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Getting started with JavaScript Signature control

02 Dec 2022 / 2 minutes to read

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

Dependencies

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

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|-- @syncfusion/ej2-base

Setup your development environment

To get started with the Signature component, clone Essential JS 2 quickstart, and install the npm packages using the following commands.

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git clone https://github.com/syncfusion/ej2-quickstart.git quickstart
cd quickstart
npm install

The project is preconfigured with common settings (src/styles/styles.css, system.config.js) to start all the Essential JS 2 components.

[src/system.config.js]

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System.config({
paths: {
    'npm:': './node_modules/',
    'syncfusion:': 'npm:@syncfusion/'
},
map: {
    app: 'app',

    //Syncfusion packages mapping
    "@syncfusion/ej2-base": "syncfusion:ej2-base/dist/ej2-base.umd.min.js",
    "@syncfusion/ej2-inputs": "syncfusion:ej2-inputs/dist/ej2-inputs.umd.min.js",
},
packages: {
    'app': { main: 'app', defaultExtension: 'js' }
}
});

System.import('app.ts').catch(console.error.bind(console)).then(function () {
document.getElementById('loader').style.display = "none";
document.getElementById('container').style.visibility = "visible";
});

Adding Style sheet to the Application

To render Signature component, need to import inputs and its dependent components styles as given below in styles.css.

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

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]

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<!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" />

<!--style reference from app-->
<link href="/styles/styles.css" rel="stylesheet" />

<!--system js reference and configuration-->
<script src="node_modules/systemjs/dist/system.src.js" type="text/javascript"></script>
<script src="system.config.js" type="text/javascript"></script>
</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.

[src/app/app.ts]

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

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

Run the application

Run the application in the browser using the following command:

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npm start

The following example shows a basic Signature component.

Source
Preview
app.ts
index.html
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import { Signature } from '@syncfusion/ej2-inputs';

// Initializes the ColorPicker component
let signature: Signature = new Signature({}, '#signature');
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<!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="//cdn.syncfusion.com/ej2/20.3.56/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/20.3.56/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>
</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>

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