2 * @class Ext.app.Controller
4 * Controllers are the glue that binds an application together. All they really do is listen for events (usually from
5 * views) and take some action. Here's how we might create a Controller to manage Users:
7 * Ext.define('MyApp.controller.Users', {
8 * extend: 'Ext.app.Controller',
11 * console.log('Initialized Users! This happens before the Application launch function is called');
15 * The init function is a special method that is called when your application boots. It is called before the
16 * {@link Ext.app.Application Application}'s launch function is executed so gives a hook point to run any code before
17 * your Viewport is created.
19 * The init function is a great place to set up how your controller interacts with the view, and is usually used in
20 * conjunction with another Controller function - {@link Ext.app.Controller#control control}. The control function
21 * makes it easy to listen to events on your view classes and take some action with a handler function. Let's update
22 * our Users controller to tell us when the panel is rendered:
24 * Ext.define('MyApp.controller.Users', {
25 * extend: 'Ext.app.Controller',
29 * 'viewport > panel': {
30 * render: this.onPanelRendered
35 * onPanelRendered: function() {
36 * console.log('The panel was rendered');
40 * We've updated the init function to use this.control to set up listeners on views in our application. The control
41 * function uses the new ComponentQuery engine to quickly and easily get references to components on the page. If you
42 * are not familiar with ComponentQuery yet, be sure to check out THIS GUIDE for a full explanation. In brief though,
43 * it allows us to pass a CSS-like selector that will find every matching component on the page.
45 * In our init function above we supplied 'viewport > panel', which translates to "find me every Panel that is a direct
46 * child of a Viewport". We then supplied an object that maps event names (just 'render' in this case) to handler
47 * functions. The overall effect is that whenever any component that matches our selector fires a 'render' event, our
48 * onPanelRendered function is called.
52 * One of the most useful parts of Controllers is the new ref system. These use the new {@link Ext.ComponentQuery} to
53 * make it really easy to get references to Views on your page. Let's look at an example of this now:
55 * Ext.define('MyApp.controller.Users', {
56 * extend: 'Ext.app.Controller',
68 * click: this.refreshGrid
73 * refreshGrid: function() {
74 * this.getList().store.load();
78 * This example assumes the existence of a {@link Ext.grid.Panel Grid} on the page, which contains a single button to
79 * refresh the Grid when clicked. In our refs array, we set up a reference to the grid. There are two parts to this -
80 * the 'selector', which is a {@link Ext.ComponentQuery ComponentQuery} selector which finds any grid on the page and
81 * assigns it to the reference 'list'.
83 * By giving the reference a name, we get a number of things for free. The first is the getList function that we use in
84 * the refreshGrid method above. This is generated automatically by the Controller based on the name of our ref, which
85 * was capitalized and prepended with get to go from 'list' to 'getList'.
87 * The way this works is that the first time getList is called by your code, the ComponentQuery selector is run and the
88 * first component that matches the selector ('grid' in this case) will be returned. All future calls to getList will
89 * use a cached reference to that grid. Usually it is advised to use a specific ComponentQuery selector that will only
90 * match a single View in your application (in the case above our selector will match any grid on the page).
92 * Bringing it all together, our init function is called when the application boots, at which time we call this.control
93 * to listen to any click on a {@link Ext.button.Button button} and call our refreshGrid function (again, this will
94 * match any button on the page so we advise a more specific selector than just 'button', but have left it this way for
95 * simplicity). When the button is clicked we use out getList function to refresh the grid.
97 * You can create any number of refs and control any number of components this way, simply adding more functions to
98 * your Controller as you go. For an example of real-world usage of Controllers see the Feed Viewer example in the
99 * examples/app/feed-viewer folder in the SDK download.
101 * <u>Generated getter methods</u>
103 * Refs aren't the only thing that generate convenient getter methods. Controllers often have to deal with Models and
104 * Stores so the framework offers a couple of easy ways to get access to those too. Let's look at another example:
106 * Ext.define('MyApp.controller.Users', {
107 * extend: 'Ext.app.Controller',
110 * stores: ['AllUsers', 'AdminUsers'],
113 * var User = this.getUserModel(),
114 * allUsers = this.getAllUsersStore();
116 * var ed = new User({name: 'Ed'});
121 * By specifying Models and Stores that the Controller cares about, it again dynamically loads them from the appropriate
122 * locations (app/model/User.js, app/store/AllUsers.js and app/store/AdminUsers.js in this case) and creates getter
123 * functions for them all. The example above will create a new User model instance and add it to the AllUsers Store.
124 * Of course, you could do anything in this function but in this case we just did something simple to demonstrate the
127 * <u>Further Reading</u>
129 * For more information about writing Ext JS 4 applications, please see the <a href="../guide/application_architecture">
130 * application architecture guide</a>. Also see the {@link Ext.app.Application} documentation.
132 * @docauthor Ed Spencer
135 Ext.define('Ext.app.Controller', {
137 * @cfg {String} id The id of this controller. You can use this id when dispatching.
141 observable: 'Ext.util.Observable'
144 onClassExtended: function(cls, data) {
145 var className = Ext.getClassName(cls),
146 match = className.match(/^(.*)\.controller\./);
148 if (match !== null) {
149 var namespace = Ext.Loader.getPrefix(className) || match[1],
150 onBeforeClassCreated = data.onBeforeClassCreated,
152 modules = ['model', 'view', 'store'],
155 data.onBeforeClassCreated = function(cls, data) {
157 items, j, subLn, item;
159 for (i = 0,ln = modules.length; i < ln; i++) {
162 items = Ext.Array.from(data[module + 's']);
164 for (j = 0,subLn = items.length; j < subLn; j++) {
167 prefix = Ext.Loader.getPrefix(item);
169 if (prefix === '' || prefix === item) {
170 requires.push(namespace + '.' + module + '.' + item);
178 Ext.require(requires, Ext.Function.pass(onBeforeClassCreated, arguments, this));
183 constructor: function(config) {
184 this.mixins.observable.constructor.call(this, config);
186 Ext.apply(this, config || {});
188 this.createGetters('model', this.models);
189 this.createGetters('store', this.stores);
190 this.createGetters('view', this.views);
198 init: function(application) {},
200 onLaunch: function(application) {},
202 createGetters: function(type, refs) {
203 type = Ext.String.capitalize(type);
204 Ext.Array.each(refs, function(ref) {
206 parts = ref.split('.');
208 // Handle namespaced class names. E.g. feed.Add becomes getFeedAddView etc.
209 Ext.Array.each(parts, function(part) {
210 fn += Ext.String.capitalize(part);
215 this[fn] = Ext.Function.pass(this['get' + type], [ref], this);
217 // Execute it right away
223 ref: function(refs) {
225 refs = Ext.Array.from(refs);
226 Ext.Array.each(refs, function(info) {
228 fn = 'get' + Ext.String.capitalize(ref);
230 me[fn] = Ext.Function.pass(me.getRef, [ref, info], me);
235 getRef: function(ref, info, config) {
236 this.refCache = this.refCache || {};
238 config = config || {};
240 Ext.apply(info, config);
242 if (info.forceCreate) {
243 return Ext.ComponentManager.create(info, 'component');
247 selector = info.selector,
248 cached = me.refCache[ref];
251 me.refCache[ref] = cached = Ext.ComponentQuery.query(info.selector)[0];
252 if (!cached && info.autoCreate) {
253 me.refCache[ref] = cached = Ext.ComponentManager.create(info, 'component');
256 cached.on('beforedestroy', function() {
257 me.refCache[ref] = null;
265 control: function(selectors, listeners) {
266 this.application.control(selectors, listeners, this);
269 getController: function(name) {
270 return this.application.getController(name);
273 getStore: function(name) {
274 return this.application.getStore(name);
277 getModel: function(model) {
278 return this.application.getModel(model);
281 getView: function(view) {
282 return this.application.getView(view);