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Getting started in EJ2 TypeScript Signature control

10 Feb 20266 minutes to read

This section explains how to create a simple Signature component and configure its available functionalities in TypeScript, using Essential® JS 2 quickstart seed repository.

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.

Dependencies

The following list of dependencies are required to use the Signature component in your application.

|-- @syncfusion/ej2-inputs
    |-- @syncfusion/ej2-base

Setup development environment

Open the command prompt from the required directory, and run the following command to clone the Syncfusion® JavaScript (Essential® JS 2) quickstart project from GitHub.

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

After cloning the application in the ej2-quickstart folder, run the following command line to navigate to the ej2-quickstart folder.

cd ej2-quickstart

Add Syncfusion® JavaScript packages

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

The quickstart application is preconfigured with the dependent @syncfusion/ej2 package in the ~/package.json file. Use the following command to install the dependent npm packages from the command prompt.

npm install

Import the Syncfusion® CSS styles

Syncfusion® JavaScript controls come with built-in themes, which are available in the installed packages. It’s easy to adapt the Syncfusion® JavaScript controls to match the style of your application by referring to one of the built-in themes.

The quickstart application is preconfigured to use the Material theme in the ~/src/styles/styles.css file, as shown below:

@import "../../node_modules/@syncfusion/ej2-base/styles/material.css";

You can check out the themes section to know more about built-in themes and CSS reference for individual controls.

Adding Signature component to the application

Add the HTML Canvas tag with the id attribute as signature to your index.html file.

[src/index.html]

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

<head>
    <title>Essential JS 2 - Signature</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 - Signature" />
    <meta name="author" content="Syncfusion" />
    <link rel="shortcut icon" href="resources/favicon.ico" />
</head>

<body>
    <div id="signature-control">
        <canvas id="signature"></canvas>
    </div>
</body>
</html>

Import the Signature component in your app.ts file and initialize it with the #signature element.

[src/app/app.ts]

import { Signature } from '@syncfusion/ej2-inputs';

// Initialize the Signature component
let signature: Signature = new Signature({}, '#signature');

Run the application

Run the application in the browser using the following command:

npm start

The following example shows a basic Signature component.

import { Signature } from '@syncfusion/ej2-inputs';

// Initializes the ColorPicker component
let signature: Signature = new Signature({}, '#signature');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Signature</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="TypeScript Signature Component" />
    <meta name="author" content="Syncfusion" />
    <link href="styles.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/32.2.3/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="https://cdn.syncfusion.com/ej2/32.2.3/ej2-inputs/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>
<body>
    <div id='loader'>Loading....</div>
    <div id='container'>
        <h4>Sign here</h4>
        <div id ="signature-control">
            <canvas id="signature"></canvas>
        </div>
    </div>
</body>
</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

#signature {
  border: 1px solid lightgray;
  height: 100%;
  width: 100%;
}

#signature-control {
  height: 300px;
  width: 550px;
}

The Signature control will render default height and width of canvas (300 * 150), when the Signature height and width are not specified.