Here we will learn how to use an event listener to pop up an alert box.
We are familiar with how to place an HTML attribute like
onmouseover that will execute upon a user's mouse entering the space of the HTML element. This is a frequent method of creating roll-over actions for buttons on website navigation. When editing a website that has these code-heavy roll overs, it can be confusing how to alter the roll overs. They create quite a bit of code.
Now MooTools makes our lives easy; we see that MooTools itself is becoming an oldie-and-goodie. It is exciting to learn that using listeners, heretofore a
jUnGlE of confusing syntax, is now as simple as calling the
addEvent() method ...