The start()
method of the MessagePort
interface starts the sending of messages queued on the port. This method is only needed when using EventTarget.addEventListener
; it is implied when using onmessage
.
In the following code block, you can see a handleMessage
handler function, run when a message is sent back to this document using onmessage
:
channel.port1.onmessage = handleMessage;
function handleMessage(e) {
para.innerHTML = e.data;
}
Another option would be to do this using EventTarget.addEventListener
, however, when this method is used, you need to explicitly call start()
to begin the flow of messages to this document:
channel.port1.addEventListener("message", handleMessage, false);
function handleMessage(e) {
para.innerHTML = e.data;
textInput.value = "";
}
channel.port1.start();