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Using text content modifiers

From: JavaScript: Enhancing the DOM

Video: Using text content modifiers

There's a number of properties that allow you to change the content related to a node as HTML. The most common and oldest is innerHTML. It also has the most support in browsers. In newer browsers, you can also use outerHTML, which will include any tags within the current node. There's also a new function that lets you insert some additional HTML within a specified node. It's called InsertAdjacentHTML and it takes two parameters. First, a string that determines the insertion point and then the HTML. So, let's take a look at these.

Using text content modifiers

There's a number of properties that allow you to change the content related to a node as HTML. The most common and oldest is innerHTML. It also has the most support in browsers. In newer browsers, you can also use outerHTML, which will include any tags within the current node. There's also a new function that lets you insert some additional HTML within a specified node. It's called InsertAdjacentHTML and it takes two parameters. First, a string that determines the insertion point and then the HTML. So, let's take a look at these.

I want to switch over to my document, and pull up the developer tools and the console. So, I'll start by creating a variable called mynode, and then targeting a node in the DOM. Now this time, I'm going to target the text node right here that has this article. So, I'm going to hit this magnifying glass and click right here on this headline. That tells me the path to that node, which I know is going to be an article with the ID about the event. So, let me check out that node, and sure enough, I got the entire article. Notice that it has article tags.

So, if we open this up, you can see there's an H2 right here and a paragraph. So, we can get the contents of the node with the innerHTML property. So, we say mynode.innerHTML. It's going to give us everything inside that node. Notice that it's not including the article tags, just whatever is inside the article tags. It's a read and write value, so we can set it to anything we want. And you can see now, I've replaced this article with this content right here.

There's a newer property introduced by HTML 5 called outerHTML. And in browsers that support it, it also includes the tags of the element that was called. So, let me go ahead and refresh this page. And I'm going to click on the console and hit the up arrow a few times to get to my variable. And then I'll hit enter, and I know have that node again. And if I say, myNode.outerHTML, notice that includes the article tag. There's also a new function that lets you insert some additional HTML within a specified note. It's called InsertAdjacentHTML, and it takes two parameters: a string that lets it know the insertion point and then the actual HTML we want to insert. So, let me try that one.

So, we need a string right here and then something we want to insert. I'll put in a paragraph right here. The string that I put in here will be one of four values. And that will determine the position of the element within the DOM. So you can say, before begin, after begin, before end, and after end. Let's try the after end property here. You notice that it added this paragraph right here. So, if I say something like, before begin, it'll add it at the top.

So, let's try doing another one. After begin, and this time I'm going to add a word right here. Notice that it added this after the first element. And in the same way we can do before end. This time it was added before the last element. So, although these are pretty cool, it does require newer browsers. So, most of the time people stick with innerHTML.

It's by far the easiest, safest and most common way to access content within a node.

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This video is part of

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

36 video lessons · 7830 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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