RTCDTMFToneChangeEvent

The RTCDTMFToneChangeEvent interface represents events sent to indicate that DTMF tones have started or finished playing. This interface is used by the tonechange event.

Properties

In addition to the properties of Event, this interface offers the following:

RTCDTMFToneChangeEvent.tone Read only

A DOMString specifying the tone which has begun playing, or an empty string ("") if the previous tone has finished playing.

Constructors

RTCDTMFToneChangeEvent()

Returns a new RTCDTMFToneChangeEvent. It takes two parameters, the first being a DOMString representing the type of the event (always "tonechange"); the second a dictionary containing the initial state of the properties of the event.

Methods

Supports the methods defined in Event. There are no additional methods.

Examples

This snippet is derived loosely from the full, working example you'll find in When a tone finishes playing in Using DTMF with WebRTC. It appends each tone to a display box as it's played, and, once all tones have been sent, re-enabled a previously-disabled "Send" button, allowing the next DMTF string to be entered.

dtmfSender.addEventListener("change", function(event) {
  if (event.tone !== "") {
    dialStringBox.innerText += event.tone;
  } else {
    sendDTMFButton.disabled = false;
  }
}, false);

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
RTCDTMFToneChangeEvent
27
12
52
No
Yes
13.1
4.4
27
52
Yes
13.4
1.5
RTCDTMFToneChangeEvent
27
≤18
52
No
Yes
13.1
4.4
27
52
Yes
13.4
1.5
tone
27
12
52
No
Yes
13.1
4.4
27
52
Yes
13.4
1.5

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/RTCDTMFToneChangeEvent