PDF vs HTML

Hello PDFScripting.
Thank you so much for all these wonderful tutorials. I have a query. Actually, I am using an acrobat 9 pro to create editable pdf and also have a submit button in pdf itself to submit a form to a backend server. My main concern is to send pdf data to the backend server for further processing. I am using this.hostContainer.postMessage(msg) to communicate between embedded pdf and the browser. The major problem here is this.hostContainer is always undefined in pdf scripting.

Also, I have been searching for this very long time and I could not find any solution though.

Some forums even say that Acrobat 9 pro have a problem with hostContainer.

Looking forward to your help. Thanks