jQuery UI: Adding guide to using jQuery UI with AMD.

Ref gh-186 Closes gh-462
jquery · tjvantoll · Jan 30, 2014 · Feb 20, 2014 · Feb 21, 2014 · Feb 20, 2014
commit cbb1ef77513b625d212e939b512811c096a3710e
diff --git a/order.yml b/order.yml
@@ -101,6 +101,8 @@
   - widget-factory:
     - why-use-the-widget-factory
     - how-to-use-the-widget-factory
+  - environments:
+    - amd
 - jquery-mobile:
   - getting-started
   - theme-roller
diff --git a/page/jquery-ui/environments.md b/page/jquery-ui/environments.md
@@ -0,0 +1,6 @@
+---
+title: Using jQuery UI
+level: intermediate
+---
+
+In addition to being available on [CDN](http://code.jquery.com/)s and [Download Builder](http://jqueryui.com/download/), jQuery UI also integrates into a number of development environments.
diff --git a/page/jquery-ui/environments/amd.md b/page/jquery-ui/environments/amd.md
@@ -0,0 +1,123 @@
+---
+title: Using jQuery UI with AMD
+level: intermediate
+---
+
+As of jQuery UI 1.11, all of the library's source files support using AMD. This means that you can manage your jQuery UI dependencies without using [Download Builder](http://jqueryui.com/download/), and load jQuery UI's source files asynchronously using an AMD loader such as [RequireJS](http://requirejs.org/).
+
+In this article we'll walk through the process of using AMD with jQuery UI. Let's start by discussing the files we'll need.
+
+### Requirements
+
+We'll need to download three things to get up and running: jQuery core, jQuery UI, and an AMD loader.
+
+While any AMD loader will work, we'll use RequireJS in this article, which you can download from <http://requirejs.org/docs/download.html>. If you don't have a version of jQuery core handy, you can get it from <http://jquery.com/download/>, and you can download jQuery UI directly from <http://jqueryui.com/>.
+
+### Directory Structure
+
+Now that we have the files we need, we have to discuss where to place them. For this tutorial, we'll build a small application that uses the following directory structure.
+
+<pre>
+├── index.html
+├── js
+│   ├── app.js
+│   ├── jquery-ui
+│   │   ├── accordion.js
+│   │   ├── autocomplete.js
+│   │   ├── button.js
+│   │   ├── core.js
+│   │   ├── datepicker.js
+│   │   ├── dialog.js
+│   │   └── ...
+│   ├── jquery.js
+│   └── require.js
+</pre>
+
+As you can see, we're placing all JavaScript files in a `js` directory. `jquery.js` and `require.js` are direct children of `js`, and all of jQuery UI's files are within a `jquery-ui` directory. `app.js` will contain our application code.
+
+With RequireJS you're free to use any directory structure you'd like, but with alternative structures you'll have to [change some configuration](http://requirejs.org/docs/api.html#config) so RequireJS knows how to find your dependencies.
+
+### Loading the Application
+
+Now that we have the files in place, let's use them. Here are the contents of our app's `index.html` file.
+
+```
+<!doctype html>
+<html lang="en">
+<head>
+	...
+</head>
+<body>
+
+<script src="js/require.js" data-main="js/app"></script>
+
+</body>
+</html>
+```
+
+`require.js` is loaded in a `<script>` tag, which [by convention](http://requirejs.org/docs/start.html) asynchronously loads and executes the file specified in the `data-main` attribute - in this case `js/app.js`. If you put a `console.log()` statement in `app.js`, you can verify that it loads appropriately.
+
+```
+/* app.js */
+console.log( "loaded" );
+```
+
+Our boilerplate is now in place. Next, we have to load jQuery and jQuery UI.
+
+### Requiring jQuery and jQuery UI
+
+The `require()` function is AMD's mechanism for specifying and loading dependencies; therefore, we can add one to our `app.js` file to load the necessary files. The following loads jQuery UI's autocomplete widget.
+
+```
+require([ "jquery-ui/autocomplete" ], function( autocomplete ) {
+	...
+});
+```
+
+When this code executes, RequireJS asynchronously loads `jquery-ui/autocomplete.js` as well as its dependencies: jQuery core (`jquery.js`), jQuery UI core (`jquery-ui/core.js`), the widget factory (`jquery-ui/widget.js`), the position utility (`jquery-ui/position.js`), and the menu widget (`jquery-ui/menu.js`).
+
+When all dependencies are resolved and loaded, RequireJS invokes the callback function.
+
+### Using jQuery UI's Files
+
+All widgets built with the widget factory expose their constructor function when required with AMD; therefore we can use them to instantiate widgets on elements. The following creates a new `<input>`, initializes an autocomplete widget on it, then appends it to the `<body>`.
+
+```
+require([ "jquery-ui/autocomplete" ], function( autocomplete ) {
+	autocomplete({ source: [ "One", "Two", "Three" ] }, "<input>" )
+		.element
+		.appendTo( "body" );
+});
+```
+
+Each widget's constructor function takes two arguments: the widget's options, and the element to initialize the widget on. Each widget has a default element that is used if no element is provided, which is stored at `$.namespace.widgetName.prototype.defaultElement`. Because `$.ui.autocomplete.prototype.defaultElement` is `<input>`, we can omit the second argument in our autocomplete example.
+
+```
+require([ "jquery-ui/autocomplete" ], function( autocomplete ) {
+	autocomplete({ source: [ "One", "Two", "Three" ] })
+		.element
+		.appendTo( "body" );
+});
+```
+
+Even though we're loading jQuery UI's files with AMD, the files' plugins are still added to the global `jQuery` and `$` objects; therefore you can alternatively use the plugins to instantiate widgets. The following also creates the same autocomplete.
+
+```
+require([ "jquery", "jquery-ui/autocomplete" ], function( $ ) {
+	$( "<input>" )
+		.autocomplete({ source: [ "One", "Two", "Three" ]})
+		.appendTo( "body" );
+});
+```
+
+### Datepicker
+
+Since jQuery UI's datepicker widget is the only jQuery UI widget not built with the widget factory, it does not return a constructor function when required with AMD. Because of this, it's best to stick with datepicker's plugin to instantiate datepicker instances. The following requires datepicker, then uses its plugin to instantiate a datepicker instance on a newly created `<input>`.
+
+```
+require([ "jquery", "jquery-ui/datepicker" ], function( $ ) {
+	$( "<input>" )
+		.appendTo( "body" )
+		.datepicker();
+});
+```