Ember.js ObjectProxy init() Method
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 a method that will invoke whenever the object is instantiated. By default, this method does nothing we have to override this method 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 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: Type the following code to generate the route for this example:
ember generate route init1
- app/components/arr2.js
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: ${ this .fullName}`); }), }); export default Ember.Component.extend({ students: [ Student.create({ firstName: 'Balit' , lastName: 'stark' , Id: 'stu2' , }), Student.create({ firstName: 'Permu' , lastName: 'scott' , Id: 'stu0' , }), Student.create({ firstName: 'Sam' , lastName: 'melo' , Id: 'stu1' , }), Student.create({ firstName: 'Pokhu' , lastName: 'Verma' , Id: 'stu3' , }), Student.create({ firstName: 'Tanu' , lastName: 'Agrawal' , Id: 'stu4' , }), Student.create({ firstName: 'Arabh' , lastName: 'Singh' , Id: 'stu5' , })], @tracked item3: 'Gulshan' , @tracked item2: 'Verma' , @tracked item1: 'stu6' , @action print(data1, data2, data3) { let temp = Student.create({ firstName: data1, lastName: data2, Id: data3 }); this .students.addObject(temp); } }) |
- app/components/arr2.hbs
HTML
{{yield}} < table > < tr > < th >Name</ th > < th >Id</ th > </ tr > {{#each this.students as |detail|}} < tr > < td >{{detail.fullName}}</ td > < td >{{get detail "Id"}}</ td > </ tr > {{/each}} </ table > < br /> < div > < label >Enter Student FirstName: </ label > {{input value=this.item3}} </ div > < br /> < div > < label >Enter Student LastName: </ label > {{input value=this.item2}} </ div > < br /> < div > < label >Enter Student Id: </ label > {{input value=this.item1}} </ div > < br /> < input type = "button" id = "set-code" value = "Update Student details" {{action "print" this.item3 this.item2 this.item1}} /> |
- app/templates/init1.hbs
HTML
< Arr2 >< h3 >Student's List :</ h3 ></ Arr2 > |
Output:
Example 2: Type the following code to generate the route for this example:
ember generate route init2
- app/components/arr.js
Javascript
import Component from '@glimmer/component' ; import Ember from 'ember' ; import EmberObject from '@ember/object' ; import { action, without, set, get } from '@ember/object' ; const Fruit = EmberObject.extend({ init() { alert(`${ 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 Fruit" {{action "insertItem" this.item1 this.item2 this.item3}} /> </ div > {{outlet}} |
- app/templates/init2.hbs
HTML
< Arr >< h3 >Fruit's List :</ h3 ></ Arr > |
Output:
Reference: https://api.emberjs.com/ember/4.6/classes/ObjectProxy/methods/init?anchor=init
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