Google reCaptcha doesn't get loaded when Bootstrap call the remote modal

Question

I have defined in my first page something like this :

<span class="btn btn-default"> <a data-toggle="modal"
        id="fillTheFormHiddenInput" data-target="#login-modal" href="login-i">sign in</a>
</span>

and at the end of the first page :

<div class="modal fade" id="login-modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
</div>

and this is my second page: (.../login-i)

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page import="net.tanesha.recaptcha.ReCaptcha" %>
<%@ page import="net.tanesha.recaptcha.ReCaptchaFactory" %>
<div class="modal-dialog" style="width: 350px !important;">
    <div class="modal-content">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal"
                aria-hidden="true">&times;</button>
            <h4 class="modal-title">Login to Dashboard</h4>
        </div>

        <form:form role="form" method="post" commandName="userCredential">
            <div class="modal-body border-top-less">

                <form:errors cssClass="" path="*" element="div" />

                <form:input path="username" class="form-control"
                    placeholder="Your username" id="inputUsername1" />
                <br />

                <form:password path="password" class="form-control"
                    placeholder="Your Password" id="inputPassword1" />
                <div>
                <%
                    ReCaptcha c = ReCaptchaFactory.newReCaptcha("6LdoF_ISAAAAAH3dYUqRZvpCwPCyH4lfBxdLy_a3", "6LdoF_ISAAAAAGxauxkNaSjv3DTBRmEvawWaklo_", false);
                        out.print(c.createRecaptchaHtml(null, null));
                %>
                </div>

                <br />
                <div class="form-group">
                    <button type="submit" class="btn btn-default btn-block">sign
                        in</button>
                </div>

                <div class="form-group text-center">
                    <a href="${routePath}signup">Sign Up Now !!</a>
                </div>



            </div>
        </form:form>

    </div>
</div>

actually I'm calling a remote modal with this way. but when I click the login button, the reCaptcha doesn't get loaded and this will show out:

Reload the page to get source for: http://api.recaptcha.net/challenge...

I also noticed that the status code is 302 when the script is getting loaded :

what is the problem ??? (for you to know if I load the page login-i without modal the reCaptcha DOES show out)

---

here is the simplified version of the project, you can take a look at it ...

https://app.box.com/s/zduxdiafwzmsw2u6eqm7

Answer 1

The problem is that recaptcha code run with document.write() method. When you call ajax, you can't use that method because of ajax. For example, data-remote in modal use ajax internally.

If you run the code in chrome, you can see the warning below.

Failed to execute 'write' on 'Document': It isn't possible to write into a document from an asynchronously-loaded external script unless it is explicitly opened.

Google provide other way of recaptcha for solving the problem. You can add the script in your index.jsp first.

<script type="text/javascript" src="http://www.google.com/recaptcha/api/js/recaptcha_ajax.js"></script>

And then, replace the code in login.jsp.

<%
  ReCaptcha c = ReCaptchaFactory.newReCaptcha("YOUR_API_KEY", "YOUR_TOKEN", false);
  out.print(c.createRecaptchaHtml(null, null));
%>

to...

<div id="recaptcha"></div>
<script>
  Recaptcha.create("YOUR_API_KEY",   // update with your api key
    "recaptcha",
    {
      theme: "red",
      callback: Recaptcha.focus_response_field
    }
  );
</script>

That's all. ReCaptcha will show on the modal.

FYI, you need to verify the form. Verifying the User's Answer Without Plugins will be helpful.