onopen Event
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onopen Event
❮ DOM Events
❮ Event Object
Example
Create a new EventSource object, and specify the URL of the page sending the
updates.
When (and if) a connection is established, output some text in a
<h1> element:
var source = new EventSource("demo_sse.php");
source.onopen = function()
document.getElementById("myH1").innerHTML = "Getting server updates";
;Try it Yourself »
Definition and Usage
The onopen event occurs when a connection with an event source is opened.
Related events:
onmessage - Occurs when a message is received
onerror - Occurs when a problem occurs
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 | |||||
|---|---|---|---|---|---|
| onopen | 9.0 | Not supported | 6.0 | 5.0 | 11.0 |
Syntax
object.onopen = function()myScript;
Try it Yourself »
Using the addEventListener() method:
object.addEventListener("open", myScript);
Try it Yourself »
Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.
Technical Details
| Bubbles: | No |
|---|---|
| Cancelable: | No |
| Event type: | Event |
❮ DOM Events
❮ Event Object
