Provides the event handler for the ondataavailable event.
Syntax
HRESULT ondataavailable(void);
C/C++ Return Value
Returns S_OK if successful, or an error code otherwise.
Remarks
When handling asynchronous data, it is useful to be able to start processing in parallel with the download as soon as data becomes available. The ondataavailable event fires as soon as data is available for such processing. The readystate property defines several states that more closely specify the current status of the asynchronous download.
This member is an extension of the W3C DOM.