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jQuery Essential Training
Illustration by Don Barnett
Watching:

What is jQuery?


From:

jQuery Essential Training

with Joe Marini

Video: What is jQuery?

Okay so, if you are ready as I am to write less and do more, then let's just dive right in and get started with jQuery Essential Training. Let's start by talking about what jQuery is. jQuery is a freely available Open Source JavaScript Library and its purpose in life is essentially to simplify the task of creating modern web pages that are highly interactive and responsive, essentially full of all the Web 2.0 goodness that you see all over the internet today.
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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 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

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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 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 Web Web Design Web Development
Software:
jQuery
Author:
Joe Marini

What is jQuery?

Okay so, if you are ready as I am to write less and do more, then let's just dive right in and get started with jQuery Essential Training. Let's start by talking about what jQuery is. jQuery is a freely available Open Source JavaScript Library and its purpose in life is essentially to simplify the task of creating modern web pages that are highly interactive and responsive, essentially full of all the Web 2.0 goodness that you see all over the internet today.

It works across all the modern browsers. One of the great things about jQuery is that it abstracts away a lot of the browser-specific features, which allows you to concentrate on the design and finished result that you are trying to achieve rather than spending all your time trying to figure out how to achieve various effects and features within individuals browsers. So jQuery focuses on doing a few things very well. For example, jQuery makes it really easy to get and manipulate page content.

Now normally you do this using the Document Object Model or the DOM. If you are not familiar with the DOM, then lynda.com has a great title known as JavaScript Essential Training by Dori Smith, and you can go check that out to learn more about the DOM. jQuery makes that really simple. jQuery also makes it really simple to work with the modern browser event model, and again this is a key part of building modern Web 2.0 applications. Finally, jQuery adds a pretty sophisticated effects library that you can use to achieve a lot of sophisticated transitions and effects that you see in modern websites today, things like image fades and animations and events and that kind of stuff.

If you take a look at how most modern web development is done today, there are a couple of scenarios that seems to pop up over and over again. They typically follow a couple of very common patterns. The first pattern is usually when the page loads in the browser, there is a bunch of setup that you have to do, and this is usually in response to the window load event, and jQuery provides a really efficient way of handling this. The second scenario that pops up a lot looks something like this. There is an event that happens on the browser. The user clicks on something or they type a key or they move the mouse over something, and that sets off a reaction, something along the lines of, you retrieve the content from the page, then you do some kind of manipulation on it.

Maybe you animate it somehow and then you put the content back in the page. Now this may not be followed exactly, but the pattern is essentially along these lines where the user does something, and in response to that event you have to somehow get content and manipulate it. And jQuery makes these scenarios really, really easy. Some of the benefits of using jQuery are first, jQuery leverages your existing knowledge of CSS. So if you are already familiar with CSS, then you will see this throughout the course.

You'll find yourself writing syntax that looks a lot like CSS code, which makes it really easy to pick up some of the jQuery's best features. jQuery is also built from the ground up to work with sets of elements. This is something that Document Object Model in JavaScript is not designed to do very well. jQuery makes it second nature. In fact, many times you won't even realize that you are writing code that just by default works across sets of elements. jQuery also allows you to perform multiple operations on a set of elements with just one line of code, and this is a very powerful feature known as Statement Chaining.

You'll see this again and again throughout the course. It really simplifies the way that you work with JavaScript and elements in the page and it's one of the jQuery's best features and we'll see that throughout the course. Now as I mention before, jQuery hides away a lot of the various browser quirks and this allows you to concentrate on your end result. So you don't spend a lot of time trying to figure out how to achieve each effect within each individual browser. You simply write to the jQuery interface and jQuery handles all of the individual browser features behind the scenes.

Finally jQuery is really extensible. There are a lot of plug-ins available that perform all kinds of web development tasks. In fact, it's pretty easy to learn how to write your own, but in many cases you won't have to. The jQuery website contains hundreds of plug-ins that have written by other people, that you can just freely download and use in your own pages. jQuery is currently compatible with modern versions of all the main browsers that are in use today. So you can use jQuery across Internet Explorer, Safari, Chrome, Firefox and Opera.

You can see that it works with all the current versions going back in some cases pretty far. So you can see jQuery works with IE 6 and later. But there are some known issues with some of the browsers and I have listed those here in the table. So you can see which browsers work well with jQuery and which ones don't. But the main point here is that all the main browsers that are being used today, this should cover the vast majority of all the browsers that your code is going to encounter. Okay, so now that we have seen what jQuery is, let's jump over the jQuery site and take a look at some of the features and see how to download and install it.

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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