What is JavaScript onload function?

This JavaScript function is used in different condition like displaying a print page or directing focus ( keeping the crusher blinking ) to user input field as soon as the page is loaded. The other way to achieve the same result is by using onload inside body tag of the page.

What is onload event?

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). UiEvent if generated from a user interface, Event otherwise. Using onload on an element.

How do I execute a JavaScript immediately after a page is loaded?

Execute a JavaScript immediately after a page has been loaded: More "Try it Yourself" examples below. The onload event occurs when an object has been loaded. onload is most often used within the element to execute a script once a web page has completely loaded all content (including images, script files, CSS files, etc.).

What is the difference between document onload and window onload?

The difference between the document.onload and window.onload is: document.onload triggers before the loading of images and other external content. It is fired before the window.onload. While the window.onload triggers when the entire page loads, including CSS files, script files, images, etc. Let's understand this event by using some examples.