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JavaScript: Enhancing the DOM
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Adding a bubbling event listener


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JavaScript: Enhancing the DOM

with Ray Villalobos

Video: Adding a bubbling event listener

So let's go ahead and work on this project. Right now I'm on the artist's page of this website. And what I want to do is target this section right here with the art from each artist. I need to make sure that I create a node that targets this area right here. And then add a listener for that node that checks for a click. If one of these images is clicked then we're going to execute some code. So I'm going to switch over to my code and show you that this is a very simple list right here, that has image text inside each list item.
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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

Adding a bubbling event listener

So let's go ahead and work on this project. Right now I'm on the artist's page of this website. And what I want to do is target this section right here with the art from each artist. I need to make sure that I create a node that targets this area right here. And then add a listener for that node that checks for a click. If one of these images is clicked then we're going to execute some code. So I'm going to switch over to my code and show you that this is a very simple list right here, that has image text inside each list item.

So right now my java script code is completely empty. First I will start off by creating a sell executing function. So just protect any of our local variables from anything else running in our page. So start by creating a variable called myNode and then I'm going to set it to document.querySelector and I'm going to target a section in my page. Now what do I need to target? Let's go back into this page and pull up the console and what I want to do is target this section. So, to find out where that is, I'm going to click on the magnifying glass and click on one of these items.

This shows you the breadcrumbs down here and what I want to pay attention to is the fact that I have an article with an ID of artlist. Inside that I have a div with a class of pixgrid. And inside that I have an on ordered list. That's really what I want to target. So, let me switch back here and target the artlist and then target the pixgrid and the on ordered list within that So once I have that node, I can add an event listener to it.

So I'll save my node, in at event listener, and I want to check for a click event when it happens in that node. So once that click happens I want to execute a function. That function is going to pass along an event. And I want to make sure that I pass this value of false right here. This makes sure that the event is bubbling properly. Bubbling just refers to the fact, that I want to target things within this on order list, and not target things outside it.

So for right now I'm just going to go ahead and log to the console our event. Just so we can see what's happening. So let me go ahead and save that switch over to my code back to the console and I'll refresh the page. And I'll click somewhere inside here notice that no matter where I click its going to log the event of the console. Now, if you look right here you can see where I'm clicking. So if I click somewhere kind of in the middle its going to say that I clicked on the list item if I click. In one of these photos is going to show a click in the image. I want to target only the clicks in the image.

So if I open this right here you can see there's a bunch of properties. The one that I'm interested in is the target property right here, which is there. If I open that up, I can see a lot of different things in here. But, I can choose one that's down here called tag name. So I can check for this property called tag name. And if that property happens to be image, then I can execute my function. So let me go ahead and switch over back to my code and fix this to check to see if the target, so e the event, target of the event happens to have a tagName of IMG.

Then, I want to perform a set of tasks. (SOUND) For right now, I'm just going to output it to the console. So I'll paste that in here, save it, and come back into my page. Refresh, and this time I'll click on this image. You could see that the event fired. But if I click right here, it's not going to fire an event. So it's only firing an event if I click on an image inside this unordered list. So you can see that by creating a node we can be very specific by only targeting things within that node.

So in this case I check for the tag name of IMG. And now we're ready to handle our overlay.

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