jquery-captcha

BotDetect CAPTCHA jQuery Plugin: Simple API integration for jQuery 1/2/3+

For a comprehensive step-by-step integration guide please see our jQuery Captcha Plugin 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 jQuery Captcha Plugin works we pasted bellow a few, not necessary up-to-date (and mostly frontend related), excerpts from the Integration Guide.

Quick guide:

1) jQuery Captcha Plugin Installation

npm install jquery-captcha --save

2) Include jQuery Captcha Plugin in Your App

<script src="node_modules/jquery-captcha/dist/jquery-captcha.min.js"></script>

3) Load jQuery Captcha Plugin in Your App, and Configure Backend Captcha Endpoint

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

• ASP.NET-based captcha endpoint:

$(document).ready(function() {
  // DOM ready
  var captcha = $('#botdetect-captcha').captcha({
    captchaEndpoint: 
      'https://your-app-backend-hostname.your-domain.com/simple-captcha-endpoint.ashx'
  });
});

• Java-based captcha endpoint:

$(document).ready(function() {
  // DOM ready
  var captcha = $('#botdetect-captcha').captcha({
    captchaEndpoint: 
      'https://your-app-backend-hostname.your-domain.com/simple-captcha-endpoint'
  });
});

• PHP-based captcha endpoint:

$(document).ready(function() {
  // DOM ready
  var captcha = $('#botdetect-captcha').captcha({
    captchaEndpoint: 
      'https://your-app-backend-hostname.your-domain.com/botdetect-captcha-lib/simple-botdetect.php'
  });
});

4) Display Captcha In Your View

<div id="botdetect-captcha" data-captchastylename="yourFirstCaptchaStyle"></div>
<input id="yourFirstCaptchaUserInput" type="text"/>

5) Captcha Validation: Client-side Code

$('#yourFormWithCaptcha').submit(function(event) {

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

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

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

  // post the captcha data to the /your-app-backend-path on your backend
  $.ajax({
    method: 'POST',
    url: 'https://your-app-backend-hostname.your-domain.com/your-app-backend-path',
    dataType: 'json',
    contentType: 'application/json; charset=utf-8',
    data: JSON.stringify(postData),
    success: function(response) {
      if (response.success == false) {
        // captcha validation failed; reload image
        captcha.reloadImage();
        // TODO: maybe display an error message, too
      } else {
        // TODO: captcha validation succeeded; proceed with your workflow
      }
    }
  });

  event.preventDefault();
});

6) 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 on backend is executed in the following way:

// C#
SimpleCaptcha yourFirstCaptcha = new SimpleCaptcha();
bool isHuman = yourFirstCaptcha.Validate(userEnteredCaptchaCode, captchaId);

' VB.NET
Dim yourFirstCaptcha As SimpleCaptcha = New SimpleCaptcha()
Dim isHuman As Boolean = yourFirstCaptcha.Validate(userEnteredCaptchaCode, captchaId)

• Server-side captcha validation with Java Captcha on backend is executed in the following way:

SimpleCaptcha yourFirstCaptcha = SimpleCaptcha.load(request);
boolean isHuman = yourFirstCaptcha.validate(userEnteredCaptchaCode, captchaId);

• Server-side captcha validation with PHP Captcha on backend is executed in the following way:

$yourFirstCaptcha = new SimpleCaptcha();
$isHuman = $yourFirstCaptcha->Validate($userEnteredCaptchaCode, $captchaId);

Documentation:

1. jQuery Captcha Plugin Step-by-step Integration Guide -- read this one first

2. jQuery Captcha Plugin Basic Example -- partial code walk-through

3. jQuery Captcha Plugin Form Example -- partial code walk-through

Dependencies:

The current version of the jQuery Captcha Plugin requires one of the following BotDetect CAPTCHA backends:

• ASP.NET v4.4.2+
• Java v4.0.Beta3.7+
• PHP v4.2.5+

Technical Support:

Through contact form on captcha.com.