Multi page forms with dynamic population

I have read through the forum posts and docs prior to this support request. Here is a quick summary of that I am trying to do.

I have a multipage form. On the first page are 3 text input boxes for the user to enter names. On the second page I want to populate a drop down field with the three values. Here is the code I am using in my hook:

add_filter( 'gform_pre_render_13', 'populate_dropdown' );

function populate_dropdown($form){
    // creating drop down item array.
    $items = array();

    // adding initial empty value
    $items[] = array("text" => "Please Select…", "value" => "");

    // build array of values from text fields on first page of multipage form
    $items[] = array("text" => $entry['4'], "value" => $entry['4']);
    $items[] = array("text" => $entry['5'], "value" => $entry['5']);
    $items[] = array("text" => $entry['6'], "value" => $entry['6']);

    // loop over fields and populate dynamic values into dropdown field 6
    foreach($form["fields"] as &$field)
        if($field["id"] == 6){
            $field["type"] = "select";
            $field["choices"] = $items;
        }
    return $form;
}

The issue I have is that I don't get the $entry['x'] they are all blank. From reading the docs I assume I would need to use the gform_post_submission filter to get the $entry values.

Could you confirm if the post_submission filter is fired when the user goes from page 1 to page 2 and if so how I would use the post_submission and pre_render filters together.

Hopefully this is not a completely stupid question.

Thanks
Steve

Hi David

Many thanks for the quick reply. I have tried your suggestion above but get a PHP error:

Fatal error: Call to undefined function rg_post() in....

So it look like that function is not available! For your info here is the revised code that I am using:

add_filter( 'gform_pre_render_13', 'populate_dropdown' );

function populate_dropdown($form){

    // localise form values
    $d1 = rg_post('input_4');
    $d2 = rg_post('input_5');
    $d3 = rg_post('input_6');

    // creating drop down item array.
    $items = array();

    // adding initial empty value
    $items[] = array("text" => "Please Select…", "value" => "");

    // build array of values from text fields on first page of multipage form
    $items[] = array("text" => $d1, "value" => $d1);
    $items[] = array("text" => $d2, "value" => $d2);
    $items[] = array("text" => $d3, "value" => $d3);

    // loop over fields and populate dynamic values into dropdown field 6
    foreach($form["fields"] as &$field)
        if($field["id"] == 6){
            $field["type"] = "select";
            $field["choices"] = $items;
        }
    return $form;
}

Let me know what you think maybe there is something I need to add.

Thanks for your help.

Steve

Yep that sorted it David :-)

Many thanks for you help.