onloadstart event

ProgressEvent that occurs when a read operation is started by an MSStreamReader or FileReader object.

Syntax

Event Property object.onloadstart = handler;
addEventListener Method object.addEventListener("loadstart", handler, useCapture)

Event handler parameters

handler [in]

Type: function

Handler function to process the loadstart event.

Remarks

This event will always fire after a read method is successfully called on an MSStreamReader or FileReader object and before any other events are fired by the objects for the read operation.

When this event fires, the lengthComputable property of the ProgressEvent is initialized to false. The length property of the ProgressEvent is initialized to 0 (zero) and the total property is initialized to 0 (zero).

See also

FileReader
msStreamReader
ProgressEvent
onprogress

 

 

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