pre-populate help

I have created a few custom meta boxes for product information using the code below:

<h1 class="product"><?php the_title(); ?></h1>
<strong>Auteur:</strong>&nbsp;<?php echo get_post_meta($post->ID, author, true); ?><br/>
<strong>Prijs:</strong>&nbsp;€<?php echo get_post_meta($post->ID, price, true); ?><br/>
<strong>ISBN:</strong>&nbsp;<?php echo get_post_meta($post->ID, isbn, true); ?><br/>
<strong>Uitgever:</strong>&nbsp;<?php echo get_post_meta($post->ID, publisher, true); ?><br/>
<strong>Uitvoering:</strong>&nbsp;<?php echo get_post_meta($post->ID, format, true); ?><br/>
<strong>Verschenen:</strong>&nbsp;<?php echo get_post_meta($post->ID, releasedate, true); ?><br/><br/>

I have a button on the WordPress page that lets you send an email to the shop to check if this product is available. What do I need to do to pre-populate the fields I have on the GF with:

<?php the_title(); ?>
<?php echo get_post_meta($post->ID, author, true); ?>
<?php echo get_post_meta($post->ID, isbn, true); ?>
<?php echo get_post_meta($post->ID, publisher, true); ?>

Thanks for any help!

Carl, Thanks for the help on pointing this out. I been reading many articles like this but unfortunately it's all a little foreign to me even as clear as it seems.

I am a visual learner so ready that code and trying to figure out how to fits to my code is hard for me to put together. Any chance I get 1 example how that might look for the code I gave then I might be able to comprehend it a bit more.

Thanks!!!

illutic, thanks for the reply. the code is definitely making sense to me now. I wish it worked when I put it all together, but that's another story :)

I wanted to start with the code. I put it in my functions.php : http://tinypic.com/r/2lo3tza/7

Then I added the parameter in the form: http://tinypic.com/r/2lb1fmw/7

But nothing. Here is the URL: http://bit.ly/otVQjQ

Do you think it has something to do with it being in the shadowbox?

Here is what the code on the page looks like:

<div class="entry-article">
<div style="float:left;">
<?php the_post_thumbnail( 'boeken-post-thumbnail' ); ?></div>
<div style="float:left; width:350px; margin-left:15px; font-size:12px; line-height:18px;">

<h1 class="product"><?php the_title(); ?></h1>
<strong>Auteur:</strong>&nbsp;<?php echo get_post_meta($post->ID, author, true); ?><br/>
<strong>Prijs:</strong>&nbsp;€<?php echo get_post_meta($post->ID, price, true); ?><br/>
<strong>ISBN:</strong>&nbsp;<?php echo get_post_meta($post->ID, isbn, true); ?><br/>
<strong>Uitgever:</strong>&nbsp;<?php echo get_post_meta($post->ID, publisher, true); ?><br/>
<strong>Uitvoering:</strong>&nbsp;<?php echo get_post_meta($post->ID, format, true); ?><br/>
<strong>Verschenen:</strong>&nbsp;<?php echo get_post_meta($post->ID, releasedate, true); ?><br/><br/>

<?php echo do_shortcode('[button style="info" size="small" color="silver" link="http://stackmacdesigns.com/clients/boek/?page_id=177" rel="shadowbox"]informatie vragen[/button]'); ?></a>
</div>

Thanks for the feedback

Ok, update. Thanks to illutic I found what I was missing. In your code I just needed to add "value_" to the first value.

add_filter('gform_field_auteur',

add_filter('gform_field_value_auteur',

Now I have the data passing correctly.