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 MessageChannel.onmessage
.
Note: This feature is available in Web Workers.
Syntax
port.start()
Returns
Void.
Parameters
None.
Example
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();
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'start()' in that specification. |
Living Standard |
Browser compatibility
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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
start | Chrome Full support 4 | Edge Full support 12 | Firefox Full support Yes | IE Full support 10 | Opera Full support 10.6 | Safari Full support 5 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android No support No | Opera Android Full support 11 | Safari iOS Full support 5.1 | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support