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Callbacks: What to do when the animation ends


From:

jQuery for Web Designers

with Joe Chellman

Video: Callbacks: What to do when the animation ends

See animation looks pretty good. Everything's going to the right place. But it's still missing something. When the animation completes, these things are still left over. It would be nice to get rid of those as soon as the animation is done. In this movie, we're going to look at call backs which are a generalized way of dealing with events in the middle of other things you're trying to do. So looking back at the code, here is my ghost which I'm animating. So at first I have my object with all the things I want to animate. Then I show the duration.
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  1. 2m 17s
    1. Welcome
      1m 4s
    2. What you should know
      37s
    3. Using the exercise files
      36s
  2. 11m 59s
    1. jQuery is a JavaScript library?
      1m 15s
    2. When to use jQuery
      2m 51s
    3. Alternatives to jQuery
      1m 24s
    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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Watch the Online Video Course jQuery for Web Designers
1h 42m Intermediate Oct 31, 2013

Viewers: in countries Watching now:

Take the next step in your web design career with jQuery, which amplifies JavaScript's power and puts a library of prebuilt functions and a diverse selection of plugins at web designers' fingertips. This course explains what jQuery is, how to install it, and use it to script more interesting, interactive websites. Author Joe Chellman will show you how to use jQuery to add web form usability, audio and video, animation, and other features like slideshow galleries to your existing HTML and CSS-based webpages.

Check out JavaScript for Web Designers for more detailed instruction on JavaScript.

Topics include:
  • What is jQuery?
  • Installing jQuery
  • Performing multiple operations with chaining
  • Using classes
  • Adding, modifying, and removing content dynamically
  • Triggering a change with event binding
  • Creating a dynamic contact form
  • Building a slideshow gallery
  • Creating simple jQuery animations
Subject:
Web
Software:
jQuery
Author:
Joe Chellman

Callbacks: What to do when the animation ends

See animation looks pretty good. Everything's going to the right place. But it's still missing something. When the animation completes, these things are still left over. It would be nice to get rid of those as soon as the animation is done. In this movie, we're going to look at call backs which are a generalized way of dealing with events in the middle of other things you're trying to do. So looking back at the code, here is my ghost which I'm animating. So at first I have my object with all the things I want to animate. Then I show the duration.

I could plug-in an easing function here if I wanted to. In fact, let's just do that for fun. And then I can add a call back, so what is a call back exactly? A call back is a function that you call at a certain time. Different methods might offer multiple call backs or just one, and they'll fire it different times in response to different parts of the original function. So the original function in this case is animate, and it offers one place for a call back. Which is when the animation completes. So I can put in a name function here, like animation done which I could define somewhere else.

In a case like this where its just one function that I am only going to call in this place. I like to use an anonymous function, so once this function is called something is going to happen, so lets start with something simple, just log a message to the console, and say I've made it. So, this animation will run. It'll animate these properties in this amount of time, using that easing. And when it finishes, it will fire this message. And just to be clear here, you might think that if I put this same thing down here like say console.log ('Here I am') You might think that this would happen as soon as the animation completes.

But let's take a look at how it actually works in practice. I'm going to increase the length of the animation just to make this that much clearer. So I'll switch back to my browser, and open up the Javascript console, and reload. So here we go. You might be expecting one of these to come up in the console before the other. Maybe you'd expect them to appear at the same time. Let's see how it actually works. Here I am, fires immediately, and then when this flower makes it into the cart. And only then do we see the other message. So yes, this fires after the animation starts.

But if I want to do something specifically when the animation completes, I need to use a callback. So one thing that might be nice in this case. I'm going to get rid of the console. Would be to make this disappear as soon as it arrives at its destination so we just animate the fact that its going into the cart. And then when it gets there it goes away, here is how we can do that, we can use this again. So we see this up here which makes reference to this up here, this is a context dependent keyword, so here's one context where this prefers to that selected item and now down here I am using the animate method on ghost, so if I use this down here it refers to ghost.

And what I can do is call remove to remove ghost from the dawn I'll save this and now reload, click this, and there we go, it animates over there and disappears. And this will work on all of these. So, especially with animation where timing is critical. Look into the use of call backs. Animate offers a completion callback, and so do many of the other simple ones that we've looked at. So even when you're using a simple animation You can do things, specifically when the animation completes.

No sooner, no later, through the use of call backs.

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