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What we'll build


From:

JavaScript: Enhancing the DOM

with Ray Villalobos

Video: What we'll build

So, in the next series of movies, we're going to be building a very simple dom related project. We're going to be going to the artist page, and if you scroll down a little bit, there's a list of artwork from these artists that are in the show. If you click on it, this is going to pull an overlay which grays out the background. And then an image. This same image is going to resize vertically or horizontally, depending on its dimensions. This is a seemingly simple task, but it requires quite a bit of JavaScript to get it right. So, if we take a look at the finished version of this code. You can see that the HTML is pretty simple.
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  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

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Watch the Online Video Course 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
Software:
HTML JavaScript
Author:
Ray Villalobos

What we'll build

So, in the next series of movies, we're going to be building a very simple dom related project. We're going to be going to the artist page, and if you scroll down a little bit, there's a list of artwork from these artists that are in the show. If you click on it, this is going to pull an overlay which grays out the background. And then an image. This same image is going to resize vertically or horizontally, depending on its dimensions. This is a seemingly simple task, but it requires quite a bit of JavaScript to get it right. So, if we take a look at the finished version of this code. You can see that the HTML is pretty simple.

Scroll down here and you'll see that assisted list of images with an image tag inside each one of those list items. Now, in the JavaScript, you can see that what we're doing is selecting a specific node of this document's dom. And then adding an event listener that waits for a click inside this node. We could have added an onclick event on each of the images, but this way we can just capture an event that happens in the entire node and then ask where the target of that click is. In this case we're going to check to see that, the click has happened inside an image tag.

If it does, then we're going to create an overlay and then we're going to style the overlay with CSS. We're going to worry about the position of the overlay to make sure it centers on screen. And then we're going to add an image inside the overlay which is this part right here. Now we need to wait until the image has loaded to make sure it resizes to the accurate size of the screen. The image is too tall. And it needs to size a certain way. If it's too wide, it needs to size a different way. We'll also have to worry about centering the image on the screen.

There's a couple of other utility functions that we'll need to worry about. We'll need to make sure that we close the image if the big image is clicked on, and that we delete the events that we created, as well as remove the overlay. You see quite a bit of the things you've been learning on this course in this JavaScript. Finally, we'll worry about things like window sizing, and what happens when somebody scrolls in window. Finally, we've got a function right here, that centers the image. Although this seems like a simple task, we're going to put a lot of what we learned in this course into action.

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