Ember.js Observable get() Method
Last Updated :
02 Dec, 2022
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.
The get() method is used to obtain a property’s value from the object. This method is similar to object.keyName and it supports both computed properties and unknownProperty handler.
Syntax:
get( keyName );
Parameters:
- key: The property name which is to be retrieved.
Return value: This method returns property value or undefined if the key doesn’t exist.
Steps to Install and Run Ember.js:
Step 1: To run the following examples, you need to have an ember project. 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 get1
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);
},
@action
removeItem(data) {
this .fruits.set( '[]' , this .fruits.without
( this .fruits.findBy( 'color' , data)));
},
})
|
app/components/arr.hbs
HTML
< 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 >
< br />
{{outlet}}
|
app/templates/get1.hbs
HTML
< Arr >
List of Fruits:
</ Arr >
|
Output:
get output1
Example 2: Type the following code to generate the route for this example:
ember generate route get2
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({
Name: null ,
skill: null ,
id: null ,
init() {
alert(`${ this .get( 'Name' )} 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: [{
Name: 'Balit stark' ,
skill: 'Python' ,
Id: 'stu2' ,
},
{
Name: 'Permu scott' ,
skill: 'PHP' ,
Id: 'stu0' ,
},
{
Name: 'Sam melo' ,
skill: 'R' ,
Id: 'stu1' ,
},
{
Name: 'Pokhu Verma' ,
skill: 'JavaScript' ,
Id: 'stu3' ,
},
{
Name: 'Tanu Agrawal' ,
skill: 'Java' ,
Id: 'stu4' ,
},
{
Name: 'Arabh Singh' ,
skill: 'c++' ,
Id: 'stu5' ,
}],
@tracked
item3: 'Gulshan' ,
@tracked
item2: 'Angular' ,
@tracked
item1: 'stu6' ,
@tracked
item4: 'Sam' ,
@action
print(data1, data2, data3) {
let temp = Student.create({
Name: data1,
skill: data2,
Id: data3
});
this .students.addObject(temp);
},
@action
removeItem(data) {
this .students.set( '[]' , this .students.without
( this .students.findBy( 'Name' , data)));
}
})
|
app/components/arr2.hbs
HTML
< h3 >{{yield}}</ h3 >
< table >
< tr >
< th >Name</ th >
< th >Id</ th >
</ tr >
{{#each this.students as |detail|}}
< tr >
< td >{{detail.Name}}</ 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}}
/>
< br />
{{outlet}}
|
app/templates/get2.hbs
HTML
< Arr2 >
List of Students:
</ Arr2 >
|
Output:
get output2
Reference: https://api.emberjs.com/ember/4.6/classes/Observable/methods/get?anchor=get
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