Class Ember.View

public

Ember.View is the class in Ember responsible for encapsulating templates of HTML content, combining templates with data to render as sections of a page's DOM, and registering and responding to user-initiated events.

HTML Tag

The default HTML tag name used for a view's DOM representation is div. This can be customized by setting the tagName property. The following view class:

1
2
3
ParagraphView = Ember.View.extend({
  tagName: 'em'
});

Would result in instances with the following HTML:

1
<em id="ember1" class="ember-view"></em>

HTML class Attribute

The HTML class attribute of a view's tag can be set by providing a classNames property that is set to an array of strings:

1
2
3
MyView = Ember.View.extend({
  classNames: ['my-class', 'my-other-class']
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view my-class my-other-class"></div>

class attribute values can also be set by providing a classNameBindings property set to an array of properties names for the view. The return value of these properties will be added as part of the value for the view's class attribute. These properties can be computed properties:

1
2
3
4
5
6
7
MyView = Ember.View.extend({
  classNameBindings: ['propertyA', 'propertyB'],
  propertyA: 'from-a',
  propertyB: Ember.computed(function() {
    if (someLogic) { return 'from-b'; }
  })
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view from-a from-b"></div>

If the value of a class name binding returns a boolean the property name itself will be used as the class name if the property is true. The class name will not be added if the value is false or undefined.

1
2
3
4
MyView = Ember.View.extend({
  classNameBindings: ['hovered'],
  hovered: true
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view hovered"></div>

When using boolean class name bindings you can supply a string value other than the property name for use as the class HTML attribute by appending the preferred value after a ":" character when defining the binding:

1
2
3
4
MyView = Ember.View.extend({
  classNameBindings: ['awesome:so-very-cool'],
  awesome: true
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view so-very-cool"></div>

Boolean value class name bindings whose property names are in a camelCase-style format will be converted to a dasherized format:

1
2
3
4
MyView = Ember.View.extend({
  classNameBindings: ['isUrgent'],
  isUrgent: true
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view is-urgent"></div>

Class name bindings can also refer to object values that are found by traversing a path relative to the view itself:

1
2
3
4
5
6
MyView = Ember.View.extend({
  classNameBindings: ['messages.empty']
  messages: Ember.Object.create({
    empty: true
  })
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view empty"></div>

If you want to add a class name for a property which evaluates to true and and a different class name if it evaluates to false, you can pass a binding like this:

1
2
3
4
5
// Applies 'enabled' class when isEnabled is true and 'disabled' when isEnabled is false
Ember.View.extend({
  classNameBindings: ['isEnabled:enabled:disabled']
  isEnabled: true
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view enabled"></div>

When isEnabled is false, the resulting HTML representation looks like this:

1
<div id="ember1" class="ember-view disabled"></div>

This syntax offers the convenience to add a class if a property is false:

1
2
3
4
5
// Applies no class when isEnabled is true and class 'disabled' when isEnabled is false
Ember.View.extend({
  classNameBindings: ['isEnabled::disabled']
  isEnabled: true
});

Will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view"></div>

When the isEnabled property on the view is set to false, it will result in view instances with an HTML representation of:

1
<div id="ember1" class="ember-view disabled"></div>

Updates to the value of a class name binding will result in automatic update of the HTML class attribute in the view's rendered HTML representation. If the value becomes false or undefined the class name will be removed.

Both classNames and classNameBindings are concatenated properties. See Ember.Object documentation for more information about concatenated properties.

HTML Attributes

The HTML attribute section of a view's tag can be set by providing an attributeBindings property set to an array of property names on the view. The return value of these properties will be used as the value of the view's HTML associated attribute:

1
2
3
4
5
AnchorView = Ember.View.extend({
  tagName: 'a',
  attributeBindings: ['href'],
  href: 'http://google.com'
});

Will result in view instances with an HTML representation of:

1
<a id="ember1" class="ember-view" href="http://google.com"></a>

One property can be mapped on to another by placing a ":" between the source property and the destination property:

1
2
3
4
5
AnchorView = Ember.View.extend({
  tagName: 'a',
  attributeBindings: ['url:href'],
  url: 'http://google.com'
});

Will result in view instances with an HTML representation of:

1
<a id="ember1" class="ember-view" href="http://google.com"></a>

Namespaced attributes (e.g. xlink:href) are supported, but have to be mapped, since : is not a valid character for properties in Javascript:

1
2
3
4
5
UseView = Ember.View.extend({
  tagName: 'use',
  attributeBindings: ['xlinkHref:xlink:href'],
  xlinkHref: '#triangle'
});

Will result in view instances with an HTML representation of:

1
<use xlink:href="#triangle"></use>

If the return value of an attributeBindings monitored property is a boolean the attribute will be present or absent depending on the value:

1
2
3
4
5
MyTextInput = Ember.View.extend({
  tagName: 'input',
  attributeBindings: ['disabled'],
  disabled: false
});

Will result in a view instance with an HTML representation of:

1
<input id="ember1" class="ember-view" />

attributeBindings can refer to computed properties:

1
2
3
4
5
6
7
8
9
10
11
MyTextInput = Ember.View.extend({
  tagName: 'input',
  attributeBindings: ['disabled'],
  disabled: Ember.computed(function() {
    if (someLogic) {
      return true;
    } else {
      return false;
    }
  })
});

To prevent setting an attribute altogether, use null or undefined as the return value of the attributeBindings monitored property:

1
2
3
4
5
MyTextInput = Ember.View.extend({
  tagName: 'form',
  attributeBindings: ['novalidate'],
  novalidate: null
});

Updates to the property of an attribute binding will result in automatic update of the HTML attribute in the view's rendered HTML representation.

attributeBindings is a concatenated property. See Ember.Object documentation for more information about concatenated properties.

Layouts

Views can have a secondary template that wraps their main template. Like primary templates, layouts can be any function that accepts an optional context parameter and returns a string of HTML that will be inserted inside view's tag. Views whose HTML element is self closing (e.g. <input />) cannot have a layout and this property will be ignored.

Most typically in Ember a layout will be a compiled template.

A view's layout can be set directly with the layout property or reference an existing template by name with the layoutName property.

A template used as a layout must contain a single use of the {{yield}} helper. The HTML contents of a view's rendered template will be inserted at this location:

1
2
3
4
AViewWithLayout = Ember.View.extend({
  layout: Ember.HTMLBars.compile("<div class='my-decorative-class'>{{yield}}</div>"),
  template: Ember.HTMLBars.compile("I got wrapped")
});

Will result in view instances with an HTML representation of:

1
2
3
4
5
<div id="ember1" class="ember-view">
  <div class="my-decorative-class">
    I got wrapped
  </div>
</div>

See Ember.Templates.helpers.yield for more information.

Responding to Browser Events

Views can respond to user-initiated events in one of three ways: method implementation, through an event manager, and through {{action}} helper use in their template or layout.

Method Implementation

Views can respond to user-initiated events by implementing a method that matches the event name. A jQuery.Event object will be passed as the argument to this method.

1
2
3
4
5
6
AView = Ember.View.extend({
  click: function(event) {
    // will be called when an instance's
    // rendered element is clicked
  }
});

Event Managers

Views can define an object as their eventManager property. This object can then implement methods that match the desired event names. Matching events that occur on the view's rendered HTML or the rendered HTML of any of its DOM descendants will trigger this method. A jQuery.Event object will be passed as the first argument to the method and an Ember.View object as the second. The Ember.View will be the view whose rendered HTML was interacted with. This may be the view with the eventManager property or one of its descendant views.

1
2
3
4
5
6
7
8
9
10
AView = Ember.View.extend({
  eventManager: Ember.Object.create({
    doubleClick: function(event, view) {
      // will be called when an instance's
      // rendered element or any rendering
      // of this view's descendant
      // elements is clicked
    }
  })
});

An event defined for an event manager takes precedence over events of the same name handled through methods on the view.

1
2
3
4
5
6
7
8
9
10
AView = Ember.View.extend({
  mouseEnter: function(event) {
    // will never trigger.
  },
  eventManager: Ember.Object.create({
    mouseEnter: function(event, view) {
      // takes precedence over AView#mouseEnter
    }
  })
});

Similarly a view's event manager will take precedence for events of any views rendered as a descendant. A method name that matches an event name will not be called if the view instance was rendered inside the HTML representation of a view that has an eventManager property defined that handles events of the name. Events not handled by the event manager will still trigger method calls on the descendant.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
var App = Ember.Application.create();
App.OuterView = Ember.View.extend({
  template: Ember.HTMLBars.compile("outer {{#view 'inner'}}inner{{/view}} outer"),
  eventManager: Ember.Object.create({
    mouseEnter: function(event, view) {
      // view might be instance of either
      // OuterView or InnerView depending on
      // where on the page the user interaction occurred
    }
  })
});

App.InnerView = Ember.View.extend({
  click: function(event) {
    // will be called if rendered inside
    // an OuterView because OuterView's
    // eventManager doesn't handle click events
  },
  mouseEnter: function(event) {
    // will never be called if rendered inside
    // an OuterView.
  }
});

{{action}} Helper

See Ember.Templates.helpers.action.

Event Names

All of the event handling approaches described above respond to the same set of events. The names of the built-in events are listed below. (The hash of built-in events exists in Ember.EventDispatcher.) Additional, custom events can be registered by using Ember.Application.customEvents.

Touch events:

  • touchStart
  • touchMove
  • touchEnd
  • touchCancel

Keyboard events

  • keyDown
  • keyUp
  • keyPress

Mouse events

  • mouseDown
  • mouseUp
  • contextMenu
  • click
  • doubleClick
  • mouseMove
  • focusIn
  • focusOut
  • mouseEnter
  • mouseLeave

Form events:

  • submit
  • change
  • focusIn
  • focusOut
  • input

HTML5 drag and drop events:

  • dragStart
  • drag
  • dragEnter
  • dragLeave
  • dragOver
  • dragEnd
  • drop

Show:

Module: ember
key
String
The key to observer
target
Object
The target object to invoke
method
String|Function
The method to invoke.

Adds an observer on a property.

This is the core method used to register an observer for a property.

Once you call this method, any time the key's value is set, your observer will be notified. Note that the observers are triggered any time the value is set, regardless of whether it has actually changed. Your observer should be prepared to handle that.

You can also pass an optional context parameter to this method. The context will be passed to your observer method whenever it is triggered. Note that if you add the same target/method pair on a key multiple times with different context parameters, your observer will only be called once with the last context you passed.

Observer Methods

Observer methods you pass should generally have the following signature if you do not pass a context parameter:

1
fooDidChange: function(sender, key, value, rev) { };

The sender is the object that changed. The key is the property that changes. The value property is currently reserved and unused. The rev is the last property revision of the object when it changed, which you can use to detect if the key value has really changed or not.

If you pass a context parameter, the context will be passed before the revision like so:

1
fooDidChange: function(sender, key, value, context, rev) { };

Usually you will not need the value, context or revision parameters at the end. In this case, it is common to write observer methods that take only a sender and key value as parameters or, if you aren't interested in any of these values, to write an observer that has no parameters at all.

Module: ember
keyName
String
returns
Object
The cached value of the computed property, if any

Returns the cached value of a computed property, if it exists. This allows you to inspect the value of a computed property without accidentally invoking it if it is intended to be generated lazily.

Module: ember
arguments

Creates an instance of a class. Accepts either no arguments, or an object containing values to initialize the newly instantiated object with.

1
2
3
4
5
6
7
8
9
10
11
App.Person = Ember.Object.extend({
  helloWorld: function() {
    alert("Hi, my name is " + this.get('name'));
  }
});

var tom = App.Person.create({
  name: 'Tom Dale'
});

tom.helloWorld(); // alerts "Hi, my name is Tom Dale".

create will call the init function if defined during Ember.AnyObject.extend

If no arguments are passed to create, it will not set values to the new instance during initialization:

1
2
var noName = App.Person.create();
noName.helloWorld(); // alerts undefined

NOTE: For performance reasons, you cannot declare methods or computed properties during create. You should instead declare methods and computed properties when using extend.

Module: ember
keyName
String
The name of the property to decrement
decrement
Number
The amount to decrement by. Defaults to 1
returns
Number
The new property value

Set the value of a property to the current value minus some amount.

1
2
player.decrementProperty('lives');
orc.decrementProperty('health', 5);
Module: ember
returns
Ember.Object
receiver

Destroys an object by setting the isDestroyed flag and removing its metadata, which effectively destroys observers and bindings.

If you try to set a property on a destroyed object, an exception will be raised.

Note that destruction is scheduled for the end of the run loop and does not happen immediately. It will set an isDestroying flag immediately.

Module: ember
mixins
Mixin
One or more Mixin classes
arguments
Object
Object containing values to use within the new class

Creates a new subclass.

1
2
3
4
5
App.Person = Ember.Object.extend({
  say: function(thing) {
    alert(thing);
   }
});

This defines a new subclass of Ember.Object: App.Person. It contains one method: say().

You can also create a subclass from any existing class by calling its extend() method. For example, you might want to create a subclass of Ember's built-in Ember.View class:

1
2
3
4
App.PersonView = Ember.View.extend({
  tagName: 'li',
  classNameBindings: ['isAdministrator']
});

When defining a subclass, you can override methods but still access the implementation of your parent class by calling the special _super() method:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
App.Person = Ember.Object.extend({
  say: function(thing) {
    var name = this.get('name');
    alert(name + ' says: ' + thing);
  }
});

App.Soldier = App.Person.extend({
  say: function(thing) {
    this._super(thing + ", sir!");
  },
  march: function(numberOfHours) {
    alert(this.get('name') + ' marches for ' + numberOfHours + ' hours.');
  }
});

var yehuda = App.Soldier.create({
  name: "Yehuda Katz"
});

yehuda.say("Yes");  // alerts "Yehuda Katz says: Yes, sir!"

The create() on line #17 creates an instance of the App.Soldier class. The extend() on line #8 creates a subclass of App.Person. Any instance of the App.Person class will not have the march() method.

You can also pass Mixin classes to add additional properties to the subclass.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
App.Person = Ember.Object.extend({
  say: function(thing) {
    alert(this.get('name') + ' says: ' + thing);
  }
});

App.SingingMixin = Mixin.create({
  sing: function(thing){
    alert(this.get('name') + ' sings: la la la ' + thing);
  }
});

App.BroadwayStar = App.Person.extend(App.SingingMixin, {
  dance: function() {
    alert(this.get('name') + ' dances: tap tap tap tap ');
  }
});

The App.BroadwayStar class contains three methods: say(), sing(), and dance().

Module: ember
keyName
String
The property to retrieve
returns
Object
The property value or undefined.

Retrieves the value of a property from the object.

This method is usually similar to using object[keyName] or object.keyName, however it supports both computed properties and the unknownProperty handler.

Because get unifies the syntax for accessing all these kinds of properties, it can make many refactorings easier, such as replacing a simple property with a computed property, or vice versa.

Computed Properties

Computed properties are methods defined with the property modifier declared at the end, such as:

1
2
3
fullName: function() {
  return this.get('firstName') + ' ' + this.get('lastName');
}.property('firstName', 'lastName')

When you call get on a computed property, the function will be called and the return value will be returned instead of the function itself.

Unknown Properties

Likewise, if you try to call get on a property whose value is undefined, the unknownProperty() method will be called on the object. If this method returns any value other than undefined, it will be returned instead. This allows you to implement "virtual" properties that are not defined upfront.

Module: ember
list
String...|Array
of keys to get
returns
Object

To get the values of multiple properties at once, call getProperties with a list of strings or an array:

1
2
record.getProperties('firstName', 'lastName', 'zipCode');
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }

is equivalent to:

1
2
record.getProperties(['firstName', 'lastName', 'zipCode']);
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }
Module: ember
keyName
String
The name of the property to retrieve
defaultValue
Object
The value to return if the property value is undefined
returns
Object
The property value or the defaultValue.

Retrieves the value of a property, or a default value in the case that the property returns undefined.

1
person.getWithDefault('lastName', 'Doe');
Module: ember
name
String
The name of the event
returns
Boolean
does the object have a subscription for event

Checks to see if object has any subscriptions for named event.

Module: ember
keyName
String
The name of the property to increment
increment
Number
The amount to increment by. Defaults to 1
returns
Number
The new property value

Set the value of a property to the current value plus some amount.

1
2
person.incrementProperty('age');
team.incrementProperty('score', 2);
Module: ember

An overridable method called when objects are instantiated. By default, does nothing unless it is overridden during class definition.

Example:

1
2
3
4
5
6
7
8
9
10
11
App.Person = Ember.Object.extend({
  init: function() {
    alert('Name is ' + this.get('name'));
  }
});

var steve = App.Person.create({
  name: "Steve"
});

// alerts 'Name is Steve'.

NOTE: If you do override init for a framework class like Ember.View, be sure to call this._super(...arguments) in your init declaration! If you don't, Ember may not have an opportunity to do important setup work, and you'll see strange behavior in your application.

Module: ember
keyName
String
The property key to be notified about.
returns
Ember.Observable

Convenience method to call propertyWillChange and propertyDidChange in succession.

Module: ember
name
String
The name of the event
target
Object
The target of the subscription
method
Function
The function of the subscription
returns
this

Cancels subscription for given name, target, and method.

Module: ember
name
String
The name of the event
target
Object
The "this" binding for the callback
method
Function
The callback to execute
returns
this

Subscribes to a named event with given function.

1
2
3
person.on('didLoad', function() {
  // fired once the person has loaded
});

An optional target can be passed in as the 2nd argument that will be set as the "this" for the callback. This is a good way to give your function access to the object triggering the event. When the target parameter is used the callback becomes the third argument.

Module: ember
name
String
The name of the event
target
Object
The "this" binding for the callback
method
Function
The callback to execute
returns
this

Subscribes a function to a named event and then cancels the subscription after the first time the event is triggered. It is good to use one when you only care about the first time an event has taken place.

This function takes an optional 2nd argument that will become the "this" value for the callback. If this argument is passed then the 3rd argument becomes the function.

Module: ember
key
String
The key to observer
target
Object
The target object to invoke
method
String|Function
The method to invoke.

Remove an observer you have previously registered on this object. Pass the same key, target, and method you passed to addObserver() and your target will no longer receive notifications.

Module: ember

Augments a constructor's prototype with additional properties and functions:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
MyObject = Ember.Object.extend({
  name: 'an object'
});

o = MyObject.create();
o.get('name'); // 'an object'

MyObject.reopen({
  say: function(msg){
    console.log(msg);
  }
})

o2 = MyObject.create();
o2.say("hello"); // logs "hello"

o.say("goodbye"); // logs "goodbye"

To add functions and properties to the constructor itself, see reopenClass

Module: ember

Augments a constructor's own properties and functions:

1
2
3
4
5
6
7
8
9
10
MyObject = Ember.Object.extend({
  name: 'an object'
});

MyObject.reopenClass({
  canBuild: false
});

MyObject.canBuild; // false
o = MyObject.create();

In other words, this creates static properties and functions for the class. These are only available on the class and not on any instance of that class.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
App.Person = Ember.Object.extend({
  name : "",
  sayHello : function() {
    alert("Hello. My name is " + this.get('name'));
  }
});

App.Person.reopenClass({
  species : "Homo sapiens",
  createPerson: function(newPersonsName){
    return App.Person.create({
      name:newPersonsName
    });
  }
});

var tom = App.Person.create({
  name : "Tom Dale"
});
var yehuda = App.Person.createPerson("Yehuda Katz");

tom.sayHello(); // "Hello. My name is Tom Dale"
yehuda.sayHello(); // "Hello. My name is Yehuda Katz"
alert(App.Person.species); // "Homo sapiens"

Note that species and createPerson are not valid on the tom and yehuda variables. They are only valid on App.Person.

To add functions and properties to instances of a constructor by extending the constructor's prototype see reopen

Module: ember
actionName
String
The action to trigger
context
*
a context to send with the action

Triggers a named action on the ActionHandler. Any parameters supplied after the actionName string will be passed as arguments to the action target function.

If the ActionHandler has its target property set, actions may bubble to the target. Bubbling happens when an actionName can not be found in the ActionHandler's actions hash or if the action target function returns true.

Example

1
2
3
4
5
6
7
8
9
10
App.WelcomeRoute = Ember.Route.extend({
  actions: {
    playTheme() {
       this.send('playMusic', 'theme.mp3');
    },
    playMusic(track) {
      // ...
    }
  }
});
Module: ember
action
String
the action to call
params
*
arguments for the action

Calls an action passed to a component.

For example a component for playing or pausing music may translate click events into action notifications of "play" or "stop" depending on some internal state of the component:

1
2
3
4
5
6
7
8
9
10
// app/components/play-button.js
export default Ember.Component.extend({
  click() {
    if (this.get('isPlaying')) {
      this.sendAction('play');
    } else {
      this.sendAction('stop');
    }
  }
});

The actions "play" and "stop" must be passed to this play-button component:

1
2
{{! app/templates/application.hbs }}
{{play-button play=(action "musicStarted") stop=(action "musicStopped")}}

When the component receives a browser click event it translate this interaction into application-specific semantics ("play" or "stop") and calls the specified action.

1
2
3
4
5
6
7
8
9
10
11
12
13
// app/controller/application.js
export default Ember.Controller.extend({
  actions: {
    musicStarted() {
      // called when the play button is clicked
      // and the music started playing
    },
    musicStopped() {
      // called when the play button is clicked
      // and the music stopped playing
    }
  }
});

If no action is passed to sendAction a default name of "action" is assumed.

1
2
3
4
5
6
// app/components/next-button.js
export default Ember.Component.extend({
  click() {
    this.sendAction();
  }
});
1
2
{{! app/templates/application.hbs }}
{{next-button action=(action "playNextSongInAlbum")}}
1
2
3
4
5
6
7
8
// app/controllers/application.js
App.ApplicationController = Ember.Controller.extend({
  actions: {
    playNextSongInAlbum() {
      ...
    }
  }
});
Module: ember
keyName
String
The property to set
value
Object
The value to set or `null`.
returns
Object
The passed value

Sets the provided key or path to the value.

This method is generally very similar to calling object[key] = value or object.key = value, except that it provides support for computed properties, the setUnknownProperty() method and property observers.

Computed Properties

If you try to set a value on a key that has a computed property handler defined (see the get() method for an example), then set() will call that method, passing both the value and key instead of simply changing the value itself. This is useful for those times when you need to implement a property that is composed of one or more member properties.

Unknown Properties

If you try to set a value on a key that is undefined in the target object, then the setUnknownProperty() handler will be called instead. This gives you an opportunity to implement complex "virtual" properties that are not predefined on the object. If setUnknownProperty() returns undefined, then set() will simply set the value on the object.

Property Observers

In addition to changing the property, set() will also register a property change with the object. Unless you have placed this call inside of a beginPropertyChanges() and endPropertyChanges(), any "local" observers (i.e. observer methods declared on the same object), will be called immediately. Any "remote" observers (i.e. observer methods declared on another object) will be placed in a queue and called at a later time in a coalesced manner.

Module: ember
hash
Object
the hash of keys and values to set
returns
Object
The passed in hash

Sets a list of properties at once. These properties are set inside a single beginPropertyChanges and endPropertyChanges batch, so observers will be buffered.

1
record.setProperties({ firstName: 'Charles', lastName: 'Jolley' });
Module: ember
returns
String
string representation

Returns a string representation which attempts to provide more information than Javascript's toString typically does, in a generic way for all Ember objects.

1
2
3
App.Person = Em.Object.extend()
person = App.Person.create()
person.toString() //=> "<App.Person:ember1024>"

If the object's class is not defined on an Ember namespace, it will indicate it is a subclass of the registered superclass:

1
2
3
Student = App.Person.extend()
student = Student.create()
student.toString() //=> "<(subclass of App.Person):ember1025>"

If the method toStringExtension is defined, its return value will be included in the output.

1
2
3
4
5
6
7
App.Teacher = App.Person.extend({
  toStringExtension: function() {
    return this.get('fullName');
  }
});
teacher = App.Teacher.create()
teacher.toString(); //=> "<App.Teacher:ember1026:Tom Dale>"
Module: ember
keyName
String
The name of the property to toggle
returns
Boolean
The new property value

Set the value of a boolean property to the opposite of its current value.

1
starship.toggleProperty('warpDriveEngaged');
Module: ember
name
String
The name of the event
args
Object...
Optional arguments to pass on

Triggers a named event for the object. Any additional arguments will be passed as parameters to the functions that are subscribed to the event.

1
2
3
4
5
6
7
person.on('didEat', function(food) {
  console.log('person ate some ' + food);
});

person.trigger('didEat', 'broccoli');

// outputs: person ate some broccoli
Module: ember

Override to implement teardown.