onload() event handler is what you will need to solve your problems!
We covered the
onclick() event handler a couple of videos ago, in this tutorial, we're going to look at the onload event handler. We normally see the onclick event handler applied to buttons but you can add it to text, images, videos, canvases, etc.
The same can be said for the onload event handler, but the way we'll be using the onload event handler in this tutorial is as a method of the window object. Although it can be added to other elements such as images, understanding how it works with the window object will allow you to easily understand how it works with everything else. So let's take a look.
Remember to checkout the Resources section below for associated downloadable content, JSFiddle links, and other resources. Watch the video and follow along!