Hi,
Blur, Change, focus etc are the listerner that you can add to your Richtext,
Apart from that you can also add beforesubmit event listener to your dialog which will get fired when user click "Ok" on dialog.
KEEP In MIND,
Other fields like textarea, textfield contains only text, so it becomes easy to parse ...but in your case its richtext so you need to parse HTML+ TEXT
Let me know if you have any doubt.