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JavaScript: Enhancing the DOM

Targeting node elements


From:

JavaScript: Enhancing the DOM

with Ray Villalobos

Video: Targeting node elements

In the last movie, we talked about basic access properties for node elements and the problem with traversing the DOM nodes using child nodes. Sometimes you get text elements that are just carriage returns. Some browsers support a better way of selecting elements. So, for example, you can use the property called first element child, and that gives you the first child only if it's an element. Like a tag. So, it would ignore any comment or text nodes. You can also use, of course, last element child and children.
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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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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

Targeting node elements

In the last movie, we talked about basic access properties for node elements and the problem with traversing the DOM nodes using child nodes. Sometimes you get text elements that are just carriage returns. Some browsers support a better way of selecting elements. So, for example, you can use the property called first element child, and that gives you the first child only if it's an element. Like a tag. So, it would ignore any comment or text nodes. You can also use, of course, last element child and children.

Which gives you only children that are elements. Of course, you can also use previous element sibling and next element sibling that's the equivalent of the previous sibling and next sibling. Now, before you get too excited about this, this has really lousy browser support. So, if you go to this page and you take a look at this right here, it's showing you that its available in IE 9 but not in some versions of Firefox. So, it's something good to use for newer browser support but not something you should be using if you want to be totally backwards compatible.

So, let's take a look at some of these. So, I'm in my document. I already have the consulant open. So, I'll click right here on the magnifying glass and we'll click on this element that shows me the path. And if I do my node, you can see that we have only the first list item over here. So, you can see that my node.parent node. We get the entire list. Now, if we do my node.parent node, and then try to get the child nodes of this element, we're going to get everything including every carriage return.

Now, if we do only parent node than that children, we're only going to get the children that are elements. So, it's going to ignore all these characters right here, which is pretty awesome. Of course, you could do my node parent node, and then do first child. That gives you the first text element. But if you do first element child, it will ignore the first text element and give you only this element right here. And the same way you can use my node, parent node and then last element child.

And that gives you only the last element, getting rid of any text nodes. And, of course, you can traverse through the different nodes using next element sibling and previous element sibling. Now notice that we didn't have to do anything special for parent node. And that's because a text element or a comment cannot have any children by definition. So, pairing node is always going to return an element. So, although this is a great way of selecting just elements, you need to ask yourself if you're willing to sacrifice some support in older browsers.

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