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}}
