The oncomplete event handler of the OfflineAudioContext interface is called when the audio processing is terminated, that is when the complete event (of type OfflineAudioCompletionEvent) is raised.
var offlineAudioCtx = new OfflineAudioContext(); offlineAudioCtx.oncomplete = function() { ... }
When processing is complete, you might want to use the oncomplete handler the prompt the user that the audio can now be played, and enable the play button.
offlineAudioCtx.oncomplete = function() { console.log('Offline audio processing now complete'); showModalDialog('Song processed and ready to play'); playBtn.disabled = false; }
| Specification | 
|---|
| Web Audio API  # dom-offlineaudiocontext-oncomplete  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
oncomplete | 
25  | 
12  | 
25  | 
No  | 
15  | 
6  | 
≤37  | 
25  | 
25  | 
14  | 
6  | 
1.5  | 
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    https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext/oncomplete