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Creating and styling an overlay with JavaScript

From: JavaScript: Enhancing the DOM

Video: Creating and styling an overlay with JavaScript

So, in this movie I want to show you how to create an overlay. We're going to use a lot of things that we already used in previous movies. So, first off, I'll remove this console lock command. And what I want to do is create a variable and call it myoverlay. And in here I want to create a new element. So, I'm going to use the Create Element method. And create a new div in our document. So, just so that it's easier to target, I want to make this overlay have an id of overlay. I can do that by just using the dot notation and pass an empty attribute.

Creating and styling an overlay with JavaScript

So, in this movie I want to show you how to create an overlay. We're going to use a lot of things that we already used in previous movies. So, first off, I'll remove this console lock command. And what I want to do is create a variable and call it myoverlay. And in here I want to create a new element. So, I'm going to use the Create Element method. And create a new div in our document. So, just so that it's easier to target, I want to make this overlay have an id of overlay. I can do that by just using the dot notation and pass an empty attribute.

In this case the id that I want to change and then I want to add this to the current document so, I'll just add it to the body tag and use the Append Child method. And pass along my overlay so, what this'll do is once you click on an image its going to add this overlay to the end of the bodytag, so let's go ahead and go into our code. So, here we are in the artist page. And I'm going to scroll down and click on one of these items. It doesn't look like anything happened but I am going to break into the console and I will go into the Elements tab and notice that its showing the overlay right now.

So, let me refresh the page and show you that, it's not there right now but if I click on one of these images. It'll appear right here. That's pretty cool, it doesn't look like anything yet, so we need to go back in here and add some styles to that. So, I'm going to set up the overlay styles. So, I could obviously add some CSS to my stylesheet, that automatically takes care of that overlay. But, this is a course on JavaScript, so I'm going to show you how to style everything in JavaScript. First I'll set the position of this element.

So, my overlay.style, cause we'll be working with style sheets and then we'll change the position property of the styles to be absolute. Okay finally we'll modify the top property to be zero to begin with. And then I'll make this overlay have a background color. Now notice that whenever I do an attribute that normally would have a hyphen in CSS I need to camel case it. So, the b right here is lowercase and the C is uppercase. So, I'm going to create a background color and that's going to be equal to a rgba color because I want it to be partially transparent. And that can be just black plus 70% of the color, so that's going to be 70% black.

And then, I'm going to create the style of the cursor, to be a pointer. That'll be nice, so that when somebody clicks on this, it'll get the pointer. And they'll know that when they click on the image that we're going to insert here later, they can go back into the regular page. Alright, now we need to position this properly. So, I'm going to say re-size and position overlay and I'll start by modifying the width of my overlay. That's going to be equal to window inner width plus since this is CSS we have to include a measurement system here so that's going to be pixels. Alright so next I'll do the same thing my overlay style and then adjust the height. Be equal to the window, enter height plus the pixels. So, see that's working I am going to save this go back into my project refresh and I will click on one of these images.

Now notice that the overlay is working but is sitting at the very top. If I scroll all the way to top I can see it and that's not really what we want. We want it to follow along with the position of the window. So, we go back into the code and we need to add a couple of lines here, myoverlay.styletop is going to be equal to the window. And then page Y offset will be the offset from the top, plus the pixels and then same thing for the overlay style Left window.page X offset.

In this you got to be careful here about capitalizing properly, make sure this is a lower case right here. Now we got the adjustments for this scroll, we save this and go into our page on refresh, and when I click on these, notice that it's the proper height.

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This video is part of

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

36 video lessons · 7640 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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