在此页

• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

The WebRTC open event is sent to an RTCDataChannel 对象的 onopen event handler when the underlying transport used to send and receive the data channel's messages is opened or re-opened.

冒泡	No
可取消	No
接口	RTCDataChannelEvent
事件处理程序特性	onopen

范例

This example adds to the RTCDataChannel dc a handler for the open event that adjusts the user interface to indicate that a chat window is ready to be used after a connection has been established. It enables the message input box and send button as well as enabling the disconnect button and disabling the connect button. Finally, the message input box is focused so the user can immediately begin to type.

dc.addEventListener("open", ev => {
  messageInputBox.disabled = false;
  sendMessageButton.disabled = false;
  disconnectButton.disabled = false;
  connectButton.disabled = true;
  messageInputBox.focus();
}, false);
					

This can also be done by directly setting the value of the channel's onopen event handler property.

dc.onopen = ev => {
  messageInputBox.disabled = false;
  sendMessageButton.disabled = false;
  disconnectButton.disabled = false;
  connectButton.disabled = true;
  messageInputBox.focus();
}
					

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
open event	Chrome 56	Edge ≤79	Firefox Yes	IE No	Opera 43	Safari Yes	WebView Android 56	Chrome Android 56	Firefox Android Yes	Opera Android 43	Safari iOS Yes	Samsung Internet Android 6.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• WebRTC API
• A simple RTCDataChannel example
• 相关事件： message , close ，和 error

元数据

• 最后修改： Mar 18, 2019

相关话题

1. WebRTC API
2. RTCDataChannel
3. 特性

   1. binaryType
   2. bufferedAmount
   3. bufferedAmountLowThreshold
   4. id
   5. label
   6. maxPacketLifeTime
   7. maxRetransmits
   8. negotiated
   9. onbufferedamountlow
   10. onclose
   11. onclosing
   12. onerror
   13. onmessage
   14. onopen
   15. ordered
   16. 协议
   17. readyState
   18. reliable
   19. stream
4. 方法

   1. close()
   2. send()
5. 继承：

   1. EventTarget
6. Related pages for WebRTC

   1. MediaDevices.getUserMedia()
   2. Navigator.mediaDevices
   3. RTCCertificate
   4. RTCDTMFSender
   5. RTCDTMFToneChangeEvent
   6. RTCDataChannelEvent
   7. RTCDtlsTransport
   8. RTCErrorEvent
   9. RTCIceCandidate
   10. RTCIceTransport
   11. RTCPeerConnection
   12. RTCPeerConnectionIceErrorEvent
   13. RTCPeerConnectionIceEvent
   14. RTCRtpReceiver
   15. RTCRtpSender
   16. RTCRtpTransceiver
   17. RTCSctpTransport
   18. RTCSessionDescription
   19. RTCStatsEvent
   20. RTCStatsReport
   21. RTCTrackEvent