Ember.js ArrayProxy decrementProperty() Method

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 a property whose value we want to decrement.
• decrement: It is the amount by which property will decrement.

Return Value: The new property value.

Steps to Install and Run Ember.js:

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

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 decrement1

app/controllers/decrement1.js

import Ember from 'ember';
import { decrementProperty }
    from '@ember/array';

export default Ember.Controller.extend({
    year: 2022,
    month: 9,
    date: 15,
    actions: {
        olderD() {
            this.incrementProperty('date');
        },
        youngerD() {
            this.decrementProperty('date');
        },
        olderY() {
            this.incrementProperty('year');
        },
        youngerY() {
            this.decrementProperty('year');
        },
        olderM() {
            this.incrementProperty('month');
        },
        youngerM() {
            this.decrementProperty('month');
        },
    },
});

app/templates/decrement1.hbs

{{page-title "DecrementProperty"}}
<h1>Year {{this.year}}</h1>
<input type="button" id="increase"
    value="+" {{action 'olderY'}}/>
<input type="button" id="decrease"
    value="-" {{action 'youngerY'}}/>
<hr/>
<h1>Month {{this.month}}</h1>
<input type="button" id="increase"
    value="+" {{action 'olderM'}}/>
<input type="button" id="decrease"
    value="-" {{action 'youngerM'}}/>
<hr/>
<h1>Date {{this.date}}</h1>
<input type="button" id="increaseD"
    value="+" {{action 'older'}}/>
<input type="button" id="decrease"
    value="-" {{action 'youngerD'}}/>
{{outlet}}

Output: Visit localhost:4200/decrement1 to view the output

Ember.js ArrayProxy decrementProperty method

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

ember generate route decrement2

app/routes/decrement2.js

import Route from '@ember/routing/route';

export default class WebsitesRoute extends Route {
    food = [
        {
            food: 'apple',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'Potato',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'Banana',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'Burgur',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'Orange',
            isFruit: true,
            quant: '1',
        },
        {
            food: 'sandwitch',
            isFruit: false,
            quant: '2',
        },
        {
            food: 'bean',
            isFruit: false,
            quant: '2',
        },
    ];
    temp;
    model() {
        return this.food;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('food', this.food);
        controller.set('temp', this.temp);
        controller.set('temp2', this.temp2);
    }
}

app/controllers/decrement2.js

import Ember from 'ember';

export default Ember.Controller.extend({
    value: 0,
    actions: {
        older() {
            this.incrementProperty('value');
        },
        younger() {
            this.decrementProperty('value');
        },

        addItem(data, data1, data2) {
            let temp = {
                food: data,
                quant: data1,
                isFruit: data2
            }
            this.food.addObject(temp)
        },
    },
});

app/templates/decrement2.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 |i|}}
    <tr>
        <td>{{i.food}}</td>
        <td>{{i.quant}}</td>
        <td>{{i.isFruit}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />

<div>
    <label>Enter Item Name: </label>
    {{input value=this.temp2}}
</div>
<br />

<div>
    <label>Enter Quantity in Kg: </label>
    {{input value=this.value}}
</div>
<input type="button" id="increase"
    value="+" {{action 'older'}}/>
<input type="button" id="decrease"
    value="-" {{action 'younger'}}/>
<br/>
<br />

<div>
    <label>Item is fruit of not : </label>
    {{input value=this.temp}}
</div>
<br /><br />
<input type="button" id="all-Fruits"
    value="Add item"
    {{action 'addItem' this.temp2 this.value this.temp}} />
{{outlet}}

Output: Visit localhost:4200/decrement2 to view the output

Ember.js ArrayProxy decrementProperty method

Reference: https://api.emberjs.com/ember/4.6/classes/ArrayProxy/methods/decrementProperty?anchor=decrementProperty