Ember.js Component init() Method

Last Updated : 01 Dec, 2022

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which are 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.

The init() is the method that is invoked whenever the object is instantiated. By default, this method does nothing we have to override as per our use.

Syntax:

init(){ // method algorithm };

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 make 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: Type the following code to generate the route for this example:

ember generate route init1

app/components/arr.js

Javascript

import Component from '@glimmer/component'; 
import Ember from 'ember'; 
import EmberObject from '@ember/object'; 
import { action, without, set, get } from '@ember/object'; 
  
const Fruit = EmberObject.extend({ 
    init() { 
        alert(`${this.get('name')} is in list Now`); 
    } 
}); 
export default Ember.Component.extend({ 
  
    fruits: [ 
        { 
            'name': 'Lady Finger', 
            'isFruit': false, 
            'color': 'green'
        }, 
        { 
            'name': 'Brinjal', 
            'isFruit': false, 
            'color': 'purple'
        }, 
        { 
            'name': 'Apple', 
            'isFruit': true, 
            'color': 'red'
        }, 
        { 
            'name': 'Grapes', 
            'isFruit': true, 
            'color': 'green'
        }, 
        { 
            'name': 'Mango', 
            'isFruit': true, 
            'color': 'yellow'
        }, 
        { 
            'name': 'Watermelon', 
            'isFruit': true, 
            'color': 'red'
        }, 
        { 
            'name': 'Orange', 
            'isFruit': true, 
            'color': 'orange'
        } 
    ], 
    
  
  @action 
insertItem(data, data1, data2) { 
    let temp = Fruit.create({ 
        name: data, 
        isFruit: data1, 
        color: data2 
    }); 
    this.fruits.addObject(temp); 
} 
  
}) 

app/components/arr.hbs

HTML

{{page-title "Init"}} 
<h3>{{yield}}</h3> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Fruit</th> 
        <th>Color</th> 
      </tr> 
      {{#each this.fruits as |detail|}} 
        <tr> 
            <td>{{detail.name}}</td> 
              <td>{{detail.isFruit}}</td> 
              <td>{{detail.color}}</td> 
        </tr> 
      {{/each}} 
</table>     
<br /><br /> 
<div> 
    <label>Enter Fruit Name: </label> 
      {{input value=this.item1}} 
</div><br /> 
<div> 
    <label>Item is Fruit: </label> 
      {{input value=this.item2}} 
</div><br /> 
<div> 
    <label>Enter Fruit color: </label> 
      {{input value=this.item3}} 
</div><br /> 
<div> 
    <input
        type="button"
        id="insert-item"
        value="Insert Furit"
        {{action "insertItem" this.item1 this.item2 this.item3}} 
      /> 
</div> 
{{outlet}}

app/templates/init1.hbs

HTML

<Arr><h3>Fruit's List :</h3></Arr>

Output:

Ember.js Component init() Method

Example 2: Type the following code to generate the route for this example:

ember generate route init2

app/components/arr2js

Javascript

import Component from '@glimmer/component'; 
import { tracked } from '@glimmer/tracking'; 
import { action } from '@ember/object'; 
import Ember from 'ember'; 
  
let Student = Ember.Object.extend({ 
    // these will be supplied by `create` 
    firstName: null, 
    lastName: null, 
  
    init() { 
        alert(`${this.get('firstName')} is Listed`); 
    }, 
    fullName: Ember.computed('firstName', 'lastName', function () { 
        return `${this.firstName} ${this.lastName}`; 
    }), 
  
    Changed: Ember.observer('fullName', function () { 
        console.log(`fullName changed to: ${this.fullName}`); 
    }), 
}); 
  
export default Ember.Component.extend({ 
    students: [ 
        Student.create({ 
            firstName: 'Balit', 
            lastName: 'stark', 
            Id: 'stu2', 
        }), 
        Student.create({ 
            firstName: 'Permu', 
            lastName: 'scott', 
            Id: 'stu0', 
        }), 
        Student.create({ 
            firstName: 'Sam', 
            lastName: 'melo', 
            Id: 'stu1', 
        }), 
        Student.create({ 
            firstName: 'Pokhu', 
            lastName: 'Verma', 
            Id: 'stu3', 
        }), 
        Student.create({ 
            firstName: 'Tanu', 
            lastName: 'Agrawal', 
            Id: 'stu4', 
        }), 
        Student.create({ 
            firstName: 'Arabh', 
            lastName: 'Singh', 
            Id: 'stu5', 
        })],  
  @tracked 
item3: 'Gulshan', 
  @tracked 
item2: 'Verma', 
  @tracked 
item1: 'stu6', 
  
  @action 
print(data1, data2, data3) { 
    let temp = Student.create({ 
        firstName: data1, 
        lastName: data2, 
        Id: data3 
    }); 
    this.students.addObject(temp); 
} 
}) 

app/components/arr.hbs

HTML

{{yield}} 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Id</th> 
      </tr> 
      {{#each this.students as |detail|}} 
        <tr> 
              <td>{{detail.fullName}}</td> 
              <td>{{get detail "Id"}}</td> 
        </tr> 
      {{/each}} 
</table> 
<br /> 
<div> 
    <label>Enter Student FirstName: </label> 
      {{input value=this.item3}} 
</div> 
<br /> 
<div> 
    <label>Enter Student LastName: </label> 
      {{input value=this.item2}} 
</div> 
<br /> 
<div> 
    <label>Enter Student Id: </label> 
      {{input value=this.item1}} 
</div> 
<br /> 
<input
    type="button"
      id="set-code"
      value="Update Student details"
      {{action "print" this.item3 this.item2 this.item1}} 
/>