More "Try it Yourself" examples below.
The onload event occurs when an object has been loaded.
onload is most often used within the <body> element to execute a script once a web page has completely loaded all content (including images, script files, CSS files, etc.).
The onload event can be used to check the visitor's browser type and browser version, and load the proper version of the web page based on the information.
The onload event can also be used to deal with cookies (see "More Examples" below).
Note: The addEventListener() method is not supported in Internet Explorer 8 and earlier versions.
|Event type:||UIEvent if generated from a user interface, Event otherwise.|
|Supported HTML tags:||<body>, <frame>, <iframe>, <img>, <input type="image">, <link>, <script>, <style>|
|DOM Version:||Level 2 Events|
Using onload on an <img> element. Alert "Image is loaded" immediately after an image has been loaded:
Using the onload event to deal with cookies: