Can't send sku on contact form

Question

My intention is to send the sku as a hidden variable when applying for the contact form but only after having visited a product.

It works fine with localhost, where the cache is disabled, but not with the online website because it only gets the information the first time I access to the contact page and when I access from another product it maintains the previous sku. It only works when I refresh the cache but it's really strange in my opinion.

Here is the code I have for form.phtml

<?php
    if(isset($_GET['sku'])) 
    {
        $print_text = $_GET['sku'];
    }
    else
    {
        $print_text = "";
    }
?>
<input type="hidden" value="<?php echo $print_text ?>" name="sku" id="sku" title="<?php echo Mage::helper('contacts')->__('Sku') ?>"/>

And this for view.phtml

<p>Para cantidades inferiores o informaci&oacute;n <a href="http://example.com/contacto/?sku=<?php echo $_product->getSku() ?>">consultar</a></p>

And I get the information from the admin panel, transactional emails. Adding this at the end of the contact form:

<p>Sku: {{var data.sku}}</p>

How can I get the information without having to refresh cache the whole time?

Answer 1

Better idea to use this code for getting sku

$print_text=Mage::app()->getRequest()->getParam('sku');

I guess your contacts us url may be http://example.com/contacts instead of http://example.com/contacto