This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The read-only RTCDataChannel
property id
returns an ID number (between 0 and 65,534) which uniquely identifies the RTCDataChannel
. This ID is set at the time the data channel is created, either by the user agent (if RTCDataChannel.negotiated
is false
) or by the site or app script (if negotiated
is true
).
Each RTCPeerConnection
can therefore have up to a theoretical maximum of 65,534 data channels on it, although the actual maximum may vary from browser to browser.
In early versions of the WebRTC specification, this property's name was stream
. Code that uses that property needs to be updated.
Syntax
var id = aDataChannel.id;
Value
An unsigned short
value (that is, an integer between 0 and 65,535) which uniquely identifies the data channel.
While the label
property doesn't have to be unique, this ID number is guaranteed to be unique among all data channels. Additionally, known implementations of WebRTC use the same ID on both peers. A unique ID makes it easier for your code to do its own out-of-band data channel-related signaling.
This can be also useful for logging and debugging purposes.
Example
var pc = new RTCPeerConnection();
var dc = pc.createDataChannel("my channel");
console.log("Channel id: " + dc.id);
Specifications
Specification | Status | Comment |
---|---|---|
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCDataChannel.id' in that specification. |
Candidate Recommendation | Initial specification. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
id | Chrome Full support 56 | Edge Full support ≤79 | Firefox No support No | IE No support No | Opera Full support 43 | Safari No support No | WebView Android Full support 56 | Chrome Android Full support 56 | Firefox Android No support No | Opera Android Full support 43 | Safari iOS No support No | Samsung Internet Android Full support 6.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.