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index.md
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index.md
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---
title: "RTCSctpTransport: statechange event"
short-title: statechange
slug: Web/API/RTCSctpTransport/statechange_event
page-type: web-api-event
browser-compat: api.RTCSctpTransport.statechange_event
---
{{APIRef("WebRTC")}}
A **`statechange`** event is sent to an {{domxref("RTCSctpTransport")}} to provide notification when the {{domxref("RTCSctpTransport.state")}} property has changed.
<!-- This event is not cancelable and does not bubble. -->
## Syntax
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
```js
addEventListener("statechange", (event) => {});
onstatechange = (event) => {};
```
## Event type
A generic {{domxref("Event")}}.
## Examples
Given an {{domxref("RTCSctpTransport")}}, `transport`, and an `updateStatus()` function that presents connection state information to the user, this code sets up an event handler to let the user know when the transport is connected.
```js
pc.addEventListener(
"statechange",
(event) => {
switch (transport.state) {
case "connected":
updateStatus("Connection started");
break;
}
},
false,
);
```
Using `onstatechange`, it looks like this:
```js
transport.onstatechange = (event) => {
switch (transport.state) {
case "connected":
updateStatus("Connection started");
break;
}
};
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [WebRTC API](/en-US/docs/Web/API/WebRTC_API)
- {{domxref("RTCSctpTransport.state")}}