reactjs-captcha

BotDetect CAPTCHA React Component: Simple API integration for React 13/14/15/16+

For a comprehensive step-by-step integration guide please see our React Captcha Component Integration Guide.
The guide covers the integration with the following backends:
- ASP.NET (Core): web API with MVC Core
- ASP.NET (Legacy): Web-API2, MVC1-5, Generic Handler
- Java: Servlet, Spring, Struts
- PHP: the plain PHP

To give you a hint how React Captcha Component works we pasted bellow a few, not necessary up-to-date (and mostly frontend related), excerpts from the Integration Guide.

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##### 1) React Captcha Component Installation:

``sh
npm install reactjs-captcha --save
`

##### 2) Setting Backend Captcha Endpoint

Endpoint configuration depends on which technology you use in the backend.

- ASP.NET-based captcha endpoint:
`js
import { captchaSettings } from 'reactjs-captcha';

class App extends React.Component {

constructor(props) {
super(props);

captchaSettings.set({
captchaEndpoint:
'https://your-app-backend-hostname.your-domain.com/simple-captcha-endpoint.ashx'
});
}
...
}

export default App;
`

- Java-based captcha endpoint:
`js
import { captchaSettings } from 'reactjs-captcha';

class App extends React.Component {

constructor(props) {
super(props);

captchaSettings.set({
captchaEndpoint:
'https://your-app-backend-hostname.your-domain.com/simple-captcha-endpoint'
});
}
...
}

export default App;
`

- PHP-based captcha endpoint:
`js
import { captchaSettings } from 'reactjs-captcha';

class App extends React.Component {

constructor(props) {
super(props);

captchaSettings.set({
captchaEndpoint:
'https://your-app-backend-hostname.your-domain.com/botdetect-captcha-lib/simple-botdetect.php'
});
}
...
}

export default App;
`

##### 3) Import React Captcha Component and Display Captcha In Your View

`js
import { Captcha } from 'reactjs-captcha';

class App extends React.Component {

...

render() {
return (
ref={(captcha) => {this.captcha = captcha}} />

)
}

}
`

##### 4) Captcha Validation: Client-side Code

`js
// process the yourFormWithCaptcha on submit event
yourFormWithCaptchaOnSubmitHandler(event) {

// the user-entered captcha code value to be validated at the backend side
let userEnteredCaptchaCode = this.captcha.getUserEnteredCaptchaCode();

// the id of a captcha instance that the user tried to solve
let captchaId = this.captcha.getCaptchaId();

let postData = {
userEnteredCaptchaCode: userEnteredCaptchaCode,
captchaId: captchaId
};

let self = this;

// post the captcha data to the /your-app-backend-path on your backend.
// make sure you import the axios in this view with: import axios from 'axios';
axios.post(
'https://your-app-backend-hostname.your-domain.com/your-app-backend-path',
postData, {headers: {'Content-Type': 'application/json; charset=utf-8'}})
.then(response => {
if (response.data.success == false) {
// captcha validation failed; reload image
self.captcha.reloadImage();
// TODO: maybe display an error message, too
} else {
// TODO: captcha validation succeeded; proceed with your workflow
}
});

event.preventDefault();
}
`

##### 5) Captcha Validation: Server-side Code

The userEnteredCaptchaCode and captchaId values posted from the frontend are used to validate a captcha challenge on the backend.

The validation is performed by calling the: Validate(userEnteredCaptchaCode, captchaId).

- Server-side captcha validation with ASP.NET Captcha is performed in the following way:
`csharp
// C#
SimpleCaptcha yourFirstCaptcha = new SimpleCaptcha();
bool isHuman = yourFirstCaptcha.Validate(userEnteredCaptchaCode, captchaId);
`
`vbnet
' VB.NET
Dim yourFirstCaptcha As SimpleCaptcha = New SimpleCaptcha()
Dim isHuman As Boolean = yourFirstCaptcha.Validate(userEnteredCaptchaCode, captchaId)
`

- Server-side captcha validation with Java Captcha is performed in the following way:
`java
SimpleCaptcha yourFirstCaptcha = SimpleCaptcha.load(request);
boolean isHuman = yourFirstCaptcha.validate(userEnteredCaptchaCode, captchaId);
`

- Server-side captcha validation with PHP Captcha is performed in the following way:
`php
$yourFirstCaptcha = new SimpleCaptcha();
$isHuman = $yourFirstCaptcha->Validate($userEnteredCaptchaCode, $captchaId);
``

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1. React Captcha Component Step-by-step Integration Guide -- read this one first

2. React Captcha Component Basic Example -- partial code walk-through

3. React Captcha Component Form Example -- partial code walk-through

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The current version of the React Captcha Component requires one of the following BotDetect CAPTCHA backends:
- ASP.NET v4.4.2+
- Java v4.0.Beta3.7+
- PHP v4.2.5+

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Through contact form on captcha.com.