Ember.js is an open-source JavaScript framework used for developing large client-side web applications which is based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.
EmberObject Class: It is the primary foundation class for all Ember objects. It is a CoreObject subclass with the Observable mixin added.
Methods: The following is the list of methods for this class:
- addObserver: This method is used to register an observer for a property.
- cacheFor: This method is used to get the cached value for an already computed property if it exists.
- decrementProperty: This method is used to set the value of the property to the current value minus some amount.
- destroy: This method destroys an object by setting the isDestroyed flag and deleting its metadata.
- get: This method is used to retrieve the value of a property from the object.
- getProperties: This method is used to get the value of multiple properties at once.
- incrementProperty: This method is used to set the value of the property to the current value plus some amount.
- init: This method is called when objects are instantiated.
- notifyPropertyChange: This method alerts the observer system that a property change has taken place.
- removeObserver: This method removes any observers you have registered earlier for this object.
- set: This method is used to set the key and value to the object.
- setProperties: This method sets a number of properties at once.
- toString: This method is to get the string representation of the object.
- toggleProperty: This method is used to set the value of the boolean property to the opposite of its current value.
- willDestroy: This method tears down the object.
Properties: The following is the list of the properties of this class:
- concatenatedProperties: This property specifies the characteristics from the superclass that will be concatenated
- isDestroyed: This property is the destroy complete flag.
- isDestroying: This property is the destroy scheduled flag.
- mergedProperties: This property helps to merge the value of the subclass property’s value with the superclass property value of the ember class.
Step 1: To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:
npm install ember-cli
Step 2: Now you can create the project by typing in the following piece of code:
ember new <project-name> --lang en
To start the server, type:
ember serve
Example 1: In this example we are going to take a look at the toggleProperty method.
Type the following code to generate the route for this example:
ember generate route fruits
app/routes/fruits.js
import Route from '@ember/routing/route' ;
import EmberObject from '@ember/object' ;
import { } from '@ember/array' ;
export default class FruitsRoute extends Route {
fruits = [
EmberObject.create({ name: 'Lady Finger' ,
isFruit: false , color: 'green' }),
EmberObject.create({ name: 'Brinjal' ,
isFruit: false , color: 'purple' }),
EmberObject.create({ name: 'Apple' ,
isFruit: true , color: 'red' }),
EmberObject.create({ name: 'Grapes' ,
isFruit: true , color: 'green' }),
EmberObject.create({ name: 'Mango' ,
isFruit: true , color: 'yellow' }),
EmberObject.create({ name: 'Watermelon' ,
isFruit: true , color: 'red' }),
EmberObject.create({ name: 'Orange' ,
isFruit: true , color: 'orange' })
];
fruits2 = [
EmberObject.create({ name: 'Potato' ,
isFruit: false , color: 'brown' }),
EmberObject.create({ name: 'Tomato' ,
isFruit: false , color: 'red' }),
EmberObject.create({ name: 'Banana' ,
isFruit: true , color: 'Yellow' }),
EmberObject.create({ name: 'Water-melon' ,
isFruit: true , color: 'green' }),
EmberObject.create({ name: 'Papaya' ,
isFruit: true , color: 'yellow' }),
];
model() {
return this .fruits;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'fruits' , this .fruits);
controller.set( 'fruits2' , this .fruits2);
}
} |
app/controllers/fruits.js
import Ember from "ember" ;
import { isAny, isEvery } from "@ember/array" ;
export default Ember.Controller.extend({
actions: {
print() {
let ans = '' ;
this .fruits.forEach((item) => ans +=
item.getProperties( 'name' ).name + '\n' );
alert(ans);
},
Change() {
let ans = this .fruits.forEach((item, i) =>
item.setProperties( this .fruits2.at(i)));
},
toggle() {
this .fruits.forEach((item) =>
item.toggleProperty( 'isFruit' ));
},
},
}); |
app/template/fruits.hbs
{{page-title "toggleProperty"}} < h3 >Here is a list of eatables: </ h3 >
< br />< table >
< tr >
< th >Name</ th >
< th >isFruit</ th >
< th >color</ th >
</ tr >
{{#each @model as |detail|}}
< tr >
< td >{{detail.name}}</ td >
< td >{{detail.isFruit}}</ td >
< td >{{detail.color}}</ td >
</ tr >
{{/each}}
</ table >
< br />
< input type = "button"
id = "list-item"
value = "List all Items"
{{action "print"}} />
< br />< br />
< input
type = "button"
id = "change-item"
value = "Change all Item in Bucket"
{{action "Change"}}
/> < br />< br />
< input
type = "button"
id = "toggle-isFruits"
value = "Toggle isFruit Properties"
{{action "toggle"}}
/> {{outlet}} |
Output:
Example 2: In this example we are going to take a look at the setproperties and toString methods.
Type the following code to generate the route for this example:
ember generate route details
app/routes/details.js
import Route from '@ember/routing/route' ;
import EmberObject from '@ember/object' ;
const Person = EmberObject.extend({ toStringExtension() {
return this .get( 'name' );
}
}); export default class DetailsRoute extends Route {
person;
createPerson() {
let person = Person.create({
name: 'Anubhav' ,
mobile: '1298119967' ,
age: 20,
salary: 10000,
city: 'Patna' ,
country: 'India' ,
gender: 'M' ,
zipCode: '800020' ,
});
return person;
}
changeDetails(person) {
person.setProperties({
age: 51,
country: 'England' ,
});
}
model() {
this .person = this .createPerson();
this .changeDetails( this .person);
return this .person;
}
setupController(controller, model) {
super .setupController(controller, model);
controller.set( 'person' , this .person);
}
} |
app/controllers/details.js
import Ember from 'ember' ;
export default Ember.Controller.extend({
actions: {
clickButton() {
alert( this .person.toString());
}
},
}); |
app/template/details.hbs
{{page-title "Details"}} < h1 >Person</ h1 >
< div >Name: {{this.person.name}}</ div >
< div >Age: {{this.person.age}}</ div >
< div >Salary: {{this.person.salary}}</ div >
< div >Gender: {{this.person.gender}}</ div >
< div >Zip Code: {{this.person.zipCode}}</ div >
< div >Country: {{this.person.country}}</ div >
< div >Mobile: {{this.person.mobile}}</ div >
< br />< br />
< input type = "button" id = "click"
value = "Click Here!" {{action 'clickButton'}}/>
{{outlet}} |
Output:
Reference: https://api.emberjs.com/ember/release/classes/EmberObject