July 2025
Beginner
768 pages
16h 54m
English
Content preview from PHP, MySQL, & JavaScript All-In-One For Dummies, 2nd Edition
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Chapter 2
Advanced JavaScript Coding
IN THIS CHAPTER
Understanding the DOM
Working with the DOM
Reading data from your web page
Writing to your web page
In the previous chapter, you saw the basics of how to incorporate JavaScript code into a web page. In that chapter, you ran a couple of simple JavaScript programs, using the prompt() function for input, and the alert() function for output. That was a great start, but the whole reason we’re interested in JavaScript is to use it to dynamically alter the data and/or appearance of our web pages. This chapter walks through how JavaScript interfaces with your web pages and shows you how to write JavaScript code to dynamically add, delete, or change content in your website.
The Document Object Model
For JavaScript to have access to the elements in your web page, it needs to know how to find them. The HTML Document Object Model (DOM) provides a standard way of accessing objects placed within a web page. It creates a tree structure that contains every element, attribute, content text, and even CSS3 style contained within a web page. Finding ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.