Web/API/EventSource/message event

The message event of the EventSource API is fired when data is received through an event source.

Bubbles	No
Cancelable	No
Interface	`MessageEvent`
Event handler property	`EventSource.onmessage`

Examples

In this basic example, an EventSource is created to receive events from the server; a page with the name sse.php is responsible for generating the events.

var evtSource = new EventSource('sse.php');
var eventList = document.querySelector('ul');

evtSource.addEventListener('message', (e) => {
  var newElement = document.createElement("li");

  newElement.textContent = "message: " + e.data;
  eventList.appendChild(newElement);
});

onmessage equivalent

evtSource.onmessage = (e) => {
  var newElement = document.createElement("li");

  newElement.textContent = "message: " + e.data;
  eventList.appendChild(newElement);
};

Specifications

Specification	Status
HTML Living StandardThe definition of 'message event' in that specification.	Living Standard

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`message` event	Chrome Full support 6	Edge Full support 79	Firefox Full support 6	IE No support No	Opera Full support Yes	Safari Full support 5	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 45	Opera Android Full support 12	Safari iOS Full support 5	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support