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 decrementProperty() method is used to set the value of the property to the current value minus some amount.
Syntax:
decrementProperty( keyName, decrement );
Parameters:
- keyName: It is the name of the property whose value we want to decrement.
- decrement: It is the value to which we want to decrement.
Return Value: The new property value.
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 decrementP1
app/routes/decrementP1.js
import Route from '@ember/routing/route';
import EmberObject from '@ember/object';
export default class WebsitesRoute extends Route {
food = [
EmberObject.create({
food: 'apple',
isFruit: true,
quant: 3,
}),
EmberObject.create({
food: 'Potato',
isFruit: false,
quant: 4,
}),
EmberObject.create({
food: 'Banana',
isFruit: true,
quant: 2,
}),
EmberObject.create({
food: 'Burgur',
isFruit: false,
quant: 2,
}),
EmberObject.create({
food: 'Orange',
isFruit: true,
quant: 7,
}),
];
temp;
model() {
return this.food;
}
setupController(controller, model) {
super.setupController(controller, model);
controller.set('food', this.food);
controller.set('temp', this.temp);
controller.set('food2', this.food2);
}
} |
app/controllers/decrementP1.js
import Ember from 'ember';
export default Ember.Controller.extend({
value: 0,
actions: {
remove_item(item) {
this.food.set('[]', this.food.without
(this.food.findBy('food', item)));
},
list() {
let ans = '';
this.food.forEach((item) => ans +=
item.get('food') + '\n');
alert(ans)
},
increase() {
this.food.forEach((item) =>
item.incrementProperty('quant'));
},
decrease() {
this.food.forEach((item) =>
item.decrementProperty('quant'));
},
},
}); |
app/templates/decrementP1.hbs
{{page-title "decrementProperty"}}
<h3>List of Item in Buckets</h3>
<table> <tr>
<th> Food_Name </th>
<th>Bucket </th>
<th>Fruit </th>
</tr>
{{#each @model as |website|}}
<tr>
<td>{{website.food}}</td>
<td>{{website.quant}}</td>
<td>{{website.isFruit}}</td>
</tr>
{ {/each}}
</table> <br /> <div> <label>Enter value: </label>
{{input value=this.item}}
</div> <input type="button"
id="R-item"
value="Remove this item"
{{action "remove_item" this.item}}
/> <br /><br /> <input type="button" id="list-items" value="List All Items" {{action "list"}} />
<br /><br /> <input type="button"
id="increase-property"
value="Increase Quantity"
{{action "increase"}}
/> <br /><br /> <input type="button"
id="decrease-property"
value="dcrease Quantity"
{{action "decrease"}}
/> {{outlet}} |
Output: Visit localhost:4200/decrementP1 to view the output.
Ember.js ObjectProxy decrementProperty() Method
Example 2: Type the following code to generate the route for this example:
ember generate route decrementP2
app/routes/decrementP2.js
import Route from '@ember/routing/route';
import EmberObject from '@ember/object';
import { } from '@ember/array';
export default class FruitsRoute extends Route {
students = [
EmberObject.create({ name : 'Rahul',
Class : 11, marks : 75}),
EmberObject.create({name : 'Sam',
Class : 12,marks : 59}),
EmberObject.create({name : 'David',
Class : 11,marks : 67}),
EmberObject.create({name : 'Druv',
Class : 12,marks : 44}),
EmberObject.create({name : 'Mahan',
Class : 12,marks : 87}),
EmberObject.create({name : 'Ram',
Class : 11,marks : 71}),
EmberObject.create({name : 'Dadu',
Class : 12,marks : 58})
];
model() {
return this.students;
}
setupController(controller,model) {
super.setupController(controller, model);
controller.set('students', this.students);
}
} |
app/controllers/decrementP2.js
import Ember from "ember";
import { isAny, isEvery } from "@ember/array";
export default Ember.Controller.extend({
actions: {
increase(data) {
this.students.forEach((item) =>
item.incrementProperty('marks', JSON.parse(data)));
},
decrease(data) {
this.students.forEach((item) =>
item.decrementProperty('marks', JSON.parse(data)));
},
remove(item) {
this.students.set('[]',
this.students.without(this.students.findBy
('name', item)));
},
show_first() {
let ans = this.students.get('firstObject');
alert(ans.name)
},
show_last() {
let ans = this.students.get('lastObject');
alert(ans.name)
},
},
}); |
app/templates/decrementP2.hbs
{{page-title "decrementProperty"}}
<h3>Students List: </h3> <table> <tr>
<th>Name</th>
<th>Class</th>
<th>Marks</th>
</tr>
{{#each @model as |detail|}}
<tr>
<td>{{detail.name}}</td>
<td>{{detail.Class}}</td>
<td>{{detail.marks}}</td>
</tr>
{{/each}}
</table> <br /> <div> <label>Enter value: </label>
{{input value=this.item}}
</div> <input type="button"
id="increase-marks"
value="Increase All marks by Value"
{{action "increase" this.item}}
/> <br /><br /> <div> label>Enter value: </label>
{{input value=this.item2}}
</div> <input type="button"
id="decrease-marks"
value="decrease All marks by Value"
{{action "decrease" this.item2}}
/> <br /><br /> <div> <label>Enter Name: </label>
{{input value=this.item3}}
</div> <input type="button"
id="remove-student"
value="Remove Student"
{{action "remove" this.item3}}
/> <br /><br /> <input type="button"
id="first-student"
value="Show First Student in list"
{{action "show_first"}}
/> <br /><br /> <input type="button"
id="last-student"
value="Show Last Student in list"
{{action "show_last"}}
/> {{outlet}} |
Output: Visit localhost:4200/decrementP2 to view the output.
Ember.js ObjectProxy decrementProperty() Method