Use the event name in methods likeaddEventListener(), or set an event handler property.

addEventListener("bufferedamountlow", (event) => { })onbufferedamountlow = (event) => { }

A genericEvent.

This example sets up a handler forbufferedamountlow to request more data any time the data channel's buffer falls below the number of bytes specified bybufferedAmountLowThreshold, which we have set to 65536. In other words, we'll try to keep at least 64kB of data in the buffer, reading 64kB at a time from the source.

let pc = new RTCPeerConnection();let dc = pc.createDataChannel("SendFile");// source data objectlet source = (dc.bufferedAmountLowThreshold = 65536);pc.addEventListener(  "bufferedamountlow",  (ev) => {    if (source.position <= source.length) {      dc.send(source.readFile(65536));    }  },  false,);

After creating theRTCPeerConnection, this callsRTCPeerConnection.createDataChannel() to create the data channel. Then a listener is created forbufferedamountlow to refill the incoming data buffer any time its contents fall below 65536 bytes.

You can also set up a listener forbufferedamountlow using its event handler property,onbufferedamountlow:

pc.onbufferedamountlow = (ev) => {  if (source.position <= source.length) {    dc.send(source.readFile(65536));  }};

• WebRTC API
• RTCDataChannel
• RTCDataChannel.bufferedAmountLowThreshold