Solspace freeform: sending pre-generated token to user

Question

I am trying to send an unique code when user submit their form.

Each unique code should send only once in order with each submission.

Any help would be appreciated.

Answer 1

The answer is similar to that given here: Solspace Freeform 4+ submission per email address

In summary:

• Create an add-on that uses Freeform hooks to check for Freeform entries matching the token upon form submission
• Give the illusion of a duplicate submission. It doesn't prevent submitting or saving the form again with the same token, but the front-end user would see a message upon duplication.

Additional solutions

If you're comfortable with AJAX and javascript/jQuery, you could have a field which, upon typing the token in it, calls a template in the background which contains {exp:freeform:entries}. This tag would check if any previous Freeform entries contain the same token (using the search:MY_FIELD="" parameter). If an entry is found, prevent the user from submitting the form through javascript (eg. blocking submission).

If you're not comfortable with AJAX or javascript/jQuery, you could do something similar, but with a simple HTML form which asks for the token code before the main Freeform form. Eg.

<form method="post" action="{path='template_group/template'}">
    <label for="token">Your token code:</label>
    <input id="token" name="token" placeholder="Eg. 123ABC" />
    <input type="submit" />
</form>

Then, after submitting the form and moving to template_group/template, using a plugin such as Mo'Variables, retrieve the token (it's a POST variable) and pass it in {exp:freeform:entries} to check for previous Freeform entries containing the same token code. Display the form if there are no previous Freeform entries, or display a message if a previous token is found:

{exp:freeform:entries search:token="{post:token}"}
    {if freeform:no_results}
        {exp:freeform:form /* your other parameters */}
            // Your form...
        {/exp:freeform:form}
    {/if}

    {if freeform:count == 1}
        <p>You already submitted the form.</p>
    {/if}
{/exp:freeform:entries}

Note: The above uses Mo'Variables, but you could do this with PHP instead as well. Turn on PHP in EE (Input mode), and use <?php echo ee()->input->post('token', TRUE); ?> instead of the above {post:token}.