Observable

Ember.Observable Class

PUBLIC

Defined in: packages/ember-runtime/lib/mixins/observable.js:26

Module: ember-runtime

Overview

This mixin provides properties and property observing functionality, core features of the Ember object model.

Properties and observers allow one object to observe changes to a property on another object. This is one of the fundamental ways that models, controllers and views communicate with each other in an Ember application.

Any object that has this mixin applied can be used in observer operations. That includes Ember.Object and most objects you will interact with as you write your Ember application.

Note that you will not generally apply this mixin to classes yourself, but you will use the features provided by this module frequently, so it is important to understand how to use it.

Using get() and set()

Because of Ember's support for bindings and observers, you will always access properties using the get method, and set properties using the set method. This allows the observing objects to be notified and computed properties to be handled properly.

More documentation about get and set are below.

Observing Property Changes

You typically observe property changes simply by using the Ember.observer function in classes that you write.

For example:

Ember.Object.extend({
  valueObserver: Ember.observer('value', function(sender, key, value, rev) {
    // Executes whenever the "value" property changes
    // See the addObserver method for more information about the callback arguments
  })
});

Although this is the most common way to add an observer, this capability is actually built into the Ember.Object class on top of two methods defined in this mixin: addObserver and removeObserver. You can use these two methods to add and remove observers yourself if you need to do so at runtime.

To add an observer for a property, call:

object.addObserver('propertyKey', targetObject, targetAction)

This will call the targetAction method on the targetObject whenever the value of the propertyKey changes.

Note that if propertyKey is a computed property, the observer will be called when any of the property dependencies are changed, even if the resulting value of the computed property is unchanged. This is necessary because computed properties are not computed until get is called.

addObserver (key, target, method) public

Defined in packages/ember-runtime/lib/mixins/observable.js:333

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.

Observer Methods

Observer methods have the following signature:

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.addObserver('foo', this, 'fooDidChange');
  },

  fooDidChange(sender, key, value, rev) {
    // your code
  }
});

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.

Usually you will not need the value 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.

Parameters:

key String
The key to observe
target Object
The target object to invoke
method String|Function
The method to invoke

beginPropertyChangesEmber.Observableprivate

Defined in packages/ember-runtime/lib/mixins/observable.js:231

Begins a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call this method at the beginning of the changes to begin deferring change notifications. When you are done making changes, call endPropertyChanges() to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

cacheFor (keyName) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:485

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.

Parameters:

keyName String

Returns:

Object
The cached value of the computed property, if any

decrementProperty (keyName, decrement) Numberpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:448

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

player.decrementProperty('lives');
orc.decrementProperty('health', 5);

Parameters:

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

endPropertyChangesEmber.Observableprivate

Defined in packages/ember-runtime/lib/mixins/observable.js:251

Ends a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call beginPropertyChanges() at the beginning of the changes to defer change notifications. When you are done making changes, call this method to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

get (keyName) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:96

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:

fullName: Ember.computed('firstName', 'lastName', function() {
  return this.get('firstName') + ' ' + this.get('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.

Parameters:

keyName String
The property to retrieve

Returns:

Object
The property value or undefined.

getProperties (list) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:139

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

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

is equivalent to:

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

Parameters:

list String...|Array
of keys to get

Returns:

Object

getWithDefault (keyName, defaultValue) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:410

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

person.getWithDefault('lastName', 'Doe');

Parameters:

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.

hasObserverFor (key) Booleanprivate

Defined in packages/ember-runtime/lib/mixins/observable.js:395

Returns true if the object currently has observers registered for a particular key. You can use this method to potentially defer performing an expensive action until someone begins observing a particular property on the object.

Parameters:

key String
Key to check

Returns:

Boolean

incrementProperty (keyName, increment) Numberpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:428

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

person.incrementProperty('age');
team.incrementProperty('score', 2);

Parameters:

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

notifyPropertyChange (keyName) Ember.Observablepublic

Defined in packages/ember-runtime/lib/mixins/observable.js:318

Convenience method to call propertyWillChange and propertyDidChange in succession.

Parameters:

keyName String
The property key to be notified about.

Returns:

Ember.Observable

propertyDidChange (keyName) Ember.Observableprivate

Defined in packages/ember-runtime/lib/mixins/observable.js:294

Notify the observer system that a property has just changed.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyWillChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that has just changed.

Returns:

Ember.Observable

propertyWillChange (keyName) Ember.Observableprivate

Defined in packages/ember-runtime/lib/mixins/observable.js:270

Notify the observer system that a property is about to change.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyDidChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that is about to change.

Returns:

Ember.Observable

removeObserver (key, target, method) public

Defined in packages/ember-runtime/lib/mixins/observable.js:380

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.

Parameters:

key String
The key to observe
target Object
The target object to invoke
method String|Function
The method to invoke

set (keyName, value) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:164

Sets the provided key or path to the value.

record.set("key", 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.

Parameters:

keyName String
The property to set
value Object
The value to set or `null`.

Returns:

Object
The passed value

setProperties (hash) Objectpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:213

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

record.setProperties({ firstName: 'Charles', lastName: 'Jolley' });

Parameters:

hash Object
the hash of keys and values to set

Returns:

Object
The passed in hash

toggleProperty (keyName) Booleanpublic

Defined in packages/ember-runtime/lib/mixins/observable.js:468

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

starship.toggleProperty('warpDriveEngaged');

Parameters:

keyName String
The name of the property to toggle

Returns:

Boolean
The new property value

© 2017 Yehuda Katz, Tom Dale and Ember.js contributors
Licensed under the MIT License.
https://emberjs.com/api/classes/Ember.Observable.html

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