MIDIOutput: send() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The send() method of the MIDIOutput interface queues messages for the corresponding MIDI port. The message can be sent immediately, or with an optional timestamp to delay sending.
Syntax
send(data)
send(data, timestamp)
Parameters
data-
A sequence of one or more valid MIDI messages. Each entry represents a single byte of data.
timestampOptional-
A
DOMHighResTimestampwith the time in milliseconds when the message should be sent (relative toPerformance.timeOrigin).
Return value
None (undefined).
Exceptions
TypeError-
Thrown if
datais not a valid sequence, or does not contain a valid MIDI message. InvalidAccessErrorDOMException-
Thrown if
datais a system exclusive message, and theMIDIAccessdid not enable exclusive access. InvalidStateErrorDOMException-
Thrown if the port is disconnected.
Examples
In the following example a middle C note is sent immediately, followed by a note off message one second later.
function sendMiddleC(midiAccess, portID) {
const noteOnMessage = [0x90, 60, 0x7f]; // Note on middle C, full velocity
const output = midiAccess.outputs.get(portID);
output.send(noteOnMessage); // Omitting the timestamp means send immediately.
output.send([0x80, 60, 0x40], window.performance.now() + 1000.0); // timestamp = now + 1000ms.
}
Specifications
| Specification |
|---|
| Web MIDI API # dom-midioutput-send |
Browser compatibility
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