Ember.js Component classNameBindings Property

Ember.js is an open-source JavaScript framework used for developing sizeable 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 many websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The classNameBindings property of the component class is used for applying the list of properties as class names. If the property is a string value, the value of the string is applied as the class name. 

Syntax: 

classNameBindings:  properties ;

Parameters:

• properties: It is a list of properties that are assigned as class names to component elements in DOMs.

Steps to install and run ember: 

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 file1

app/components/first.js

Javascript

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

export default Ember.Component.extend({

    tagName: 'section',
    classNameBindings: ['Name'],
    Name: 'component',

    @tracked
    name: 'Satyam Thakur',
    @tracked
    gender: 'M',
    @tracked
    occupation: 'Lawyer',
    @tracked
    salary: 87000,
    @tracked
    mobile: 8374847388,
    @tracked
    email: 'satyamthakur@gmail.com'



})

app/components/first.hbs

HTML

{{page-title "Component attributeBindings"}}
{{yield}}
<div>
    <label>Name:</label>
    {{this.name}}
</div>
<div>
    <label>Gender:</label>
    {{this.gender}}
</div>
<div>
    <label>Occupation:</label>
    {{this.occupation}}
</div>
<div>
    <label>Salary:</label>
    {{this.salary}}
</div>
<div>
    <label>Mobile:</label>
    {{this.mobile}}
</div>
<div>
    <label>Email:</label>
    {{this.email}}
</div>

{{outlet}}

app/templates/file1.hsb

HTML

<First>
    <h1>
    GEEK's Details:
    </h1>
</First>

app.css

CSS

h1{
    font-family:  Tahoma, Geneva, Verdana, sans-serif;
    font-size: 25pt;
    color:#2fd778
}

.component{
    font-family: papyrus;
    font-size: 15pt;
}

Output: Here We define the class Name “component” to the component element in DOM and set some CSS property to that class Name. 

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

ember generate route file2

app/components/second2.js

Javascript

import Component from '@glimmer/component';
import Ember from 'ember';

export default Ember.Component.extend({
    tagName: 'div',
    classNameBindings: ['temp'],
    temp: 'tutorial',

})

app/components/second2.hbs

HTML

{{page-title "Component attributeBindings"}}

<h3>{{yield}}</h3>

app/templates/file2.hbs

HTML

<h1>GeeksForGeeks</h1>
<Second >
    Person:
    {{input value='Satyam'}}
    {{input value='Software Engineer'}}
</Second>

<Second @classNames="component" >
    Person:
    {{input value='Lisa'}}
    {{input value='Lawyer'}}
</Second>

<Second >
    Person:
    {{input value='Somaya'}}
    {{input value='Doctor'}}
</Second>

app.css

CSS

h1{
    font-family:  Tahoma, Geneva, Verdana, sans-serif;
    font-size: 25pt;
    color:#2fd778
}

.tutorial{
    font-family: papyrus;
    font-size: 15pt;
    background-color: #044a5f
}
.component{
    font-family: papyrus;
    font-size: 15pt;
    background-color: #68ceec;
}

Output: Here we will see inline class names have more priority or classNameBindings. 

Output2

Reference: https://api.emberjs.com/ember/4.9/classes/Component/properties/classNameBindings?anchor=classNameBindings