Ember.js ArrayProxy removeObserver() Method
Last Updated :
26 Apr, 2025
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 removeObserver() method of ArrayProxy is a method that is used to remove the registered observer of the object. This method disconnects the key and observer.
Syntax:
this.object.removeObserver( key, target, method, sync );
Parameters:
- key: It is the from which the observer will remove.
- target: It is an object which is the owner of the key.
- method: It is the which is invoked as per observer command.
- sync: It specifies whether the observer is async or not.
Return type: Observable.
Steps to Install and Run Ember.js:
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 test1
app/routes/test1.js
JavaScript
import Route from '@ember/routing/route';
import ArrayProxy from '@ember/object';
import { computed } from '@ember/object';
import Ember from 'ember';
const Student = ArrayProxy.extend({
Changed: Ember.observer('marks', function () {
console.log(`Marks of ${this.name} changed`);
}),
});
export default class StudentsRoute extends Route {
student = Student.create({
name: 'Arun Verma',
class: 12,
Branch: 'Commerce',
gender: 'M',
marks: 73,
mobile: '837483783',
Roll_No: '1238372',
})
model() {
return this.student;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('student', this.student);
}
}
app/controllers/test1.js
JavaScript
import Ember from 'ember';
import EmberObject from '@ember/object';
import { cacheFor, destroy } from '@ember/object';
export default Ember.Controller.extend({
actions: {
del() {
let temp = this.student.removeObserver('marks', this.student,
'Changed');
console.log('Observer removed!!')
},
Change() {
this.student.set('marks', this.student.get('marks') + 10);
},
}
});
app/templates/test1.hbs
HTML
{{page-title "ArrayProxy"}}
<table>
<h1>Student's Details:</h1>
<div><b>Name:</b> {{this.student.name}}</div>
<div><b>Gender:</b> {{this.student.gender}}</div>
<div><b>Class:</b> {{this.student.class}}</div>
<div><b>Mobile:</b> {{this.student.mobile}}</div>
<div><b>Grade:</b> {{this.student.Grade}}</div>
<div><b>Marks:</b> {{this.student.marks}}</div>
<div><b>Branch:</b> {{this.student.Branch}}</div>
</table>
<br /><br/>
<input
type="button"
id="remove"
value="Remove Observer"
{{action 'del'}}
/><br /><br/>
<input
type="button"
id="Change"
value="Change The Marks"
{{action 'Change'}}
/>
{{outlet}}
Output:
removeObserver output1
Example 2: Type the following code to generate the route for this example:
ember generate route test2
app/routes/test2.js
JavaScript
import Route from '@ember/routing/route';
import { computed } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import Ember from 'ember';
import ArrayProxy from '@ember/object/proxy';
const Employee = ArrayProxy.extend({
fullName: computed('firstName', 'lastName', function () {
return this.get('firstName') + ' ' +
this.get('lastName');
}),
change: Ember.observer('age', function () {
console.log(`Age is changed`);
}),
});
export default class DetailsRoute extends Route {
value = 34;
@tracked
person = Employee.create({
firstName: 'Rohil',
lastName: 'Sahu',
mobile: '928393839',
age: 32,
language: 'Hindi',
country: 'India',
gender: 'M',
zipCode: '9384983',
salary: 120000,
});
model() {
return this.person
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('person', this.person);
controller.set('value', this.value);
}
}
app/controllers/test2.js
JavaScript
import Ember from 'ember';
import EmberObject from '@ember/object';
export default Ember.Controller.extend({
actions: {
change(data) {
this.person.set('age', data);
},
remove() {
this.person.removeObserver('age', this.person, 'change');
console.log('Observer Removed!!!')
}
}
});
app/templates/test2.hbs
HTML
{{page-title "ArrayProxy"}}
<table>
<h1>Employee's Details: </h1>
<div><b>Name:</b> {{this.person.fullName}}</div>
<div><b>Gender:</b> {{this.person.gender}}</div>
<div><b>Country:</b> {{this.person.country}}</div>
<div><b>Salary:</b> {{this.person.salary}}</div>
<div><b>Zip Code:</b> {{this.person.zipCode}}</div>
<div><b>Language Speaks:</b>{{this.person.language}}</div>
<div><b>Mobile No.:</b>{{this.person.mobile}}</div>
<div><b>Age:</b> {{this.person.age}}</div>
</table>
<br />
{{input value=this.value}}
<br/>
<input
type="button"
id="Change"
value="Change Age"
{{action 'change'this.value}}
><br/><br/>
<input
type="button"
id="remove"
value="Remove Observer"
{{action 'remove'}}
>
{{outlet}}
Output:
removeObserver output2
Reference: https://api.emberjs.com/ember/4.9/classes/ArrayProxy/methods/removeObserver?anchor=removeObserver