RTCDTMFToneChangeEvent - Web APIs 编辑
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 aDOMString
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
Specification | Status | Comment |
---|---|---|
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDTMFToneChangeEvent' in that specification. | Candidate Recommendation | Initial definition. |
Browser compatibility
BCD tables only load in the browser
See also
- WebRTC
- Its usual target:
RTCDTMFSender
.
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