JavaScript for Kids

Chapter 10. Interactive Programming

Until now, the JavaScript code on our web pages has run as soon as the page is loaded, pausing only if we include a call to a function like alert or confirm. But we don’t always necessarily want all of our code to run as soon as the page loads—what if we want some code to run after a delay or in response to something the user does?

In this chapter, we’ll look at different ways of modifying when our code is run. Programming in this way is called interactive programming. This will let us create interactive web pages that change over time and respond to actions by the user.

Delaying Code with setTimeout

Instead of having JavaScript execute a function immediately, you can tell it to execute a function after a certain ...