I have an Umbraco site which makes use of rich text editors in the backend and I'm attempting to 'hook' in to the TinyMCE onchange_callback.

I've been fumbling around hoping to come across something and I found the tinyMCEConfig.config file which allows you to set custom settings from the tinyMCE configuration settings - http://www.tinymce.com/wiki.php/Configuration3x

I dropped in a 'height' setting of 1500 as a test and this works perfectly. However, I'm also trying to use both oninit and the onchange_callback settings to call a function so that I can hopefully grab the content of the editor.

<customConfig>
    <!--    <config key="myKey">mySetting</config>-->
    <config key="entity_encoding">raw</config>
    <config key="height">1500</config>
    <config key="oninit">testfunc</config>
    <config key="onchange_callback">testfunc</config>
    <config key="codemirror">
      {
        "indentOnInit": false,
        "path": "../../../../lib/codemirror",
        "config": {
      },
      "jsFiles": [
      ],
      "cssFiles": [
      ]
    }
  </config>
</customConfig>

I have a test function set up in a file which I'm including in the backend through a custom package.manifest file:

{
    "css": [
        "/assets/css/admin.css"
    ],
    "javascript": [
        "/assets/js/admin.js"
    ]
}

The javascript file/function:

var testfunc = function () {
    alert('test h');
}

All pretty simple but I get an error for the onit setting (thrown from tinyMCE):

Uncaught TypeError: n.apply is not a function

Where am I going wrong here?