Class GlobalsResolver

public

Extends:	EmberObject
Defined in:	packages/ember-application/lib/system/resolver.js:34
Module:	@ember/application

addObserver (key, target, method) Ember.Observable public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:331

key: String; The key to observe
target: Object; The target object to invoke
method: String|Function; The method to invoke
returns: Ember.Observable

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:

component.js

import Component from '@ember/component';

export default 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.

cacheFor (keyName) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:489

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.

decrementProperty (keyName, decrement) Number public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:452

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.

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

destroy EmberObject public

Module:	@ember/application

Inherited from CoreObject packages/ember-runtime/lib/system/core_object.js:445

returns: EmberObject; 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.

get (keyName) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:94

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:

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.

getProperties (list) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:137

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:

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' }

getWithDefault (keyName, defaultValue) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:414

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.

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

incrementProperty (keyName, increment) Number public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:432

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.

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

init public

Module:	@ember/application

Inherited from CoreObject packages/ember-runtime/lib/system/core_object.js:210

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

Example:

const Person = Ember.Object.extend({
  init() {
    alert(`Name is ${this.get('name')}`);
  }
});

let steve = 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.

notifyPropertyChange (keyName) Observable public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:316

keyName: String; The property key to be notified about.
returns: Observable

Convenience method to call propertyWillChange and propertyDidChange in succession.

removeObserver (key, target, method) Ember.Observable public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:382

key: String; The key to observe
target: Object; The target object to invoke
method: String|Function; The method to invoke
returns: Ember.Observable

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.

resolve (fullName) Object public

Module:	@ember/application

Defined in packages/ember-application/lib/system/resolver.js:137

fullName: String; the lookup string
returns: Object; the resolved factory

This method is called via the container's resolver method. It parses the provided fullName and then looks up and returns the appropriate template or class.

set (keyName, value) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:162

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.

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.

setProperties (hash) Object public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:211

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.

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

toString String public

Module:	@ember/application

Inherited from CoreObject packages/ember-runtime/lib/system/core_object.js:498

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.

const Person = Ember.Object.extend()
person = Person.create()
person.toString() //=> "<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:

const Student = Person.extend()
let student = Student.create()
student.toString() //=> "<(subclass of Person):ember1025>"

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

const Teacher = Person.extend({
  toStringExtension() {
    return this.get('fullName');
  }
});
teacher = Teacher.create()
teacher.toString(); //=> "<Teacher:ember1026:Tom Dale>"

toggleProperty (keyName) Boolean public

Module:	@ember/application

Inherited from Observable packages/ember-runtime/lib/mixins/observable.js:472

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.

starship.toggleProperty('warpDriveEngaged');

willDestroy public

Module:	@ember/application

Inherited from CoreObject packages/ember-runtime/lib/system/core_object.js:471

Override to implement teardown.

© 2020 Yehuda Katz, Tom Dale and Ember.js contributors
Licensed under the MIT License.
https://api.emberjs.com/ember/2.18/classes/GlobalsResolver/methods