onDataSetChanged
The instruction(s) to be executed are placed within quotes. This event handler will execute the instruction(s) when the data for an element has changed or the original data is complete or ready.

The following example will display text of your choosing in a message box when the data for an element has changed or the original data is complete or ready:
onDataSetChanged="msgWindow.document.write('-- Insert text message here --')"
This Event Handler is used with the following:

APPLET
AREA
BODY
IMG
OBJECT