript123456]

i am trying to make a comment editor with iframe, and want to trigger the change of content inside iframe, the following code cant work.

it is strange because it works fine when i replace them with "keypress" and "blur"

Code: Select all

<iframe id="iframe"></iframe>

<script>

frameobj=document.getElementById('iframe').contentWindow;

// IE
frameobj.attachEvent('onpropertychange', function(){alert();} );

//FireFox
frameobj.addEventListener('input', function(){alert();} , false);

</script>