MessagePort: start() method
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.
Note: This feature is available in Web Workers
Syntax
js
start()
Parameters
None.
Return value
None (undefined).
Examples
In the following code block, you can see a handleMessage handler function,
run when a message is sent back to this document using onmessage:
js
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:
js
channel.port1.addEventListener("message", handleMessage, false);
function handleMessage(e) {
para.innerHTML = e.data;
textInput.value = "";
}
channel.port1.start();
Specifications
| Specification |
|---|
| HTML Standard # dom-messageport-start-dev |
Browser compatibility
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