Step-by-Step Guide to Create Digital Signatures with React Native Signature Canvas

React Native Signature Canvas provides a great way to digitally create signature using a canvas. It enables us to add signature fields to our forms that can be used to sign documents. In this tutorial, we will learn how we can implement signature fields using React Native Signature Canvas.

Overview

React Native Signature Canvas is a canvas-based signature drawing component. It is an open-source library developed by Mark Basha and is available on Github under MIT License. It provides us with a simple and efficient way to add signature fields in our web forms.

The library can also be used to generate high-res images for signature, display signature fields with customizable styling and validate signature inputs.

prerequisites

Before we can start to work with React Native Signature Canvas, we will need to have the following prerequisites:

• React Native CLI installed
• Node.js installed
• NPM installed

Installation

To install React Native Signature Canvas, run the following command on your terminal:

npm install --save react-native-signature-canvas

Implementation

1.Create a new project using React Native CLI.

2.Import the Component from the react-native-signature-canvas library

import SignatureCapture from ‘react-native-signature-canvas’;

3.Create a state to capture the signature in the imported SignatureCapture Component

this.state = {
  signature: null
};

4.Define the SignatureCapture component in the render method of your component.

<SignatureCapture
  onSaveEvent={this.onSaveEvent}
  onDragEvent={this.onDragEvent}
/>

1. Define an onSaveEvent handler to capture the value of the signature

onSaveEvent = () => {
  // captures signature value
  this.refs["sign"].saveImage();
}

5.Now, we will store the signature in the signature state using the ktfGetSignature method, which will return the signature as an encoded string.

ktfGetSignature = () => {
  // get signature value
  this.refs["sign"].getSignature();
}

onSaved = (result) => {
  this.setState({ signature: result.encoded })
}

6.Update state on each drag event to keep track of the signatures progress

onDragEvent = () => {
  this.refs["sign"].getSigned();
}

onSigned = (result) => {
  this.setState({ signature: result.encoded });
}

7.Add optional styling props to customise

<SignatureCapture
  clearText=" Clear "
  confirmText=" Save "
/>

Conclusion

We have now successfully implemented signature fields using React Native Signature Canvas. With this library, we can easily generate high-res images of the signatures, validate and customise the design of the signature fields.

FAQ

What is React Native Signature Canvas?

React Native Signature Canvas is a canvas-based library for digitally creating signatures with React Native. It is an open-source library available on Github under MIT License.

What benefits does React Native Signature Canvas provide?

React Native Signature Canvas provides us with a simple and efficient way to add signature fields in our web forms. It also provides us with the ability to generate high-res images for signatures, customise the styling of the signature fields and validate signature inputs.

How easy is it to use React Native Signature Canvas?

React Native Signature Canvas is easy to use and has a simple setup process. It only takes a few lines of code to implement signature fields using this library.

How can I get access to React Native Signature Canvas?

React Native Signature Canvas is open-source and available on Github under MIT License. It can be installed simply using npm.

Is React Native Signature Canvas secure?

Yes, React Native Signature Canvas is a secure library and is suitable for use in production.

Resources

• Official React Native Documentation