Implementing reCaptcha ajax api to an exiting webform that already uses ajax

Question

I have a signup form on my home page which uses server side validation and ajax so my page doesn't refresh while validating.

When all validation is passed my page is taken to a registered.html which is a temporary page for now. Later on it will be an account area.

What I want

I want to have 1 last step after the actual form validation which will be my reCaptcha validation. Instead of submitting the form after validation I want reCaptcha to popup twitter style or just replace the form fields facebook style.

Only after successful captcha validation will the form be submitted. I have provided the code below and would really appreciate if someone could advise me on the best way to implement this. Right now I'm at a stage where I'm confused.

Error checking and at the very bottom you can see the echo statement that sends a user to registered.html after successful validation

<?php

// we check if everything is filled in

if(empty($_POST['first_name']) || empty($_POST['last_name']) || empty($_POST['email']) || empty($_POST['password']))
{
 die(msg(0,"All the fields are required"));
}


// is the sex selected?

if(!(int)$_POST['sex'])
{
 die(msg(0,"You have to select your sex"));
}


// is the birthday selected?

if(!(int)$_POST['day'] || !(int)$_POST['month'] || !(int)$_POST['year'])
{
 die(msg(0,"You have to fill in your birthday"));
}


// is the email valid?

if(!(preg_match("/^[\.A-z0-9_\-\+]+[@][A-z0-9_\-]+([.][A-z0-9_\-]+)+[A-z]{1,4}$/", $_POST['email'])))
 die(msg(0,"You haven't provided a valid email"));



// Here I must put your code for validating and escaping all the input data,
// inserting new records in your DB and echo-ing a message of the type:

// echo msg(1,"/member-area.php");

// where member-area.php is the address on my site where registered users are
// redirected after registration.




echo msg(1,"registered.html");


function msg($status,$txt)
{
 return '{"status":'.$status.',"txt":"'.$txt.'"}';
}
?>

The javascript

$(document).ready(function(){

 $('#fhjoinForm').submit(function(e) {

  register();
  e.preventDefault();

 });

});


function register()
{
 hideshow('loading',1);
 error(0);

 $.ajax({
  type: "POST",
  url: "submit.php",
  data: $('#fhjoinForm').serialize(),
  dataType: "json",
  success: function(msg){

   if(parseInt(msg.status)==1)
   {
    window.location=msg.txt;
   }
   else if(parseInt(msg.status)==0)
   {
    error(1,msg.txt);
   }

   hideshow('loading',0);
  }
 });

}


function hideshow(el,act)
{
 if(act) $('#'+el).css('visibility','visible');
 else $('#'+el).css('visibility','hidden');
}

function error(act,txt)
{
 hideshow('error',act);
 if(txt) $('#error').html(txt);
}

Now I'm thinking there must be a simple way to implement reCaptcha ajax api into my current form. At first I tried to add onclick="showRecaptcha('recaptcha_div');" to the end of my form where my input type=submit is located this didn't work.

The end of my form

    <td><input type="submit" class="joinButton" value="Join Us" /><img id="loading" src="<?php echo base_url()?>images/join/ajax-loader.gif" alt="working.." /></td>
    <div id="recaptcha_div"></div>
    </tr>

I've follows the instructions on the recaptcha website and no luck so far. Code snippets, advice anything will help. I appreciate it.

Thanks

Answer 1

Have you looked into their JS lib API reference? http://wiki.recaptcha.net/index.php/Overview#AJAX_API

Recaptcha.create("apikey",
  "placeholder_div",
  {
    theme: "red",
    callback: function(){
      // what to do on success, like maybe submit your form
    }
  }
);

You can just create the reCAPTCHA element where desired and add some callback to do whatever you want.

Regarding your comment about where to put the recaptcha creation code, you could put it in the callback from your AJAX request

   if(parseInt(msg.status)==1)
   {
     Recaptcha.create("apikey",
       "placeholder_div",
       {
         theme: "red",
         callback: function(){
           // what to do on success
           window.location=msg.txt;
         }
       }
     );
   }

Answer 2

Here is the code I am getting the error with.. on the line "window.location=msg.txt};"

function register()
{
    hideshow('loading',1);
    error(0);

    $.ajax({
        type: "POST",
        url: "submit.php",
        data: $('#fhjoinForm').serialize(),
        dataType: "json",
        success: function(msg){

            if(parseInt(msg.status)==1)
            {

                        Recaptcha.create("apikey", "placeholder_div",
                        {
                        theme: "red",
                        callback: function(){
                        // what to do on success

                window.location=msg.txt};
            }
            else if(parseInt(msg.status)==0)
            {
                error(1,msg.txt);
            }

            hideshow('loading',0);
        }
    });

}