MIDIOutput.send()

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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

MIDIOutput.send(data, timestamp);

Parameters

data

A sequence of one or more valid MIDI messages. Each entry represents a single byte of data.

timestampOptional

A DOMHighResTimestamp with the time in milliseconds, which is the delay before sending the message.

Exceptions

TypeError

Thrown if data is not a valid sequence, or does not contain a valid MIDI message.

InvalidAccessError

Thrown if data is a system exclusive message, and the MIDIAccess did not enable eclusive access.

InvalidStateError

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 ) {
  var noteOnMessage = [0x90, 60, 0x7f];    // note on middle C, full velocity
  var 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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