Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Practical example 1: Annotating page links

From: jQuery Essential Training

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.

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.

Show transcript

This video is part of

Image for jQuery Essential Training
jQuery Essential Training

49 video lessons · 94824 viewers

Joe Marini
Author

 
Expand all | Collapse all
  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 features in jQuery
      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

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Join now "Already a member? Log in

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed jQuery Essential Training.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Your file was successfully uploaded.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.