Ember.js Component toString() 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 toString() Method of the Component class is used to get a string representation of the object. This method is also used to get more information about the object. It shows the object’s class and if the class is not present in the namespace it shows it’s a subclass of the reregistered superclass. 

Syntax: 

this.object.toString( );

Parameters: It doesn’t take any parameters.

Returns: It returns string representation. 

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 test1

app/components/first.js

Javascript

import Component from '@glimmer/component';
import Ember from 'ember';
import EmberObject from '@ember/object';
import { action, without, set, get, computed }
    from '@ember/object';

let value = 0;
const Student = EmberObject.extend({
    describeSkill: computed('Name', 'skill', {
        get() {
            console.log('Computed property called for ',
                this.Name, value += 1)
            return `${this.Name} knows ${this.skill} language`;
        }
    }),

    toStringExtension() {
        return this.get('Name');
    },
});

export default Ember.Component.extend({
    students: [
        Student.create({
            Name: 'Balit',
            skill: 'Python',
            Id: 'stu2',
        }),
        Student.create({
            Name: 'Arabh',
            skill: 'c++',
            Id: 'stu5',
        }),
        Student.create({
            Name: 'Tanu',
            skill: 'Java',
            Id: 'stu4',
        }),
        Student.create({
            Name: 'Pokhu',
            skill: 'JavaScript',
            Id: 'stu3',
        }),
        Student.create({
            Name: 'Sam',
            skill: 'R',
            Id: 'stu1',
        }),
        Student.create({
            Name: 'Permu',
            skill: 'PHP',
            Id: 'stu0',
        }),
    ],

    @action
    StoreName(data) {
        this.students.forEach(function (item) {
            if (item.Name == data) {
                item.describeSkill
                let temp = item.cacheFor('describeSkill');
                console.log(`'${temp}' is stored
                    from ${item.toString()}`)
            }
        })
    }
});

app/components/first.hbs

HTML

{{page-title "Component toString"}}
<h3>List of Item in Buckets</h3>
<table>
    <tr>
        <th> Name </th>
        <th>Skill </th>
        <th>Id </th>
    </tr>
    {{#each this.students as |temp|}}
    <tr>
        <td>{{temp.Name}}</td>
        <td>{{temp.skill}}</td>
        <td>{{temp.Id}}</td>
    </tr>
    {{/each}}
</table>
<br />
<div>
    <label>Enter Name : </label>
    {{input value=this.item}}
</div><br />

<input
    type="button"
    id="Cache-property"
    value="Store the Computed Property"
    {{action "StoreName" this.item}}
/>
<br /><br />
{{outlet}}

app/templates/test1.hbs

HTML

<First>
    Example of Component toString method
</First>

Output:

Output1

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

ember generate route test2

app/components/test2.js

Javascript

import Component from '@glimmer/component';
import Ember from 'ember';
import EmberObject from '@ember/object';
import { action, without, set, get, computed }
    from '@ember/object';

let value = 0;
const Student = EmberObject.extend({
    fullName: computed('firstName', 'lastName', {
        get() {
            console.log(
                'Computed property called for ',
                this.firstName, value += 1
            )
            return `${this.firstName} ${this.lastName}`;
        }
    }),

    toStringExtension() {
        return this.get('fullName');
    },
});

export default Ember.Component.extend({
    students: [
        Student.create({
            firstName: 'Sam',
            lastName: 'Snehil',
            Marks: 72,
            class: 11,
        }),
        Student.create({
            firstName: 'Ram',
            lastName: 'Sahu',
            Marks: 84,
            class: 10,
        }),
        Student.create({
            firstName: 'Soham',
            lastName: 'Verma',
            Marks: 69,
            class: 12,
        }),
        Student.create({
            firstName: 'David',
            lastName: 'Tigga',
            Marks: 53,
            class: 9,
        }),
        Student.create({
            firstName: 'Pokhu',
            lastName: 'Verma',
            Marks: 95,
            class: 10,
        }),
        Student.create({
            firstName: 'Satyam',
            lastName: 'Verma',
            Marks: 75,
            class: 12,
        }),
    ],

    @action
    StoreName(data) {
        this.students.forEach(function (item) {
            if (item.fullName == data) {
                let temp = item.cacheFor('fullName');
                console.log(`${temp} is stored
                    from ${item.toString()}`)
            }
        })
    }
})

app/components/test2.hbs

HTML

{{page-title "Component toString"}}
<h3>List of Item in Buckets</h3>
<table>
    <tr>
        <th> Name </th>
        <th>Class </th>
        <th>Marks </th>
    </tr>
    {{#each this.students as |temp|}}
    <tr>
        <td>{{temp.fullName}}</td>
        <td>{{temp.class}}</td>
        <td>{{temp.Marks}}</td>
    </tr>
    {{/each}}
</table>
<br />
<div>
    <label>Enter Name : </label>
    {{input value=this.item}}
</div><br />

<input
    type="button"
    id="Cache-property"
    value="Store the Computed Property"
    {{action "StoreName" this.item}}
/>
<br /><br />
{{outlet}}

app/templates/test2.hbs

HTML

<Second>
    Example of Components toString method
</Second>

Output:

ouput2

Reference: https://api.emberjs.com/ember/4.9/classes/Component/methods/toString?anchor=toString