Baseline Widely available
The read-only property RTCDTMFToneChangeEvent.tone
returns the DTMF character which has just begun to play, or an empty string (""
). if all queued tones have finished playing (that is, RTCDTMFSender.toneBuffer
is empty).
A string with the DTML character playing, or the empty string.
ExampleThis example establishes a handler for the tonechange
event which updates an element to display the currently playing tone in its content, or, if all tones have played, the string "<none>".
dtmfSender.ontonechange = (ev) => {
let tone = ev.tone;
if (tone === "") {
tone = "<none>";
}
document.getElementById("playingTone").innerText = tone;
};
Specifications Browser compatibility See also
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