Authentication with CAPTCHA

Question

Authentication with CAPTCHA

I have created a basic form in jsp. I am looking to make both the reCAPTCHA and the textbox mandatory fields. Currently, even if I only fill in the text box and click 'Sign In', the data is submitted. How can I enforce the reCAPTCHA to be a compulsory field?

<!DOCTYPE html>
<html lang="en">
<head>

<script src='https://www.google.com/recaptcha/api.js'></script>

</head>

<body>

<label> Form </label>

<form action = "somefile" method = "post">

  <input = "text" name = "textbox1" required>

  <div class="g-recaptcha" data-sitekey="6LdliBkTAAAAALmMlPRRm0NtKW3fz2kT2nxiWrVG"></div>

  <button type="submit" name="login">Sign In</button>

</form>

</body>
</html>

javascript validation recaptcha

Answer 1

Answer №1

If you want to make the reCaptcha required using JavaScript, you can do so. Remember that you still need to verify the reCaptcha on the server side, but adding client side validation can be helpful.

Start by creating a JavaScript variable to keep track of the reCaptcha status:
```
var captcha_passed = false;
```

Configure Google's reCaptcha to call a function upon successful completion:

<div class="g-recaptcha" data-callback="on_captcha_filled" data-sitekey="6LdliBkTAAAAALmMlPRRm0NtKW3fz2kT2nxiWrVG"></div>

Include a hidden label to inform users about the missing reCaptcha. The label will be displayed if the form is submitted without completing the reCaptcha:
```
<label id="lblCaptchaRequired" style="color: red" hidden>Please complete the reCaptcha</label>
```

Define a JavaScript function that will be triggered by the reCaptcha completion:

function on_captcha_filled() {
    captcha_passed = true;
    document.getElementById("lblCaptchaRequired").hidden = true;
}

Add an onsubmit handler to the form to ensure that the reCaptcha is completed before proceeding:
```
<form action = "somefile" method = "post" onsubmit = "check_captcha(event)">
```

Implement the onsubmit handler in JavaScript:

function check_captcha(e) {
    if (captcha_passed)
        return true;
    document.getElementById("lblCaptchaRequired").hidden = false;
    e.preventDefault();
}

Updated form layout:

<form action = "somefile" method = "post" onsubmit = "check_captcha(event)">
    <input = "text" name = "textbox1" required>
    <div class="g-recaptcha" data-callback="on_captcha_filled" data-sitekey="6LdliBkTAAAAALmMlPRRm0NtKW3fz2kT2nxiWrVG"></div>
    <label id="lblCaptchaRequired" style="color: red" hidden>Please complete the reCaptcha</label>
    <button type="submit" name="login">Sign In</button>
</form>

JavaScript file:

var captcha_passed = false;

// Form onsubmit handler.
function check_captcha(e) {
    if (captcha_passed)
        return true;
    document.getElementById("lblCaptchaRequired").hidden = false;
    e.preventDefault();
}

// Google reCaptcha data-callback handler.
function on_captcha_filled() {
    captcha_passed = true;
    document.getElementById("lblCaptchaRequired").hidden = true;
}

Upon reaching the page, the required label is hidden initially, and the captcha_passed variable is set to false. When the user submits the form, the check_captcha onsubmit handler is invoked, checking the captcha_passed status to either proceed with submission or display the label.
Once the reCaptcha is successfully completed, the on_captcha_filled function is called to update the captcha_passed status and hide the label.

Answer 2

If you want to make the reCaptcha required using JavaScript, you can do so. Remember that you still need to verify the reCaptcha on the server side, but adding client side validation can be helpful.

Start by creating a JavaScript variable to keep track of the reCaptcha status:
```
var captcha_passed = false;
```

Configure Google's reCaptcha to call a function upon successful completion:

<div class="g-recaptcha" data-callback="on_captcha_filled" data-sitekey="6LdliBkTAAAAALmMlPRRm0NtKW3fz2kT2nxiWrVG"></div>

Include a hidden label to inform users about the missing reCaptcha. The label will be displayed if the form is submitted without completing the reCaptcha:
```
<label id="lblCaptchaRequired" style="color: red" hidden>Please complete the reCaptcha</label>
```

Define a JavaScript function that will be triggered by the reCaptcha completion:

function on_captcha_filled() {
    captcha_passed = true;
    document.getElementById("lblCaptchaRequired").hidden = true;
}

Add an onsubmit handler to the form to ensure that the reCaptcha is completed before proceeding:
```
<form action = "somefile" method = "post" onsubmit = "check_captcha(event)">
```

Implement the onsubmit handler in JavaScript:

function check_captcha(e) {
    if (captcha_passed)
        return true;
    document.getElementById("lblCaptchaRequired").hidden = false;
    e.preventDefault();
}

Updated form layout:

<form action = "somefile" method = "post" onsubmit = "check_captcha(event)">
    <input = "text" name = "textbox1" required>
    <div class="g-recaptcha" data-callback="on_captcha_filled" data-sitekey="6LdliBkTAAAAALmMlPRRm0NtKW3fz2kT2nxiWrVG"></div>
    <label id="lblCaptchaRequired" style="color: red" hidden>Please complete the reCaptcha</label>
    <button type="submit" name="login">Sign In</button>
</form>

JavaScript file:

var captcha_passed = false;

// Form onsubmit handler.
function check_captcha(e) {
    if (captcha_passed)
        return true;
    document.getElementById("lblCaptchaRequired").hidden = false;
    e.preventDefault();
}

// Google reCaptcha data-callback handler.
function on_captcha_filled() {
    captcha_passed = true;
    document.getElementById("lblCaptchaRequired").hidden = true;
}

Upon reaching the page, the required label is hidden initially, and the captcha_passed variable is set to false. When the user submits the form, the check_captcha onsubmit handler is invoked, checking the captcha_passed status to either proceed with submission or display the label.
Once the reCaptcha is successfully completed, the on_captcha_filled function is called to update the captcha_passed status and hide the label.

Answer 3

Answer №2

Greetings! Below is the comprehensive solution for client-side validation:

HTML form: I have included a text box called google-response and set up three callback events: 1) data-error-callback="wrongCaptcha", 2) data-callback="correctCaptcha", 3) data-expired-callback="wrongCaptcha".

<form class="form-inline" class="text-center">
  <div class="form-group">
    <label for="email">Email:</label>
      <input type="email" id="newsletter-email" class="form-control" id="email">
  </div>
   <button type="button" class="btn btn-default" onclick="validationNewsletter()">Submit</button>
   <input type="hidden" id="google-response"/>
   <br/><br/>
  <div class="form-group">
  <div class="g-recaptcha" id="gcaptcha" data-sitekey="XXXX-XXXX" data-error-callback="wrongCaptcha" data-callback="correctCaptcha" data-expired-callback="wrongCaptcha"></div>
                </div>
</form>

JS Validation

  <script>
   function validationNewsletter() {
    if($('#google-response').val()==""||$("[name=g-recaptcha-response]").val()==""){
       alert("Please check google recaptcha");
      return false;
    }
    if($('#google-response').val()!=$("[name=g-recaptcha-response]").val()){
        alert("Sorry spammer");   
        return false;
    }
   if(letsPutFormValidation){
   alert("Some form validation");   
        return false;
  }
  $('#form-id').submit();
 }

 var correctCaptcha = function (response) {
    $('#google-response').val(response);
 };

  var wrongCaptcha=function(response){
    $('#google-response').val('');
  }
</script>

Answer 4

Greetings! Below is the comprehensive solution for client-side validation:

HTML form: I have included a text box called google-response and set up three callback events: 1) data-error-callback="wrongCaptcha", 2) data-callback="correctCaptcha", 3) data-expired-callback="wrongCaptcha".

<form class="form-inline" class="text-center">
  <div class="form-group">
    <label for="email">Email:</label>
      <input type="email" id="newsletter-email" class="form-control" id="email">
  </div>
   <button type="button" class="btn btn-default" onclick="validationNewsletter()">Submit</button>
   <input type="hidden" id="google-response"/>
   <br/><br/>
  <div class="form-group">
  <div class="g-recaptcha" id="gcaptcha" data-sitekey="XXXX-XXXX" data-error-callback="wrongCaptcha" data-callback="correctCaptcha" data-expired-callback="wrongCaptcha"></div>
                </div>
</form>

JS Validation

  <script>
   function validationNewsletter() {
    if($('#google-response').val()==""||$("[name=g-recaptcha-response]").val()==""){
       alert("Please check google recaptcha");
      return false;
    }
    if($('#google-response').val()!=$("[name=g-recaptcha-response]").val()){
        alert("Sorry spammer");   
        return false;
    }
   if(letsPutFormValidation){
   alert("Some form validation");   
        return false;
  }
  $('#form-id').submit();
 }

 var correctCaptcha = function (response) {
    $('#google-response').val(response);
 };

  var wrongCaptcha=function(response){
    $('#google-response').val('');
  }
</script>

Authentication with CAPTCHA

Answer №1

Answer №2

Similar questions

Decomposing LocalStorage data in React using JavaScript

Tips on creating a responsive absolute div

Flipping over every single card, but only desire to flip them one at a time

The req.isAuthenticated function in Node.js passport consistently returns false

Blender Mesh Not Visible in Three.js

unable to utilize references in React

Issues with Bootstrap 4 (possibly JQuery) - mobile menu navigation items are unresponsive

Instructions for securing a React Front End with Node.js Express-Sessions authentication:

Is invalid HTML causing issues with Backbone.js templating in Phonegap?

How can you display varying information based on a dropdown selection using Material-UI's Select component?

Exploring ways to create fresh arrays derived from the original array

"Getting an 'Undefined index' error while accessing a JavaScript variable in PHP

Retrieve JavaScript Variable Value when Button is Clicked via asp:HiddenField

Building a Laravel PHP application that dynamically generates a custom JSON object fetched from the database and passes it from PHP to

What is the best way to apply an SVG as the background-image for this text?

Is it possible to send information via the URL while using jQuery Mobile?

Why won't the state change when using Angular's ui-router $state.go method?

The function signature '(newValue: DateRange<dateFns>) => void' does not match the expected type '(date: DateRange<unknown>, keyboardInputValue?: string | undefined) => void' as per TypeScript rules

Ways to steer clear of using eval for converting strings to decimal values

Tips for seamlessly creating the animation of sketching a line