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Detecting and adjusting for a window resize

From: JavaScript: Enhancing the DOM

Video: Detecting and adjusting for a window resize

This project is working and looking great. But there's a slight problem that we need to take care of. If you resize this window for any reason and then I'm going to click on one of these, it looks great. But if I resize my window now, you can see that it doesn't look good because the overlay doesn't stretch to the whole width of the window. So we need to go ahead and fix that. I'm going to go enter my code and, right over here, I'm going to add a listener for another window event. So this time, the event that I want to look for is called resize and, of course, like before, I want to execute a function and pass it along false to make sure that it bubbles properly.

Detecting and adjusting for a window resize

This project is working and looking great. But there's a slight problem that we need to take care of. If you resize this window for any reason and then I'm going to click on one of these, it looks great. But if I resize my window now, you can see that it doesn't look good because the overlay doesn't stretch to the whole width of the window. So we need to go ahead and fix that. I'm going to go enter my code and, right over here, I'm going to add a listener for another window event. So this time, the event that I want to look for is called resize and, of course, like before, I want to execute a function and pass it along false to make sure that it bubbles properly.

Once again, we're going to make sure that the overlay exists. And if it does, we need to adjust this. So, my overlay style, we're going to change the style attributes width and we're going to make that to the window inner width plus the pixel measurement. (SOUND) We're going to do a similar thing with the height. (SOUND) Of course, it's going to be inner height. (SOUND) And we also need to adjust the position of the top and left of the overlay. (SOUND) So, I'm going to save this. And I'll go back into my project.

I'll refresh. I'm going to make my window smaller again. And I'll pull up one of these images, resize my window. And the overlay looks really good but the image is not centered. So let me go back here and just execute the center image function and pass it along to large image. So now, I'm going to make my window smaller again and I'll refresh click on this and as I re-size the window, the image will be centred. One more thing that I want to clean up is when I remove the 'overlay' I want to make sure that the window is no longer listening for the events that I have just created.

So, I'll add a 'window, removeEventListener' here and pass it along the event that I want to remove. Which will be re-size, window, and false, because of the way the event bubbles, and do the same thing to get rid of the event that the text for scroll. This is just a clean-up function, it's going to work either way but, it's safer to do things properly. So I'll save, refresh, re-size the window, and try it out once again.

Everything's working well. Click on this, and it goes away. And now our project is finished. So hopefully you got a chance to practice a lot of the things that you learned in this course. Enhancing the DOM is all about understanding how the DOM nodes work, so you can access them, remove them, and create events around the nodes that you have in your DOM.

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Image for JavaScript: Enhancing the DOM
JavaScript: Enhancing the DOM

36 video lessons · 7578 viewers

Ray Villalobos
Author

 
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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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