Web/API/ReadableStreamDefaultController/close
The close()
method of the ReadableStreamDefaultController
interface closes the associated stream.
Readers will still be able to read any previously-enqueued chunks from the stream, but once those are read, the stream will become closed. If you want to completely get rid of the stream and discard any enqueued chunks, you'd use ReadableStream.cancel()
or ReadableStreamDefaultReader.cancel()
.
Syntax
readableStreamDefaultController.close();
Parameters
None.
Return value
undefined
.
Exceptions
- TypeError
- The source object is not a
ReadableStreamDefaultController
.
Examples
In the following simple example, a custom ReadableStream
is created using a constructor (see our [[../../../../../../../mdn.github.io/dom-examples/streams/simple-random-stream/index|Simple random stream example]] for the full code). The start()
function generates a random string of text every second and enqueues it into the stream. A cancel()
function is also provided to stop the generation if ReadableStream.cancel()
is called for any reason.
When a button is pressed, the generation is stopped, the stream is closed using ReadableStreamDefaultController.close()
, and another function is run, which reads the data back out of the stream.
const stream = new ReadableStream({
start(controller) {
interval = setInterval(() => {
let string = randomChars();
// Add the string to the stream
controller.enqueue(string);
// show it on the screen
let listItem = document.createElement('li');
listItem.textContent = string;
list1.appendChild(listItem);
}, 1000);
button.addEventListener('click', function() {
clearInterval(interval);
fetchStream();
controller.close();
})
},
pull(controller) {
// We don't really need a pull in this example
},
cancel() {
// This is called if the reader cancels,
// so we should stop generating strings
clearInterval(interval);
}
});
Specifications
Specification | Status | Comment |
StreamsThe definition of 'close()' in that specification. | Living Standard | Initial definition. |
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.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
? |
Edge
? |
Firefox Full support 65 Full support 65 Full support 57 Disabled' From version 57: this feature is behind the |
IE
No support No |
Opera
? |
Safari
? |
WebView Android
? |
Chrome Android
? |
Firefox Android Full support 65 Full support 65 Full support 57 Disabled' From version 57: this feature is behind the |
Opera Android
? |
Safari iOS
? |
Samsung Internet Android
? |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
- User must explicitly enable this feature.'
- User must explicitly enable this feature.
ReadableStreamDefaultController.close() by Mozilla Contributors is licensed under CC-BY-SA 2.5.