onerror Event

Example

Do something if a problem occurs with the event stream:

var source = new EventSource("demo_sse.php");
source.onerror = function() {
// Do something to handle error
};

Description

The onerror event occurs when an error occurs with the event source.

An error usually occurs when a connection is disrupted. If this happens, the EventSource object will automatically attempt to reconnect to the server.

Related events:

onmessage - Occurs when a message is received
onopen - Occurs when a connection to the server is open

For more information about Server-Sent Events, read our HTML5 Server-Sent Events Tutorial.

Browser Support

The numbers in the table specify the first browser version that fully supports the event.

Event
onerror	9.0	Not supported	6.0	5.0	11.0

Syntax

object.onerror = function(){myScript};

Using the addEventListener() method:

object.addEventListener("error", myScript);

Technical Details

Bubbles:	No
Cancelable:	No
Event type:	Event

❮ Event Object