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jQuery Essential Training

Creating custom animations


From:

jQuery Essential Training

with Joe Marini

Video: Creating custom animations

In addition to the pre-built animation functions that jQuery gives you, there is a basic Animate function that you can use to create custom animation for a wide variety of properties on page elements. So to do that, you simply call the Animate function and there are a couple of different versions you can see there on the table. One takes a series of parameters and those are the properties on the element that you want to animate. There is a Duration parameter and that's the number of milliseconds that the animation should take.
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  1. 2m 52s
    1. Welcome
      1m 9s
    2. Using the exercise files
      1m 43s
  2. 17m 37s
    1. What is jQuery?
      5m 19s
    2. Downloading and installing jQuery
      2m 20s
    3. Creating a simple jQuery-enabled page
      7m 12s
    4. Overview of jQuery's features
      2m 46s
  3. 59m 57s
    1. Overview of selectors and filters
      2m 9s
    2. Using basic jQuery selectors
      9m 6s
    3. Using basic jQuery filters
      8m 35s
    4. Using jQuery attribute filters
      6m 7s
    5. Child, visibility, and content filters
      9m 59s
    6. Form selectors and filters
      9m 3s
    7. Traversing documents
      9m 1s
    8. Understanding jQuery statement chaining
      1m 42s
    9. Practical example 1: Annotating page links
      4m 15s
  4. 47m 16s
    1. Creating, getting, and setting content
      5m 53s
    2. Manipulating attributes
      5m 43s
    3. Inserting content
      4m 57s
    4. Wrapping, replacing, and removing content
      5m 27s
    5. Working with CSS
      6m 19s
    6. Associating data with page elements
      9m 30s
    7. Practical example 2: Automatic TOC generator
      9m 27s
  5. 33m 6s
    1. Understanding the jQuery event handling features
      2m 4s
    2. Binding and unbinding events
      6m 23s
    3. Convenient event helper methods
      4m 40s
    4. Using the jQuery event object
      6m 21s
    5. Using miscellaneous event features
      4m 38s
    6. Practical example 3: Table striping and highlighting
      9m 0s
  6. 28m 45s
    1. Hiding and showing elements
      5m 23s
    2. Fading elements in and out
      4m 2s
    3. Sliding elements
      4m 3s
    4. Creating custom animations
      5m 58s
    5. Practical example 4: Image rotator
      9m 19s
  7. 25m 30s
    1. Introduction to jQuery UI
      3m 40s
    2. Exploring the jQuery UI widgets
      5m 24s
    3. Exploring the jQuery UI effects
      3m 58s
    4. Using the jQuery UI ThemeRoller
      4m 11s
    5. Downloading and installing jQuery UI
      8m 17s
  8. 47m 49s
    1. Overview of the sample web site
      3m 50s
    2. Using the accordion widget
      9m 14s
    3. Creating an image rotator
      10m 22s
    4. Building hover tooltips
      7m 26s
    5. Making an image selector
      9m 30s
    6. Using the Resizable effect
      7m 27s
  9. 30m 2s
    1. Working with Asynchronous JavaScript and XML (AJAX)
      10m 8s
    2. Using AJAX helpers
      4m 34s
    3. Understanding AJAX data types
      10m 14s
    4. Using global AJAX event handlers
      5m 6s
  10. 20s
    1. Goodbye
      20s

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jQuery Essential Training
4h 53m Beginner Sep 01, 2009 Updated May 24, 2013

Viewers: in countries Watching now:

In jQuery Essential Training, Microsoft professional Joe Marini presents the power of the jQuery library, an open-source JavaScript project that greatly simplifies the process of adding advanced functionality to web sites. Joe teaches how to use these new features to build pages that work across browsers with the functionality that today's users (and clients) are looking for, from complex animation effects to dynamic page formatting. Joe pulls all of this together, showing how the jQuery UI plug-in can expand and streamline the capability of jQuery, and then integrating jQuery design tools into a complete sample web site. Exercise files accompany the course.

Topics include:
  • Constructing jQuery selectors and filters to gather information from web pages
  • Creating, inserting, and manipulating web page content
  • Understanding jQuery statement chaining
  • Building event handlers that work across browsers
  • Working with jQuery effects, such as showing, hiding, and fading page elements
  • Creating custom animations with specialized properties and options
  • Using the jQuery UI plug-in to give pages a polished look
Subjects:
Developer Mobile Apps Web Mobile Web Web Development
Software:
Ajax jQuery jQuery Mobile
Author:
Joe Marini

Creating custom animations

In addition to the pre-built animation functions that jQuery gives you, there is a basic Animate function that you can use to create custom animation for a wide variety of properties on page elements. So to do that, you simply call the Animate function and there are a couple of different versions you can see there on the table. One takes a series of parameters and those are the properties on the element that you want to animate. There is a Duration parameter and that's the number of milliseconds that the animation should take.

The Easing parameter is the type of easing function to use and there are only two built-in. There are plug-ins that do more, but right now jQuery has Linear or Swing built-in. Finally, there is Call Back option and the Call Back is the function that will be called when the animation is completed and that of course is optional. There is also another more complex animate function here and it's same idea, these are the properties you want to animate and the options are a set of options set in an object notation style for the animation that you want to have happen.

There is also a Stop function and the Stop function basically stops all the running animations on all of the specified elements. So you would have some jQuery selector that will produce a result set, and then you would call Stop on all those guys to stop them from animating if they are. So let's take a look at how to use the animate function. I am going to jump over to the code and we can see how it works. You will see that there is a div on the page with some text in it.

So let's try some custom animations. The first animation is when we click the Grow Right, you will see that the side of the div grows out to the right. If we click the Big Text, you will see that the text animates up in size. If we click Move Div, you will see that it animates over to the right. So let's refresh, and let's see if it works in Firefox as well. So I am going to bring this up in Firefox. There it is. So I am going to click Move, I am going to click Big Text, and I am going to click Grow Right, and you can see that it worked.

Now, let's refresh. Now let's go over to the code and see how we accomplish this. I am going to bring this up in my Editor. Down here are the buttons that control the animation. Here is the Style Sheet on the div, and that's the div that we are animating right there. Up here, you can see that what's happening is we are calling various versions of the Animate function with parameters that we want to have animated.

So the way this works is I get a reference to the element or elements that I want to animate. And in this case, it's just one, but again, I can have a result set that comes back. I call the Animate function with an object. Inside the object, I list the properties that I want to have animated. So sin this example for the width, I am setting a Width property on the object for the parameters I am passing in, and I want that to happen over the course of one second.

So in this case you can see I have got the different Animate functions controlling different properties. So this is the one for the width, this is the one that animates the font size, this is the one that animates the left side property, which is what makes it move over. However, since we are specifying things as objects, I can have multiple of these animations appear all at once. So let's copy this function here, and let's make a new button called Multiple. So that's going to be its ID.

I am going to go down here and I am just going to copy this guy, and name it Multiple, and we will label the button Everything. So when the Everything button gets clicked, let's animate everything. So we will animate the width. We will copy that and we will paste that in here. Let's animate the font size and we'll copy that and we will paste that in here.

You notice also that I am passing in a parameter for the Easing function. I am passing in Swing, which is kind of like a Smoothing function that makes the animation appear bit more natural. But I could also pass in Linear if I wanted to for this parameter, and we will see what effect that has. So now, instead of animating just one thing at a time, I have got a parameters object that will animate all of those properties over the course of one second. So let's save and let's go back out to the browser. So now, I am going to refresh.

So now when I refresh, you see that the Everything button is there. So now when I click the Everything button, you can see that everything happens all at once. The font size is animated up, the div got bigger, and it moved over to the right-hand side, because I animated the left. Let's switch over to Firefox. So I am going to refresh here as well. There is my Everything button. When I click on Everything, you can see that everything happens all at the same time. You can see that using the Animate function, you can create some pretty complex animations just by specifying the parameters that you want to animate from and animate to.

So the default, let's go back to the code really quick. When I specify these parameters like Width, 500, this is going to be the ending result. This is what the property will look like when the animation is complete. The starting value is whatever the Style Sheet sets it to. So you can see here that the Width starts out at 250, and it's going to end up at 500, and similarly, for the rest of the properties as well. So that's how you use the Animate function. We are at the point now where we can build a practical example.

Find answers to the most frequently asked questions about jQuery Essential Training.


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Q: When attempting to download jQuery, as the author does in the movie “Downloading and installing jQuery,” the file does not download. When any of the links on the download page are clicked, the browser opens a page of code instead.
A: This sometimes happens when a web browser doesn't have the proper MIME type to prompt the user to download the file instead of open it directly. Therefore, the browser is opening the code instead of downloading it. If this occurs, download the file on a by Control-clicking (Mac) or right-clicking (Windows) on the download link and choosing the Save File option, which will download it to the computer.
Q: Why do some of the examples use the form $("document") instead of just $(document)?
A: jQuery's $(document).ready() function will work with either form. As a reminder, you can also just use the $() shorthand to accomplish the same thing:
 
$(function() {
// code to run when the document is ready
});
Q: I am stuck on the first exercise in Chapter 1, video 3 "Creating a simple jQuery enabled page".

Your example javascript code, both in the movie and in the exercise files,
reads as follows:

<script type="text/javascript">
$("document").ready(function() {
alert("The page just loaded!");
});
</script>

This is not working for me.
A: After jQuery 1.3.2, a change was made where quotes were no
longer needed around the "document" argument to the jQuery $() function.

Type the following instead.

<script type="text/javascript">
$(document).ready(function() {
alert("The page just loaded!");
});
</script>
Q: How do I remove the resize handle that appears on on <textarea> elements in some browsers, such as Firefox and Chrome?
A: Some browsers automatically provide this feature for these text elements. You can disable this feature using CSS by providing a style rule for the element that specifies no resize behavior. Add the rule "resize: none;" to a stylesheet that is applied to the textarea, and the resize handle will not appear.

Q: This course was updated on 5/24/2013. What changed?

A: This update includes a new chapter on the jQuery AJAX features, new movies on associating data with page elements, and updates to the chapters on events and the jQuery UI plugin to reflect changes in JQuery 1.8.
Q: In Chapter 7, for the "Using the Resizable effect" movie, the example code from the Groundswell_Final and Groundswell_Start folders isn't limiting the width of the window. What should I do?
A: There's a bug in the example file. You need to add: 
textarea { resize:none;}

to the main.css file in the _css folder, and change the link tag in register.htm from:

<link href="../_css/sunny/jquery-ui-1.7.2.custom.css" rel="stylesheet" type="text/css" media="screen, projection" />

to

<link href="../_css/sunny/jquery-ui-1.10.2.custom.css" rel="stylesheet" type="text/css" media="screen, projection" />

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