How to obtain the value of Fckeditor in iframe

Because the FCKeditor tag does not support some html events, how to directly use js to obtain the value of the event is as follows:
It becomes a problem.
Idea: Use the js function automatically loaded by Fckeditor on the page containing FCKeditor to pass the modified value of the obtained content to a hidden, and then use js on the parent page to obtain the value of hidden, form submission
Iframe page:
Java code
<Script type = "text/javascript">

// FCK automatically loads this function
Function FCKeditor_OnComplete (editorInstance ){
EditorInstance. Events. AttachEvent ('onblur', checkTextValue );
}
// Check the input box
Function checkTextValue (){
Var introducevalue = FCKeditorAPI. GetInstance ("EditorDefault"). EditorDocument. body. innerText;
// Alert (introducevalue );
Document. getElementById ("hidden"). value = introducevalue;

If (introducevalue = ""){
Alert ("content cannot be blank ");
}
}
</Script>
Parent page;
<Script type = "text/javascript">
Function check ()
{
Alert (window. frames ["qq" ].doc ument. getElementById ("hidden"). innerHTML );
}
</Script>

Author "diligence"