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Getting ready

From: jQuery for Web Designers

Video: Getting ready

In this movie we're going to take a look at jQuery and how to actually get ready to do things with your DOM. So here is a very simple page which has basically nothing on it except jQuery being referenced here, and now a script tag where I can put my own JavaScript. So jQuery usually is referenced via the dollar sign. You can also reference it by jQuery spelled this way. And jQuery's primary purpose is to query elements of the DOM and then start doing things to them. And the way that works is by using this. It's a function and then you can select stuff in here, which we'll go over later.

Getting ready

In this movie we're going to take a look at jQuery and how to actually get ready to do things with your DOM. So here is a very simple page which has basically nothing on it except jQuery being referenced here, and now a script tag where I can put my own JavaScript. So jQuery usually is referenced via the dollar sign. You can also reference it by jQuery spelled this way. And jQuery's primary purpose is to query elements of the DOM and then start doing things to them. And the way that works is by using this. It's a function and then you can select stuff in here, which we'll go over later.

But before you can actually do anything to the DOM it needs to be fully loaded. And when were working in Vanilla JavaScript we can use the load event or the DOM content loaded event something like that. But jQuery provides a canonical way of making sure that the DOM is ready to do stuff and oddly enough that method is called Ready. So here's how this works. We put the dollar sign, which is the jQuery global, it's a function and we pass into it document. And then we call the Ready method like this. So in here we pass to Ready a handler for what we want to happen once the DOM is actually loaded.

Most of the time when you're working with jQuery and when you read other people's jQuery, you'll see this in the form of an anonymous function, like this. So you'll write out of all this and then in here is where your code goes. There are other forms that this can take, you could take out all this, and just pass your anonymous function right into jQuery. That will work, this is the recommended syntax. There are other ways as well but this is the one that they recommend, so this is the one we are going to stick with. One thing I'll mention if your working in an environment where there's more then one JavaScript library loaded. Like if your using Prototype, one of the original JavaScript libraries, the dollar sign might be used by that other library.

If that's the case, then you can use jQuery here and then pass the dollar sign as an argument here. And then once you're in your anonymous function you can start doing stuff with the dollar sign again and it will work fine, you won't have to spell out jQuery every time. So just to show that this actually works, I am going to restore the original syntax and then we're going to use console.log to pass a message into the console. Now let's load this in a browser and see if it works. Okay, so here we are in Chrome. I'm going to reload this, to make sure I have the latest copy. Open up my console using command+option+i, and there we are.

Message for you sir, great. So when you're getting set to use jQuery, use this syntax to make sure that your DOM is loaded. And everything else will be taken care of for you.

Show transcript

This video is part of

Image for jQuery for Web Designers
jQuery for Web Designers

37 video lessons · 12899 viewers

Joe Chellman
Author

 
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  1. 2m 17s
    1. Welcome
      1m 4s
    2. What you should know
      37s
    3. Using the exercise files
      36s
  2. 12m 0s
    1. jQuery is a JavaScript library?
      1m 15s
    2. When to use jQuery
      2m 51s
    3. Alternatives to jQuery
      1m 25s
    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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