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Understanding jQuery statement chaining

From: jQuery Essential Training

Video: Understanding jQuery statement chaining

We are getting to the point in the course now where we are going to start doing some much more powerful jQuery coding and before we do that, I want to point out one of jQuery's most powerful features and that is its ability to chain multiple functions together and this basically allows you to perform several operations in just one line of code. jQuery terminology calls this statements chaining and you can see an example there on the screen. So, this is a selector in jQuery just like I have been writing up until now and what I have got here on the end is a dot and then a series of functions.

Understanding jQuery statement chaining

We are getting to the point in the course now where we are going to start doing some much more powerful jQuery coding and before we do that, I want to point out one of jQuery's most powerful features and that is its ability to chain multiple functions together and this basically allows you to perform several operations in just one line of code. jQuery terminology calls this statements chaining and you can see an example there on the screen. So, this is a selector in jQuery just like I have been writing up until now and what I have got here on the end is a dot and then a series of functions.

These functions will get executed in order, starting here on the left and going across to the right. So, you can imagine that the selector will execute. It will come back with a result set of elements in the web page and then I can do multiple operations on those guys. I can assign CSS. I can manipulate the content. I can turn events on and off, that kind of thing. And the reason why this makes jQuery so powerful is that it allows you to perform multiple operations on one result set without having to get that result set over and over and over again, like you might have to do in other scripting conventions.

So, we will see this later on in the course a lot more often, but I wanted to call it to your attention so that you know what it is when you see it. And again, this is one of the things about jQuery that just makes it powerful. It's that you can assign the result set to be operated on by multiple functions. All in one line of code. And again, we will see this later on but I just wanted to call this out, so that when you see it, you know what it is. Okay. So, let's move on to building a practical example using what we have learned so far and the example that we are going to build is annotating some page links in a webpage.

Let's take a look at how that works.

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This video is part of

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jQuery Essential Training

49 video lessons · 99795 viewers

Joe Marini
Author

 
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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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