Start learning with our library of video tutorials taught by experts. Get started

JavaScript: Enhancing the DOM
Watching:

What is the Document Object Model (DOM)?


From:

JavaScript: Enhancing the DOM

with Ray Villalobos

Video: What is the Document Object Model (DOM)?

Before we get started we need to talk about: what the DOM is, why its important, and discuss some DOM related terminology. The DOM is and acronym for Document Object Model. Its job is to describe the structure of a HTML document and the relationship between different elements like tags, attributes, and texts on a page. As you add, delete or modify existing elements on your website, you're creating structure that a browser interprets as the DOM. So, if I go to this page and I add a new navigational element.
Expand all | Collapse all
  1. 2m 36s
    1. Welcome
      59s
    2. What you should know before watching this course
      50s
    3. Using the exercise files
      47s
  2. 24m 33s
    1. What is the Document Object Model (DOM)?
      3m 2s
    2. Navigating the DOM with developer tools
      8m 10s
    3. Testing JavaScript commands with the console
      5m 50s
    4. Communicating with the console through JavaScript
      7m 31s
  3. 31m 9s
    1. Selecting elements with getElementById
      4m 10s
    2. Choosing elements by HTML tag
      3m 20s
    3. Isolating elements by class name
      3m 12s
    4. Querying CSS to select elements
      4m 54s
    5. Working with named form elements
      3m 39s
    6. Understanding nodeType, nodeName, and nodeValue
      4m 30s
    7. Traversing up and down DOM nodes
      4m 40s
    8. Targeting node elements
      2m 44s
  4. 22m 25s
    1. Changing HTML attributes
      5m 25s
    2. Working with restricted attributes
      2m 49s
    3. Detecting data attributes
      3m 29s
    4. Controlling classes with the HTML5 classList
      3m 21s
    5. Targeting the attributes property
      1m 24s
    6. Using text content modifiers
      3m 42s
    7. Modifying elements as text
      2m 15s
  5. 14m 57s
    1. Creating and appending nodes
      4m 27s
    2. Controlling node insertions with insertBefore
      3m 17s
    3. Cloning and removing nodes
      4m 41s
    4. Replacing existing nodes
      2m 32s
  6. 26m 14s
    1. What we'll build
      2m 16s
    2. Adding a bubbling event listener
      4m 11s
    3. Creating and styling an overlay with JavaScript
      4m 39s
    4. Adding an image
      3m 48s
    5. Resizing images in the DOM
      2m 59s
    6. Centering an image
      2m 36s
    7. Handling clicks
      1m 29s
    8. Adjusting for scrolling
      1m 36s
    9. Detecting and adjusting for a window resize
      2m 40s
  7. 1m 49s
    1. Next steps
      1m 49s

Watch this entire course now—plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
Please wait...
JavaScript: Enhancing the DOM
2h 3m Intermediate Jun 10, 2013

Viewers: in countries Watching now:

The Document Object Model (DOM) is at the core of every HTML page. In order to develop dynamic HTML pages, a front-end developer needs to understand how JavaScript connects to and controls the DOM, allowing you to create, modify, delete, and edit existing page content. This course focuses on helping you understand the DOM elements, and shows the different ways JavaScript gives you access to them and makes it easier to work with the DOM. Author Ray Villalobos covers navigating the DOM, selecting elements, modifying HTML attributes, editing nodes, and much more.

Topics include:
  • What is the DOM?
  • Choosing and isolating elements
  • Traversing up and down DOM nodes
  • Changing HTML attributes
  • Modifying elements as text
  • Creating and appending nodes
  • Cloning and removing nodes
  • Adding a bubbling event listener
  • Adding and resizing images
  • Handling clicks
Subjects:
Developer Web Web Design Web Development
Software:
HTML JavaScript
Author:
Ray Villalobos

What is the Document Object Model (DOM)?

Before we get started we need to talk about: what the DOM is, why its important, and discuss some DOM related terminology. The DOM is and acronym for Document Object Model. Its job is to describe the structure of a HTML document and the relationship between different elements like tags, attributes, and texts on a page. As you add, delete or modify existing elements on your website, you're creating structure that a browser interprets as the DOM. So, if I go to this page and I add a new navigational element.

(SOUND). Then I'm adding an additional node to this page's DOM. This node has different relationships, like siblings and parents. So, the other li elements on this list are the siblings of the new node I just created. The ol tag is it's parent. The DOM is also the API that gives languages like JavaScript and CSS a way to define and modify the existing document. So, I have an article tag here with an id of main as well a headline right underneath. If I go to the CSS with this document I can access that element each 1 node and ask the browser to change it's color. The browser knows how to access this element, because it looks at the HTML I wrote, and creates a DOM tree.

Once that structure exists, it can can map the CSS I wrote and target a specific element in the page. It's really best to think of the DOM as an upside down family tree. I'm working with a really simple webpage with a traditional HTML structure plus a header, an article tag, and a footer. At the top of the family tree is the document itself. And then what we called a root element, which is normally the HTML tag. Inside that element, we have children of the html element, which is normally the head and the body tags. Inside those, we may have some additional elements.

For example, in the head section, we may have a title element, a script tag, and maybe a call to an external style sheet. Inside the body tag we may have a header, and that header can have a nav, and that nav can have a list of links. Each one of those links may have an anchor tag inside them. We could also have an article tag, with a series of headlines and paragraphs.

Every element in the DOM, including the text and attributes are considered nodes. Nodes can be both parent, and have children elements. But they can also have other relationships. Elements in the same level is known as siblings. So these h1 and paragraph tags are considered siblings. So are these li tags. Siblings are elements with the same parents. The first and last children of an element have special names called first child and last child. The rest of the children of the element are known as child nodes. Remember that browsers use your HTML code to create this DOM structure. And this is why it's really important to write clean and valid HTML. So that your CSS and JavaScript code can access and modify existing elements without any problem.

There are currently no FAQs about JavaScript: Enhancing the DOM.

Share a link to this course
Please wait... Please wait...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.
Upgrade now


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Upgrade now

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed JavaScript: Enhancing the DOM.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Welcome to the redesigned course page.

We’ve moved some things around, and now you can



Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked