Ember.js Component incrementProperty() 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 incrementProperty() method is used to increase the value of property to some amount.

Syntax:

incrementProperty(keyName,increment);

Parameters:

• keyName: It is the name of the property whose value we want to decrement.
• increment: It is the value to which we want to increment. The default value is 1.

Return Value: This method returns a new property value.

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 increment1

app/components/compact.js

Javascript

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';

import { action, incrementProperty,
    defineProperty } from '@ember/object';
import EmberObject from '@ember/object';

const Food = EmberObject.extend({
    toStringExtension() {
        return this.get('food');
    }
});

export default class extends Component {
    @tracked
    value = Food.create({
        value: 0,
    });
    food = [
        Food.create({
            food: 'apple',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'Potato',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'Banana',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'Burgur',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'Orange',
            isFruit: true,
            quant: '1',
        }),
        Food.create({
            food: 'sandwitch',
            isFruit: false,
            quant: '2',
        }),
        Food.create({
            food: 'bean',
            isFruit: false,
            quant: '2',
        }),
    ];

    older() {
        this.value.incrementProperty('value');
    }
    younger() {
        this.value.decrementProperty('value');
    }

    addItem(data, data1, data2) {

        let temp = Food.create({
            food: data,
            isFruit: data1,
            quant: data2
        });
        alert(temp.toString() + ' Created');
        this.food.addObject(temp);
    }
}

app/components/compact.hbs

HTML

{{page-title "incrementProperty"}}
<h3>{{yield}}</h3>

<table>
    <tr>
        <th> Food Name </th>
        <th>Bucket </th>
        <th>Fruit </th>
    </tr>
    {{#each this.food as |website|}}
    <tr>
        <td>{{website.food}}</td>
        <td>{{website.quant}}</td>
        <td>{{website.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.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 or 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}}

app/templates/increment.hbs

HTML

<Compact>
    List of Item in Buckets
</Compact>


{{outlet}}

Output:

decrementProperty output1

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

ember generate route increment2

app/components/compact2.js

Javascript

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';
import EmberObject from '@ember/object';

const Student = EmberObject.extend({
    toStringExtension() {
        return this.get('food');
    }
});
export default class extends Component {
    @tracked
    val1 = Student.create({
        class: 10,
        age: 15,
    })
    student = [
        Student.create({
            Name: 'Aarbh',
            class: 12,
            age: 18,
        }),
        Student.create({
            Name: 'viky',
            class: 9,
            age: 15,
        }),
        Student.create({
            Name: 'Chiku',
            class: 8,
            age: 11,
        }),
        Student.create({
            Name: 'Nikki',
            class: 11,
            age: 17,
        }),
        Student.create({
            Name: 'Ankit',
            class: 8,
            age: 14,
        }),
        Student.create({
            Name: 'Sonam',
            class: 11,
            age: 17,
        }),
        Student.create({
            Name: 'Ravi',
            class: 10,
            age: 16,
        }),
    ];
    older(data) {
        this.val1.incrementProperty(data);
    }
    younger(data) {
        this.val1.decrementProperty(data);
    }

    addItem(data, data1, data2) {

        let temp = Student.create({
            Name: data,
            class: data1,
            age: data2
        });
        alert(temp.toString() + ' Student Added in list');
        this.student.addObject(temp);
    }
}

app/components/compact2.hbs

HTML

{{page-title "incrementProperty"}}
<h3>{{yield}}</h3>

<table>
    <tr>
        <th> Name </th>
        <th>Class </th>
        <th>Age </th>
    </tr>
    {{#each this.student as |website|}}
    <tr>
        <td>{{website.Name}}</td>
        <td>{{website.class}}</td>
        <td>{{website.age}}</td>
    </tr>
    {{/each}}
</table>
<br /><br />

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

<div>
    <label>Enter Age: </label>
    {{input value=this.val1.age}}
</div>
<input type="button" id="increase"
       value="+" {{action 'older' 'age' }} />
<input type="button" id="decrease"
       value="-" {{action 'younger' 'age' }} />
<br />
<br />


<div>
    <label>Enter Class: </label>
    {{input value=this.val1.class}}
</div>
<input type="button" id="increase"
       value="+" {{action 'older' 'class' }} />
<input type="button" id="decrease"
       value="-" {{action 'younger' 'class' }} />
<br />
<br />

<br /><br />
<input type="button" id="all-Fruits" value="Add item"
       {{action 'addItem' this.temp2 this.class this.age}} />


{{outlet}}

app/templates/decrement2.hbs

HTML

<Compact2>
    List of Item in Buckets
</Compact2>


{{outlet}}

Output:

decrementProperty output2

Reference: https://api.emberjs.com/ember/4.4/classes/Component/methods/incrementProperty?anchor=incrementProperty