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


-

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