MessagePort: start() method
Note: This feature is available in Web Workers.
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.
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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