onDataAvailable
The instruction(s) to be executed are placed within quotes. This event handler will execute the instruction(s) when the data has arrived from a data source for an element.

The following example will display text of your choosing in a message box when the data has arrived from a data source for an element:
onDataAvailable="msgWindow.document.write('-- Insert text message here --')"
This Event Handler is used with the following:

APPLET
AREA
BODY
IMG
OBJECT