react-simple-captcha

React Simple Captcha

React Simple Captcha is a very powerful and easy to use captcha for React JS.

Demo Demo can be seen here.

Install

$ npm install react-simple-captcha

Usage Guide

Just follow these 6 easy steps to use the react simple captcha:

-  **Prerequisite** 
**react-html-parser** 

• Step 1 Install 'react-html-parser'

$ npm install react-html-parser

• Step 2 Import 'react-html-parser'

import ReactHtmlParser from 'react-html-parser'; 

**react-simple-captcha**

• Step 3 Import all functions from react-simple-captcha

import { loadcaptchaenginge, LoadCanvasTemplate, LoadCanvasTemplateNoReload, validateCaptcha } from 'react-simple-captcha';

• Step 4 Place LoadCanvasTemplate or LoadCanvasTemplateNoReload (if you do not want 'Reload Captcha' functionality) in your render code in the function ReactHtmlParser()

render() {
     return (<div>
         {ReactHtmlParser(LoadCanvasTemplate)}
         </div>);
 };

OR

render() {
     return (<div>
         {ReactHtmlParser(LoadCanvasTemplateNoReload)}
         </div>);
 };

• Step 5 Paste loadcaptchaenginge(6) (You can change 6 to number of captcha charcters you want) in componentDidMount

componentDidMount () {
    loadcaptchaenginge(6); 
 };

• Step 6 Validate captcha by using validateCaptcha(user_captcha_value)

doSubmit = () => {
     let user_captcha_value = document.getElementById('captcha').value;

     if (validateCaptcha(user_captcha_value)==true) {
         alert('Captcha Matched');
     }

     else {
         alert('Captcha Does Not Match');
     }
 };

OR If you don't watch captcha to be reloaded if user enter the wrong value then set second parameter to false validateCaptcha(user_captcha_value, false)

doSubmit = () => {
       let user_captcha_value = document.getElementById('captcha').value;

       if (validateCaptcha(user_captcha_value, false)==true) {
           alert('Captcha Matched');
       }

       else {
           alert('Captcha Does Not Match');
       }
   };

Options

Listed are all the options available for react-simple-captcha

Name	Description
LoadCanvasTemplate	It will load the captcha with 'Reload Captcha' functionality. Place between your render code, usage example {ReactHtmlParser(LoadCanvasTemplate)}
LoadCanvasTemplateNoReload	It will load the captcha without 'Reload Captcha' functionality. Place between your render code, usage example {ReactHtmlParser(LoadCanvasTemplateNoReload)}
loadcaptchaenginge(Number_Of_Captcha_Charcters);	Simply paste it in componentDidMount(). Pass number of captcha characters you want to display.
validateCaptcha(User_Submitted_Value)	Will return true if user submitted value matches with captcha otherwise false. Also will reload captcha if user submitted value is false
validateCaptcha(User_Submitted_Value, false)	Will return true if user submitted value matches with captcha otherwise false. Will not reload captcha if user submitted value is false

Example

Let's create a class name CaptchaTest with react simple captcha functionality:

import React, { Component } from 'react';
import ReactHtmlParser from 'react-html-parser'; 
import { loadcaptchaenginge, LoadCanvasTemplate, LoadCanvasTemplateNoReload, validateCaptcha } from 'react-simple-captcha';



class CaptchaTest extends Component {

   componentDidMount () {
      loadcaptchaenginge(6); 
   };

   doSubmit = () => {
       let user_captcha = document.getElementById('captcha').value;

       if (validateCaptcha(user_captcha)==true) {
           alert('Captcha Matched');
           loadcaptchaenginge(6); 
           document.getElementById('captcha').value = "";
       }

       else {
           alert('Captcha Does Not Match');
           document.getElementById('captcha').value = "";
       }
   };

   render() {
        

       return (<div>
           <div className="container">
               <div className="form-group">

                   <div className="col mt-3">
                       {ReactHtmlParser(LoadCanvasTemplate)}
                   </div>

                   <div className="col mt-3">
                       <div><input placeholder="Enter Captcha Value" id="captcha" name="captcha" type="text"></input></div>
                   </div>

                   <div className="col mt-3">
                       <div><button class="btn btn-primary" onClick={() => this.doSubmit()}>Submit</button></div>
                   </div>
                     
               </div>

           </div>
       </div>);
   };
}

export default CaptchaTest;

Import CaptchaTest in index.js

import CaptchaTest from './captcha_test'; 

Now replace ReactDOM.render with

ReactDOM.render(<CaptchaTest />, document.getElementById('root'));

Browser support

Works in every modern browser which has support for canvas element.

License

react-simple-captcha is licensed under the MIT license.

Author Profile

Name: Masroor Ejaz Linkedin: https://www.linkedin.com/in/masroorejaz/
Twitter: https://twitter.com/masroorejaz