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jQuery Essential Training

Using the accordion widget


From:

jQuery Essential Training

with Joe Marini

Video: Using the accordion widget

Let's begin by adding the accordion control to the index page of our website. So, what I am going to do is open the index page in my Editor. Let's scroll down to the Latest News section and that's this guy right here. So let's find that in the source code. Recall the accordion control needs to have a single container that it uses to encapsulate all of the content tabs for its content.
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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

Using the accordion widget

Let's begin by adding the accordion control to the index page of our website. So, what I am going to do is open the index page in my Editor. Let's scroll down to the Latest News section and that's this guy right here. So let's find that in the source code. Recall the accordion control needs to have a single container that it uses to encapsulate all of the content tabs for its content.

So, what I am going to do first is wrap the contents of the News section inside a div. This now gives us one container to point the accordion control at and say yeah, this is what you need to use as your container. So I am going to give it an id and the id is what we are going use to identify it as the accordion control and I am going to give it an id of newsSection. Now that I have created div, I am going to take the other part of it, and scroll down to the end of the newsSection and put it in right there.

That's the first thing I need to do. So, now I have wrapped in a div. Now, include the jQuery library and its associated jQuery UI library. So, we are going to go back up to the head section, and let's quickly just look at the folder structure. So, here in the folder, let's look in scripts and you can see that there is jQuery and I am also using the minified version of jQuery ui. So, these are the production version script files that I have downloaded from the site.

So, let's go back into the code. So, a couple of things that you need to do first. First, I am going to include a script and that's going to be the jQuery file. So, that is located in the scripts folder and recall in the scripts folder, I am using the minified version of the jQuery library. So, all I need to do is name it correctly. That's jquery-1.3.2.min.js, and that's all I need to do there.

So, now I need to include the script for jQuery ui as well. So, that's also script of type text/ javascript and that one is located in scripts folder too, scripts and that is jquery-ui-1.7.2.custom.min.js. So, now I have included my scripts and I need to include the link to jQuery ui style sheet as well.

Just remember when we rolled up that theme and downloaded it, we need to include that. So, it's going to copy this link and type in a reference to the style sheet. Let's makes sure we have the name correct so let's pop-out to the folder and let's look in the CSS part and that's the sunny theme and it's jquery-ui-1.7.2.custom.css Okay, so that is in css/sunny and it is the jquery-ui-1.7.2.custom.css.

So, now it's time to write the script that's going to create the accordion control. So, I am just going to type script type is text/javascript. We want this to happen when the document loads. I am going to type a little jQuery code here. Since I want this to happen on the document load. Throughout the course, what I have been doing is writing a document ready event, right. I've been doing something that looks like this and that's all fine and good. There's actually a shortcut, however, that you can use for the document ready event and that is just to simply pass a function to the jQuery object.

So, I am just going to write a dollar sign and then brace and then function. And this is the function that's going to be called when the document loads. And all I need to do is tell jQuery to get me the newsSection item, remember that's the div that we created, and then all I need to do is type accordion. Remember, however, that the accordion control by default looks for link tags as its header and paragraph as its content.

We need to make a little fix there because you see these are h4. These are not links. The paragraphs are fine, but these are h4 tags. So, let's scroll back up and type in that little option here, because the accordion control gives us the option of what to specify as the header. So I will pass in an object that says that the header is an h4 and that should fix it. So, now we are ready to test out the page, and make sure that that's working. So, let's do that. Let's go to the browser. I am going to just click on index.htm, bring it up, and let's scroll down.

And you can see that the accordion control is there but something is off. So, we had to fix the CSS Style Sheet, and this is a common issue that you will run into when you are updating your existing site. You can see that the control works, but the CSS is clearly off. We got to go and fix that. So let's go make some changes to our CSS codes so that the title looks okay and everything is all nice and cleaned up. So, we will switch back to the code. So, let's go into our CSS file and fix this.

Here is our CSS file. So, there's a couple of quick changes we need to make to the CSS code. What we are going to do is define a couple of style sheets for our content. So, let's scroll down to where the main content is. Here is the main content section and in the main content section, we are going to define a couple of style sheets that are particular to our page to make the h4s work correctly. So what we will do is we will say #mainContent. We are going to create a style sheet here for h4, and the span.subhead inside the h4 because that, if we look back at the source code, and we scroll down to the newsSection, you can see that there is some spans in here and we need to fix some offsets that the accordion control is not liking.

So, what we are going to do is inside the subhead span, we are going to define a margin-left of 20 pixels, so that everything is offset from the left-hand side of the page. Then we are going to create a style sheet for the news section itself and we will call that newsSection and inside the newsSection, we are going to assign a margin-left of 20 pixels.

And for the newsSection's h4 and the newsSection paragraph tags, we are going to define the margin-left to be 0, and the margin-bottom to be 0. In fact, actually this probably needs more like 40 pixels. So, now let's go back and see what changes that has made.

So, we are going to go back to the browser and we are going to refresh and you can see that that's pretty much cleaned everything up. So, what I have done is I have gone through and it looks like one little guy did not make it in. Let's go back to it and see why that is. Let's see. It looks like this guy is missing a span. So, we need to copy that span right there, we will put that span around him, and go back and we will go back and refresh and now everything is fixed.

So, now you can see that the text fits just fine and the accordion control is working. So, that's pretty much all we needed to do to get the accordion control integrated into the page and you will find if you have existing sites, you may need to mess around with your CSS a little bit to get it to accommodate the CSS that the controls we are going to use. In that case, it's pretty much as an exercise in figuring out why the elements are positioned wrong. And usually just by tracing through the CSS you can almost immediately find out what's going on or you can use whatever built-in browser tools you have in browsers like Firefox and IE now provide tools for looking at what CSS is being calculated for given elements.

So, we have pretty much built the accordion control and it's working. Let's make sure that it works in Firefox as well. Let's go back out to the folder. Here we are in the folder, let's open this up with Firefox and you can see here, yeah, it's working just fine. It is the same accordion control, same page, same behavior.

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


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Please wait...
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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