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

Using miscellaneous event features

From: jQuery Essential Training

Video: Using miscellaneous event features

The last series of event functions we are going to cover for jQuery are some miscellaneous event functions. And these are basically provided by jQuery to handle a couple of specialized tasks. Those functions are the one() function, and trigger(), and triggerHandler(). The one() function pretty much works the same as bind(). However, the event handler is only ever going to be executed once for each one of the matched elements that the event is bound to. And you call this function when you only want an event handler to happen once.

Using miscellaneous event features

The last series of event functions we are going to cover for jQuery are some miscellaneous event functions. And these are basically provided by jQuery to handle a couple of specialized tasks. Those functions are the one() function, and trigger(), and triggerHandler(). The one() function pretty much works the same as bind(). However, the event handler is only ever going to be executed once for each one of the matched elements that the event is bound to. And you call this function when you only want an event handler to happen once.

So, the event will be bound, and then once the event gets triggered, it will not be responded to again. The other two functions, trigger() and triggerHandler(), are ways of essentially triggering events from within code without having to wait for the user. The difference here is that the trigger () function will trigger an event on each one of the matched elements that come back from this selector. And it will also cause the browser to act as though the user caused the event to happen.

So, for example if you trigger the click event on a link, then not only will the event fire off from within your code, but the browser will act as though the item were clicked on. Now, triggerHandler() is similar. It does the same thing. It triggers the event handlers but it does it without having the browser go off, and act as though the event actually happened. This only works on the first matched element in the result set for a selector. So, what we're going to do now is take a look at some examples of how we might use this.

We're not going to use the trigger() or triggerHandler(). Those are pretty esoteric. So, let's take a look at how the one() event handler works. Let's jump over to the code. So, here's the source code. Just take a look at the Design really quick. So what I have here is a series of divs, and each one has a color and a border. What we're going to do is write some code that binds event handlers to these divs that only fire once. So, let's go back to the Source. So, you can see that for each one of these divs, I've defined a style sheet.

And among other things it defines things like width and height and you can see that there is a cursor property here in the style sheet that's set to a pointer indicating it could be clicked on. So, what we're going to do is create an event handler that only fires the click() function once. So, let's go up here where I've got my jQuery library included. So, I'm going to write my onload handler. So, I will write function, and when the document loads, what we're going to do is get a reference to all these divs, and instead of using the bind() function we're going to use one().

What we're going to do is bind an event for click. And we'll have a function that gets called. So, inside this function we're going to set on the this operator. Remember, inside-- since the click event is happening on a div, when this handler function gets called, the this parameter will refer to the div that got clicked on. So, we're going to set the css for the div that got clicked on.

The css we're going to set will be, we'll change the background to red and change the cursor to auto. so it's going to get rid of the pointer. And that should be all we need to do. So, now we're going to switch over to the browser and see if this works. So, I'm just going to double- click on this, bring up the browser. So you can see that as I'm mousing over this the little pointing cursor.

So I click on it once, it changes to red. You can see that the pointer went away, and if I click on it nothing happens anymore. So this is basically how you assign event handlers that only happen one time. So, let's just make sure that this works cross browser. I'm going to open this up with Firefox. Okay, and exactly the same behavior. You can see that now the event handler is only happening one time. So now that we've seen how to work with events, let's try and build a practical example and that's the subject of the next lesson.

Show transcript

This video is part of

Image for jQuery Essential Training
jQuery Essential Training

49 video lessons · 95581 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.