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Performing multiple operations on the same line with chaining

From: jQuery for Web Designers

Video: Performing multiple operations on the same line with chaining

In this movie we're going to look at chaining, which is a way of writing your Query. That's something you'll see all the time in other people's code and something that you will, no doubt, use a lot in your own as well. So, we're looking at this page from the Hansel and Petal website. This the build a bouquet page. If I reload it you can see nothing is happening when I first load the page. I'm looking at the file over here. This is the very bottom of the file where the script tags are, and I have some code here commented out, so it doesn't actually do anything. I have my jQuery ready, but it doesn't do anything, because all of this is commented out.

Performing multiple operations on the same line with chaining

In this movie we're going to look at chaining, which is a way of writing your Query. That's something you'll see all the time in other people's code and something that you will, no doubt, use a lot in your own as well. So, we're looking at this page from the Hansel and Petal website. This the build a bouquet page. If I reload it you can see nothing is happening when I first load the page. I'm looking at the file over here. This is the very bottom of the file where the script tags are, and I have some code here commented out, so it doesn't actually do anything. I have my jQuery ready, but it doesn't do anything, because all of this is commented out.

So let's remove those comments. This code will actually do something when the page loads. I'm going to save this, come back over here and reload. You can see the jQuery is doing some stuff to these elements. So let's look back at the code and kind of take it apart and see what's happening here. And then we'll talk about how to rewrite this using chaining so it's not so verbose. So, what I'm doing here is grabbing, using an ID selector, the grid. Which is a container for all of these list elements. And I'm using Find to grab all of the list elements from inside that grid. And then I'm doing some operations to it.

First time setting the background color, using CSS. I'm animating the width over two seconds, making it shrink by 100 pixels. Fading it out, and then doing a slow fade in. Let's watch that one more time with that in mind. So everything gets smaller, fade out and fade in. Okay, now we're doing this on separate lines saying the same thing over and over again. It's a little repetitive, not that great. So jQuery chaining allows us to rewrite this in a way that's a little nicer. A little more succinct. So, what we do, is instead of using this same variable over and over again we can just attach each action in sequence, separating them with the dots, like this.

So I'm going to save again, come back over here and reload. As you can see it still works. So what this all means, is that each of these is a method In the jQuery object. And so every time I do one of these actions, jQuery returns the resulting object with those changes applied. So, first I do the Find, and then I can take that and apply the css to it. And then I can take that and apply the animation to it. And then I can take that and fade it out, and fade it back in. So this is all on one line now which is more succinct but it's not that all readable. So here's another thing you can do. To make this easier to read, you can break these across separate lines, like this, you're ending it with a semicolon and so you start out with your grid, that you selected up here, and taking each of these actions in sequence.

No matter how you write it, you're still using chaining either way. And as I say, this is something you'll see all the time in other people's jQuery, if you're learning from other people's examples, and of course you'll be writing it this way a lot yourself in your own code.

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This video is part of

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jQuery for Web Designers

37 video lessons · 12945 viewers

Joe Chellman
Author

 
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  1. 2m 17s
    1. Welcome
      1m 4s
    2. What you should know
      37s
    3. Using the exercise files
      36s
  2. 12m 0s
    1. jQuery is a JavaScript library?
      1m 15s
    2. When to use jQuery
      2m 51s
    3. Alternatives to jQuery
      1m 25s
    4. Which version of jQuery to use
      1m 50s
    5. How to install jQuery
      3m 21s
    6. Reference materials
      1m 18s
  3. 19m 19s
    1. Getting ready
      2m 26s
    2. Selecting elements to use
      3m 54s
    3. Performing multiple operations on the same line with chaining
      2m 30s
    4. Using classes to find what you're looking for
      3m 52s
    5. Adding, modifying, and removing content dynamically
      4m 3s
    6. Challenge: Form feedback
      1m 12s
    7. Solution: Form feedback
      1m 22s
  4. 18m 28s
    1. Triggering a change based on activity with event binding
      4m 37s
    2. Reading and changing values
      4m 17s
    3. Working with HTML attributes
      4m 55s
    4. Challenge: Dynamic contact form
      1m 27s
    5. Solution: Dynamic contact form
      3m 12s
  5. 16m 42s
    1. Using the Colorbox plugin to build a slideshow gallery
      4m 22s
    2. Implementing Colorbox on your site
      2m 46s
    3. Changing Colorbox options
      5m 53s
    4. Challenge: Convert to a slideshow
      1m 6s
    5. Solution: Convert to a slideshow
      2m 35s
  6. 28m 37s
    1. Using jQuery or CSS to animate elements
      2m 24s
    2. Creating simple jQuery animations
      4m 35s
    3. Animating numeric properties with animate()
      4m 56s
    4. Understanding animation easing
      4m 4s
    5. Putting it together: Flowers in the cart
      6m 4s
    6. Callbacks: What to do when the animation ends
      3m 27s
    7. Challenge: Improve the animation
      1m 3s
    8. Solution: Improve the animation
      2m 4s
  7. 4m 45s
    1. More fun plugins
      2m 38s
    2. What's next: More jQuery
      50s
    3. What's next: More JavaScript
      1m 17s

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