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MediaRecorder.onstart

The MediaRecorder.onstart event handler (part of the MediaRecorder API) handles the start event, allowing you to run code in response to media recording being started by a MediaRecorder.

The start event is thrown as a result of the MediaRecorder.start() method being invoked. At this point, the data starts being gathered into a Blob.

Syntax

MediaRecorder.onstart = function(event) { ... }
MediaRecorder.addEventListener('start', function(event) { ... })

Example

...

  record.onclick = function() {
    mediaRecorder.start();
    console.log("recorder started");
  }

  mediaRecorder.onstart = function() {
    // do something in response to
    // recording being started
  }

...

Properties

None.

Specifications

Specification
MediaStream Recording # dom-mediarecorder-onstart

Browser compatibility