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Overview of selectors and filters

From: jQuery Essential Training

Video: Overview of selectors and filters

In this section, we are going to look at how to use jQuery to retrieve content from the page. In fact, you could use jQuery to do almost nothing else more than this. This is one of jQuery's best features. This is something that you would usually use the DOM for in the past and it's one of the things that jQuery makes much easier. We are going to start by looking at the selectors and filters feature of jQuery. jQuery's selectors and filters do essentially exactly what their name implies that they do.

Overview of selectors and filters

In this section, we are going to look at how to use jQuery to retrieve content from the page. In fact, you could use jQuery to do almost nothing else more than this. This is one of jQuery's best features. This is something that you would usually use the DOM for in the past and it's one of the things that jQuery makes much easier. We are going to start by looking at the selectors and filters feature of jQuery. jQuery's selectors and filters do essentially exactly what their name implies that they do.

They select content from the document, so that it can be manipulated using other functions, either jQuery functions or native built-in JavaScript functions. And you can think of jQuery selectors and filters as the query part of the jQuery. Now, the way these work is that jQuery selectors will return an array of objects that match the selection criteria that you give them and the filters will operate on a selector to further refine the results array that the selector returns.

So essentially, you use a selector and that will create an array of objects or elements that are in the document and thefilters will then further refine them. Now, it's important to know that this array that comes back is not a set of DOM elements. It's a collection of jQuery objects that are wrapped around the DOM elements and these jQuery objects provide a large number of predefined functions and properties for further operating on the objects. Now, you can get access to the underlying DOM element for each one of these objects, if you want to, but the whole purpose of doing this is that you are wrapping them in jQuery objects, so that you have a whole bunch of convenience functions and high-level ways of operating on them without having to resort to the DOM in order to do that.

So, now that we understand what selectors and filters are, let's take a look at how to use some of the basic selectors and filters in jQuery.

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This video is part of

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jQuery Essential Training

49 video lessons · 98679 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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