SourceBuffer: updatestart event
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Note: This feature is available in Dedicated Web Workers.
The updatestart
event of the SourceBuffer
interface signals the beginning of an appendBuffer()
or remove()
operation. The updating
attribute transitions from false
to true
.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("updatestart", (event) => { })
onupdatestart = (event) => { }
Event type
A generic Event
.
Examples
>Listening for the updatestart event
js
const sourceBuffer = source.addSourceBuffer(mimeCodec);
sourceBuffer.addEventListener("updatestart", () => {
downloadStatus.textContent = "Modifying buffer...";
});
sourceBuffer.addEventListener("updateend", () => {
downloadStatus.textContent = "Modification complete";
});
Specifications
Specification |
---|
Media Source Extensions™> # dfn-updatestart> |
Media Source Extensions™> # dom-sourcebuffer-onupdatestart> |
Browser compatibility
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