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.
Instance properties
In addition to the properties of Event
, this interface offers the following:
RTCDTMFToneChangeEvent.tone
Read only-
A string 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 string representing the type of the event (always"tonechange"
); the second a dictionary containing the initial state of the properties of the event.
Instance 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 the section on When a tone finishes playing. 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.
js
dtmfSender.addEventListener(
"change",
(event) => {
if (event.tone !== "") {
dialStringBox.innerText += event.tone;
} else {
sendDTMFButton.disabled = false;
}
},
false
);
Specifications
Specification |
---|
WebRTC: Real-Time Communication in Browsers # dom-rtcdtmftonechangeevent |
Browser compatibility
BCD tables only load in the browser
See also
- WebRTC
- Its usual target:
RTCDTMFSender
.