Ember.js Controller actions Property

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 action() method is used to create the function that will be invoked when a matching action is triggered from within templates and that application’s current route is this route.

Syntax:

action:{ // functions };

Parameters: 

• functions: These are the functions that are invoked when a matching action will trigger from within templates. 

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 action1

app/controllers/action1.js

Javascript

import Controller from '@ember/controller';
import { action, find } from '@ember/object';

import Ember from 'ember'
let Student = Ember.Object.extend({

    // These will be supplied by `create`
    firstName: null,
    lastName: null,

    fullName: Ember.computed('firstName', 'lastName', function () {
        return `${this.get('firstName')} ${this.get('lastName')}`;
    }),

    Changed: Ember.observer('fullName', function () {
        console.log(`fullName changed to: ${this.get('fullName')}`);
    })
});

export default class Array2Controller extends Controller {

    stu2 = Student.create({
        firstName: 'Kasual',
        lastName: 'Singh',
        Id: 'stu2'
    });
    stu0 = Student.create({
        firstName: 'Yehuda',
        lastName: 'Katz',
        Id: 'stu0'
    });
    stu1 = Student.create({
        firstName: 'Yella',
        lastName: 'melo',
        Id: 'stu1'
    });
    stu3 = Student.create({
        firstName: 'Pokhu',
        lastName: 'Verma',
        Id: 'stu3'
    });
    value = this.stu3.get('Id');
    students = [this.stu0, this.stu1, this.stu2, this.stu3]
    @action
    print(data1, data2) {
        let ans = this.students.findBy('Id', data1)
        ans.set('firstName', data2)
    }
}

app/templates/action1.hbs

HTML

<table>
    <tr>
        <th>Name</th>
        <th>Id</th>
      </tr>
      {{#each this.students as |detail|}}
    <tr>
        <td>{{detail.fullName}}</td>
          <td>{{get detail "Id"}}</td>
    </tr>
      {{/each}}
</table>
<br />
{{input value=this.value}}
{{input value=this.value2}}
<br />
<input
    type="button"
      id="set-code"
      value="Update Student details"
      {{action "print" this.value this.value2}}
/>

Output:

Ember.js Controller actions Property

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

ember generate route action2

app/routes/action2.js

Javascript

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

export default class StudentsRoute extends Route {
    p1 = [
        'Digital Camera',
        'Jugs, cups & straws',
        'Balloons',
        'Scissors',
        'Cold Drink',
        'Table',
    ];
    model() {
        return this.p1;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('p1', this.p1);
    }
}

app/controllers/action2.js

Javascript

import Ember from 'ember';

export default Ember.Controller.extend({
    value: 'value',
    init() {
        this._super(...arguments);
        this.addObserver('value', this, 'Change');
    },

    Change() {
        console.log('value changed');
    },
    actions: {
        remove(data) {
            this.p1.set('[]', this.p1.without(data));
        },
        print() {
            let ans = this.p1.set('[]');
            alert(ans.join('\n'))
        },
    },
});

app/templates/action2.hbs

HTML

<ul>
<h3>List is  : </h3>
    {{#each @model as |party|}}
        <li>{{party}}</li>
    {{/each}}
</ul>
<br />
{{input value=this.value}}
<br/>
<input
    type="button"
    id="check-atIndex"
    value="Remove"
    {{action 'remove' this.value}}
/>
<br/><br/>
<input
    type="button"
    id="print-item"
    value="Print All Items"
    {{action 'print' this.value}}
/>

Output:

Ember.js Controller actions Property

Reference: https://api.emberjs.com/ember/4.6/classes/Controller/properties/actions?anchor=actions