What is the difference between onload function and window?

Inside window.onload function () {}) will run as soon as all page resources are loaded. One more interesting difference is that window.onload will only be called once, and it will override the previously attached onload event.

How do I call a JavaScript function after a page is loaded?

Traditionally, to call a JavaScript function once the page has loaded, you'd add an onload attribute to the body containing a bit of JavaScript (usually only calling a function) When the page has loaded, I want to run some JavaScript code to dynamically populate portions of the page with data from the server.

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.

What does DOMContentLoaded mean in JavaScript?

DOMContentLoaded It means when the DOM objects of the document are fully loaded and seen by JavaScript. Also this could have been "click", "focus"... function () Anonymous function, will be invoked when the event occurs. Note that this will not work in IE 8 and lower. Otherwise this is the best pure JS solution!