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When to use jQuery


From:

jQuery for Web Designers

with Joe Chellman

Video: When to use jQuery

Now let's take a look at when you would use jQuery and perhaps when you wouldn't. So first step, when to use jQuery. The first and most obvious reason to me is, when you're working on a project that already includes it. So if you're building a website in WordPress, Drupal, or if you're using a prototyping toolkit like Bootstrap or Foundation, those already include jQuery. So, you could feel free to use it. You might also use jQuery when you want access to plugins that do things that are useful to you in whatever project you're working. There is an enormous ecosystem of plugins available for jQuery, so if you're trying to do things that plugins accomplish, you may want to use jQuery for access to those.
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  1. 2m 17s
    1. Welcome
      1m 4s
    2. What you should know
      37s
    3. Using the exercise files
      36s
  2. 11m 59s
    1. jQuery is a JavaScript library?
      1m 15s
    2. When to use jQuery
      2m 51s
    3. Alternatives to jQuery
      1m 24s
    4. Which version of jQuery to use
      1m 50s
    5. How to install jQuery
      3m 21s
    6. Reference materials
      1m 18s
  3. 19m 19s
    1. Getting ready
      2m 26s
    2. Selecting elements to use
      3m 54s
    3. Performing multiple operations on the same line with chaining
      2m 30s
    4. Using classes to find what you're looking for
      3m 52s
    5. Adding, modifying, and removing content dynamically
      4m 3s
    6. Challenge: Form feedback
      1m 12s
    7. Solution: Form feedback
      1m 22s
  4. 18m 28s
    1. Triggering a change based on activity with event binding
      4m 37s
    2. Reading and changing values
      4m 17s
    3. Working with HTML attributes
      4m 55s
    4. Challenge: Dynamic contact form
      1m 27s
    5. Solution: Dynamic contact form
      3m 12s
  5. 16m 42s
    1. Using the Colorbox plugin to build a slideshow gallery
      4m 22s
    2. Implementing Colorbox on your site
      2m 46s
    3. Changing Colorbox options
      5m 53s
    4. Challenge: Convert to a slideshow
      1m 6s
    5. Solution: Convert to a slideshow
      2m 35s
  6. 28m 37s
    1. Using jQuery or CSS to animate elements
      2m 24s
    2. Creating simple jQuery animations
      4m 35s
    3. Animating numeric properties with animate()
      4m 56s
    4. Understanding animation easing
      4m 4s
    5. Putting it together: Flowers in the cart
      6m 4s
    6. Callbacks: What to do when the animation ends
      3m 27s
    7. Challenge: Improve the animation
      1m 3s
    8. Solution: Improve the animation
      2m 4s
  7. 4m 45s
    1. More fun plugins
      2m 38s
    2. What's next: More jQuery
      50s
    3. What's next: More JavaScript
      1m 17s

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Watch the Online Video Course jQuery for Web Designers
1h 42m Intermediate Oct 31, 2013

Viewers: in countries Watching now:

Take the next step in your web design career with jQuery, which amplifies JavaScript's power and puts a library of prebuilt functions and a diverse selection of plugins at web designers' fingertips. This course explains what jQuery is, how to install it, and use it to script more interesting, interactive websites. Author Joe Chellman will show you how to use jQuery to add web form usability, audio and video, animation, and other features like slideshow galleries to your existing HTML and CSS-based webpages.

Check out JavaScript for Web Designers for more detailed instruction on JavaScript.

Topics include:
  • What is jQuery?
  • Installing jQuery
  • Performing multiple operations with chaining
  • Using classes
  • Adding, modifying, and removing content dynamically
  • Triggering a change with event binding
  • Creating a dynamic contact form
  • Building a slideshow gallery
  • Creating simple jQuery animations
Subject:
Web
Software:
jQuery
Author:
Joe Chellman

When to use jQuery

Now let's take a look at when you would use jQuery and perhaps when you wouldn't. So first step, when to use jQuery. The first and most obvious reason to me is, when you're working on a project that already includes it. So if you're building a website in WordPress, Drupal, or if you're using a prototyping toolkit like Bootstrap or Foundation, those already include jQuery. So, you could feel free to use it. You might also use jQuery when you want access to plugins that do things that are useful to you in whatever project you're working. There is an enormous ecosystem of plugins available for jQuery, so if you're trying to do things that plugins accomplish, you may want to use jQuery for access to those.

You can also use jQuery if you want to support older versions of Internet Explorer for certain JavaScript functions. jQuery kind of evens out a lot of the capabilities issues that you face while working in JavaScript in older browsers. If you have a lot of skill in CSS and you are really familiar with, using those selectors. jQuery makes it easy to access elements of the document object model using the CSS knowledge that you already have. And more generally, if you just want to make your JavaScript shorter and easier to read, using jQuery can help you with that. Some of these things are a little bit in the abstract right now but as you'll see when we start looking at actual jQuery code, it can be a lot shorter. Okay.

So when might you not use jQuery? First of all, jQuery is a pretty substantial JavaScript library. So if you're not going to use all of what it offers, it might not be the right choice. Now with JQuery 2.0 you can choose parts of the library and not necessarily include the whole thing. So that's pretty useful but it's still lot of code you may need to consider whether you need the whole thing. Another reason not to use jQuery again related to performance is if you absolutely need every single microsecond of speed. When you load jQuery you're increasing the download time for the project that you're working on and so if you need every last bit of performance you may not want to use jQuery.

And likewise, if you need your project to be as small as possible, if you're working in some kind of very constrained environment. Or, you know, if you're working on a JavaSript contest where all of your code has to fit in to one kilobyte or something, then jQuery is probably not the right choice. So here's my overall guidence on when to use jQuery and when perhaps you wouldn't. If you already have jQuery of course use it. So if you're working on a project that includes jQuery, the library, feel free to just use it and you'll be fine. If you're working on a project that you're originating yourself, something from scratch, any situation where jQuery isn't already included, just think about it after you have gotten familiar with it, and see if it's something that you really need.

There are alternatives which we're going to look at. So, for some of the functions that you're trying to access through jQuery, you may be able to use a smaller, faster library to get some of the same stuff. But jQuery is hugely popular, and there are lots of plugins and all kinds of reasons that you might want to use it. And if you think about it, and think you need it, go for it. So that's an overview of some reasons that you might use jQuery, and some reasons that you might not.

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