It's the Task Details screen that this is on, and the javascript is in Custom_InTaskDetails.js, so it should be the correct frame. I'm able to successfully get default hidden field values (eg. "TemplateName") so I'm wondering if this is specific to extension fields? The two fields I'm trying to get at are part of a Text Area field as shown below. Or should I be getting the text from the object itself (REQUEST:EXTFLDV_500221_HTML_EDITOR)? I likewise was unable to get data from this.
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<DIV class="Size-Large" iwtype="field-TextArea" fieldid="REQUEST:EXTFLDV_500221" entitytype="500341" iwpropentitytype="entitytype" addedByDesigner="1" iwpropref="ref" ref="500221" iwpropclasstextarea="class"><LABEL for=REQUEST:EXTFLDV_500221_HTML_EDITOR iwpropdisplay="display" iwpropid="id" iwpropvisible="style.display">RFC Revision Comments</LABEL><INPUT id=REQUEST:EXTFLDV_500221 type=hidden name=REQUEST:EXTFLDV_500221><INPUT id=REQUEST:EXTFLDV_500221_HTML type=hidden name=REQUEST:EXTFLDV_500221_HTML>
<OBJECT id=REQUEST:EXTFLDV_500221_HTML_EDITOR class="RichText" tabIndex=1 name=REQUEST:EXTFLDV_500221_HTML_EDITOR classid=clsid:633D2265-5264-4D33-BF2A-7D7A6B38201A ismReadOnly="False" iwpropreadonly="ismReadOnly" iwpropconditionalmandatoryon="ismConditionalMandatoryOn" iwpropmandatoryon="ismMandatoryOn" iwpropconditionalmandatory="ismConditionalMandatory" iwpropmandatory="ismMandatory" iwpropid="id"><param name=HTMLField value="REQUEST:EXTFLDV_500221_HTML"><param name=PlainTextField value="REQUEST:EXTFLDV_500221"><param name=SystemFormatField value="SystemTextFormat"><param name=AutoPopulate value="True"></OBJECT></DIV>
