Getting started in EJ2 TypeScript Radio button control

29 Jul 20267 minutes to read

This section explains how to create a simple Radio button, and configure its available functionalities in TypeScript, using Essential® JS 2 quickstart seed repository. This seed repository is pre-configured with the Essential® JS 2 package.

This application is integrated with the webpack.config.js configuration and uses the latest version of the webpack-cli. It requires node v14.15.0 or higher. For more information about webpack and its features, refer to the webpack documentation.

Prerequisites

Ensure the following tools are installed on your machine:

Set up the development environment

Clone the Syncfusion® TypeScript (Essential® JS 2) quickstart project from GitHub in the command prompt:

git clone https://github.com/SyncfusionExamples/ej2-quickstart-webpack ej2-quickstart

Navigate to the project folder in the command prompt:

cd ej2-quickstart

Install Syncfusion® Radio button package

Syncfusion® TypeScript (Essential® JS 2) packages are available on the npmjs.com public registry. You can install all Syncfusion® TypeScript (Essential® JS 2) controls in a single @syncfusion/ej2 package or individual packages for each control.

Use the following command to install the @syncfusion/ej2-buttons package:

npm install @syncfusion/ej2-buttons --save

Then, install the remaining dependent npm packages using the following command:

npm install

For more information about individual package and alternative installation methods, see the installation guide.

Import Syncfusion® Radio button CSS styles

Syncfusion® JavaScript controls provide built-in themes, which are available from the npm theme packages. Additionally, themes can be loaded via CDN or customized using the Theme Studio. For more information, refer to the themes documentation.

The quickstart application is preconfigured to use the Fluent2 theme. To install the Fluent2 theme package, use the following command:

npm install @syncfusion/ej2-fluent2-theme --save

The required styles are imported in the ~/src/styles/styles.css file, as shown below:

@import "../../node_modules/@syncfusion/ej2-fluent2-theme/styles/radio-button/index.css";

Learn more about built-in themes and individual control CSS references.

Add Syncfusion® Radio button control to the application

The Radio button can be initialized through input tags.

Add the HTML input element which needs to be initialized as Radio button in index.html.

Open the application in Visual Studio Code and add the Syncfusion® TypeScript UI controls.

In this article, the Radio button control is used as an example. Add the following Radio button element to the ~/src/index.html file.

<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
    <meta name="description" content="Essential JS 2" />
    <meta name="author" content="Syncfusion" />
    <link rel="shortcut icon" href="resources/favicon.ico" />
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
</head>

<body>
    <div>
        <!--element which is going to render-->
        <input id="element" type="radio"/>
    </div>

</body>

</html>

Now, to render the Radio button control, add the following TypeScript code to the ~/src/app/app.ts file.

import { RadioButton } from '@syncfusion/ej2-buttons';

// Initialize RadioButton component.
let radiobutton: RadioButton = new RadioButton({ label: 'Default'});

// Render initialized RadioButton component.
radiobutton.appendTo('#element');

Run the application

Now, run the application in the browser using the following command.

npm run start

The following example shows a basic RadioButton component:

import { RadioButton } from '@syncfusion/ej2-buttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

// Initialize RadioButton component.
let radiobutton: RadioButton = new RadioButton({ label: 'Option 1', name: 'default'});

// Render initialized RadioButton.
radiobutton.appendTo('#element1');

radiobutton = new RadioButton({ label: 'Option 2', name: 'default', checked: true});
radiobutton.appendTo('#element2');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 RadioButton</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="https://cdn.syncfusion.com/ej2/34.1.29/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/34.1.29/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <input type='radio' id='element1'/>
        <input type='radio' id='element2'/>
    </div>
</body>

</html>

Change the RadioButton state

The Essential® JS 2 RadioButton contains 2 states visually, they are as follows:

  • Checked
  • Unchecked

The RadioButton checked property is used to handle the checked and unchecked state. In the checked state an inner circle will be added to the visualization of RadioButton.

import { RadioButton } from '@syncfusion/ej2-buttons';
import { enableRipple } from '@syncfusion/ej2-base';

enableRipple(true);

//checked state.
let radiobutton: RadioButton = new RadioButton({ label: 'Option 1', name: 'state', checked: true });
radiobutton.appendTo('#radiobutton1');

//unchecked state.
radiobutton = new RadioButton({ label: 'Option 2', name: 'state' });
radiobutton.appendTo('#radiobutton2');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 RadioButton</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="https://cdn.syncfusion.com/ej2/34.1.29/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/34.1.29/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <ul>
            <li><input type="radio" id="radiobutton1" /></li>
            <li><input type="radio" id="radiobutton2" /></li>
        </ul>
    </div>
</body>

</html>

See Also