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jQuery Essential Training

Practical example 1: Annotating page links


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jQuery Essential Training

with Joe Marini

Video: Practical example 1: Annotating page links

So now, we are going to take what we have learned in jQuery so far using selectors and filters and apply our knowledge to a pretty neat practical example. So, if you go into the folder for the example files, you will see a couple of files here underneath. AutoPDFIcons and there is a start and a finished and you can go ahead and jump to the finished one if you want to, or you can follow along with me here in the start version. Let me open this up in my text editor and let me show you this file in the Design view. So, you can see here that I have got a file and inside the file is a whole bunch of links.
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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

Practical example 1: Annotating page links

So now, we are going to take what we have learned in jQuery so far using selectors and filters and apply our knowledge to a pretty neat practical example. So, if you go into the folder for the example files, you will see a couple of files here underneath. AutoPDFIcons and there is a start and a finished and you can go ahead and jump to the finished one if you want to, or you can follow along with me here in the start version. Let me open this up in my text editor and let me show you this file in the Design view. So, you can see here that I have got a file and inside the file is a whole bunch of links.

There are different kinds of links. So, if we go to the Split view, you can see what I mean. So, here is this link and it goes to an HTML file, this one here happens to be a named anchor, this one goes to another HTML, this is one goes to PDF, a couple of more HTML files, another PDF file, this one goes to a mailto link. The thing is though, if you look at the design, you can't really tell that visually. You really can't tell that Link #3 is a PDF file versus an HTML file. So, we are going to write a one line script in jQuery that automatically decorates all the links in a page with little icons that indicate that they go to PDF files rather than HTML pages.

So, what I am going to do is go into the Source view and by now you should be familiar with, including the jQuery library and here is our function that gets executed when the document loads. See, what I am going to do is I am going to write a little jQuery that says get all of the links that have attributes named href and if the href attribute ends with a .pdf string, then we want to include a little icon. So, remember ends with, for attribute filters, is the dollar sign equals and we want it to end with .pdf.

So, that query should get me all the links that end with .pdf and I am going to write a little function now. We haven't learned this in jQuery yet, we will see this in the next section. This has to do with manipulating content and creating some new content in the fly. So, what we need to do is insert an image that references the icon and remember that this query will come back with a set of objects, of all the links that match this criteria. So, for each one of those guys, I am going to say, hey! Insert into the document after each one of those instances.

So insert an image and if you look in the example files folder, you will see that there is a folder names images. So, I am going to point at the images folder and in there you will see a little file named small_pdf_icon.gif and to make it look better, we will just align it with the absolute bottom and then we will close off the image tag. Okay, so this is going to loop through all the links and it's going to find all the links that have an href that end with PDF.

So, it's going to skip over the HTML. It's going to skip over the named anchor, going to skip over the mailto and it's just going to find these guys right here. So, we are going to save that and we are going to bring it up in the browser. So, let's go out to the folder and we are going to just double-click on this folder and bring it up and you can see that when the page loads, that function gets executed and now those icons have appeared after the links that end with PDF. And we can get pretty creative with this.

We can put the links before, we can put it after. We can do whatever we want, but this is a nice practical example of using jQuery to do something really simple in the page that increases the usability. And if you go back to the code, you will see that if I add more PDF links, I will just copy and paste them in and then save it, you will notice that this behavior just automatically appears on all of the links that get added. So now, anytime, anyone adds a new link to the page that ends with PDF, it will pick up this behavior. So, let's go back to the browser and let's refresh and you can see that as those links got added, so did my little icons.

So, it's early on in the course, but already we are building some practical solutions to some very real problems using jQuery and we are going to keep right on doing that to the rest of the course.

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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