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MediaRecorder.ondataavailable обработчик события (часть MediaStream Recording API) обрабатывает dataavailable событие, позволяет выполнить код в ответ на Blob данные доступные для использования.

Событие dataavailable вызывается когда MediaRecorder доставляет медиа-данные в ваше приложение для использования. Данные предоставляются в Blob объекте. Это происходит в четырёх ситуациях:

  • Когда медиа-поток завершён, любые мультимедийные данные ещё не доставленные в обработчик ondataavailable передаются в одном Blob.
  • When MediaRecorder.stop() is called, all media data which has been captured since recording began or the last time a dataavailable event occurred is delivered in a Blob; after this, capturing ends.
  • When MediaRecorder.requestData() is called, all media data which has been captured since recording began or the last time a dataavailable event occurred is delivered; then a new Blob is created and media capture continues into that blob.
  • If a timeslice property was passed into the MediaRecorder.start() method that started media capture, a dataavailable event is fired every timeslice milliseconds. That means that each blob will have a specific time duration (except the last blob, which might be shorter, since it would be whatever is left over since the last event). So if the method call looked like this — recorder.start(1000); — the dataavailable event would fire after each second of media capture, and our event handler would be called every second with a blob of media data that's one second long. You can use timeslice alongside MediaRecorder.stop() and MediaRecorder.requestData() to produce multiple same-length blobs plus other shorter blobs as well.

The Blob containing the media data is available in the dataavailable event's data property.


MediaRecorder.ondataavailable = function(event) { ... }
MediaRecorder.addEventListener('dataavailable', function(event) { ... })



  mediaRecorder.onstop = function(e) {
    console.log("data available after MediaRecorder.stop() called.");

    var audio = document.createElement('audio');
    audio.controls = true;
    var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
    var audioURL = window.URL.createObjectURL(blob);
    audio.src = audioURL;
    console.log("recorder stopped");

  mediaRecorder.ondataavailable = function(e) {



Specification Status Comment
MediaStream Recording
Определение 'MediaRecorder.ondataavailable' в этой спецификации.
Рабочий черновик Initial definition

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 47[2] 25.0 (25.0) Нет Нет Нет
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support Нет Нет 25.0 (25.0) 1.3[1] Нет Нет Нет Нет

[1] The intial Firefox OS implementation only supported audio recording.

[2] To try this feature on Chrome, enable Experimental Web Platform features from chrome://flags . Currently only video is supported, not audio.

See also

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