We can traverse the DOM with various properties.
JavaScript is partly an object-oriented language.
To learn JavaScript, we got to learn the object-oriented parts of JavaScript.
In this article, we’ll look at the DOM.
We can access DOM nodes with built-in objects in the browser.
The document
node gives us access to the current document.
We can see the properties of it with the console.dir
method:
console.dir(document);
We can use the nodeType
property to get the type of node.
ndoeName
has the node’s name.
nodeValue
has the value, which is the text for text nodes for example.
The:
document.nodeType;
returns 9.
There’re 12 node types, which are represented by integers.
The most common is 1 for element, 2 attributes, and 3 for text.
document.nodeName
returns '#document'
.
And document.nodeValue
is null
.
The document.documentElement
property gives us the HTML element.
The nodeType
is 1 since it’s an element.
We can see that with:
document.documentElement.nodeType
We can get the nodeName
with:
document.documentElement.nodeName
and get the tag name with:
document.documentElement.tagName
They both return 'HTML'
.
Exercise from Eloquent JavaScript. Today, we will write a function that forms a chessboard. You can find the exercise in the Eloquent Javascript book (3rd edition, chapter 2; Program Structure). Write a program that creates a string that represents an 8×8 grid, using newline characters to separate lines. At each position of the grid there is either a space or a “#” character. The characters should form a chessboard.
One of the nice things about learning JavaScript these days is that there is a plethora of choices for writing and running JavaScript code. In this article, I’m going to describe a few of these environments and show you the environment I’ll be using in this series of articles.
To paraphrase the title of an old computer science textbook, “Algorithms + Data = Programs.” The first step in learning a programming language such as JavaScript is to learn what types of data the language can work with. The second step is to learn how to store that data in variables. In this article I’ll discuss the different types of data you can work with in a JavaScript program and how to create and use variables to store and manipulate that data.
Professor JavaScript is a JavaScript online learning courses YouTube Channel. Students can learn how to develop codes with JavaScript from basic to advanced levels through the online courses in this YouTube channel.
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