Ember.js Component classNames Property

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 many websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The classNames of the Component class are the property that is used to define the standard class name to the view’s outer element. By default, this property automatically gets the name from the view’s superclasses.

Syntax: 

classNames: NameOfClass ; 

Parameters: 

• NameOfClass: It is the name of the class that will assist with the view element. 

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 server

Example 1: In this example, we will create a component and bind that component element with the class Name ‘component’ and see some effect on the CSS class. Type the following code to generate the route for this example:

ember generate route file1

app/components/third.js

Javascript

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

export default Ember.Component.extend({
    classNames: ['component'],
});

app/components/third.hbs

HTML

{{page-title "Component className"}}

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

app/templates/file1.hbs

HTML

<h1>GeeksforGeeks</h1>
<h2>This is main templates class</h2>
<Third>
    This is Component Using Class Name.
</Third>

app.css

CSS

h1{
    font-family:  Tahoma, Geneva, Verdana, sans-serif;
    font-size: 25pt;
    color:#2fd778
}
 .component{
    font-family: arial, Verdana, sans-serif;
    font-size: 25pt;
    color:#1bd09d

}

Output:

output1

Example 2: In this example, we will define classNames in a javascript file and define inline className to component element. 

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

ember generate route file2

app/components/fourth.js

Javascript

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

export default Ember.Component.extend({
    classNames: ['component'],
});

app/components/fourth.hbs

HTML

{{page-title "Component className"}}

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

app/templates/file2.hbs

HTML

<h1>GeeksforGeeks</h1>
<h2>This is main templates class</h2>
<Fourth @classNames="Second">
    This is Component Using Class Name.
</Fourth>

app.css

CSS

h1{
    font-family:  Tahoma, Geneva, Verdana, sans-serif;
    font-size: 25pt;
    color:#2fd778
}
 .component{
    font-family: arial, Verdana, sans-serif;
    font-size: 25pt;
    color:#1bd09d

}

.Second{
    font-family: arial, Verdana, sans-serif;
    font-size: 25pt;
    color:#011416

}

Output:

output2

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