Multistep drupal form with tables - forms

Question

Can anyone tell me how to make a multi-step drupal form which prints a table in one of the steps?-
This is the code I already have, it corresponds to the second step of the form. It throws me this error:
Fatal error: Cannot unset string offsets in C:\wamp\www\academicus\includes\form.inc on line 497
function listarAlumnos($nombre, $apellido) {
if($nombre=='') {
$consulta="SELECT * FROM Pinteres WHERE PinApe1='".$apellido."' or PinApe2='".$apellido;
} else if ($apellido=='') {
$consulta="SELECT * FROM Pinteres WHERE PinNom1='".$nombre."' or PinNom2='".$nombre."'";
} else {
$consulta="SELECT * FROM Pinteres WHERE (PinNom1='".$nombre."' or PinNom2='".$nombre."') AND (PinApe1='".$apellido."' or PinApe2='".$apellido."')";
}
$resultado=consultarContacta($consulta);
$form=array();
$header = array(t('Id'), t('Primer nombre'), t('Segundo nombre'), t('Primer apellido'), t('Segundo apellido'), t('Direccion'), t('Telefono'), t('Celular'), t('Email'));
$rows = array();
while ($rs=odbc_fetch_array($resultado)) {
$row=array();
$id=$rs['PinId'];
$primerNombre=$rs['PinNom1'];
$segundoNombre=$rs['PinNom2'];
$primerApellido=$rs['PinApe1'];
$segundoApellido=$rs['PinApe2'];
$direccion=$rs['PinDir'];
$telefono=$rs['PinTelPri'];
$celular=$rs['PinTelCel'];
$email=$rs['PinEMail'];
$row[] = $id;
$row[] = $primerNombre;
$row[] = $segundoNombre;
$row[] = $primerApellido;
$row[] = $segundoApellido;
$row[] = $direccion;
$row[] = $telefono;
$row[] = $celular;
$row[] = $email;
$rows[] = $row;
};
$form['IdIngresado'] = array (
'#title' => t('Id interesado a importar'),
'#type' => 'textfield',
'#required' => TRUE,
'#description' => t('Ingrese el id del interesado a importar de los listados arriba.')
);
$form['CedulaIngresada'] = array (
'#title' => t('Cedula interesado a importar'),
'#type' => 'textfield',
'#required' => TRUE,
'#description' => t('Ingrese la cedula del interesado a importar.')
);
$form['finalizar'] = array (
'#type' => 'submit',
'#value' => t('Finalizar')
);
$output .= theme('table', $header, $rows);
$output .= drupal_render($form);
return $output;
}
I could make it work using some code like this:
$form['serial'] = array(
'#type' => 'textfield',
'#title' => t('serial number'),
'#prefix' => '<table><tr><td>',
'#suffix' => '</td>',
);
but I know it's not the proper way of doing it.

Answer 1

I assume you know how to do the multi-step form. For the table, you can use Drupal's table theme function. If the table contains only markup, you can do something like this:
$form['table'] = array ('#value' => theme('table', $headers, $rows));
$headers are the table headers and $rows are your data.
If the table contains actual form elements (such as selects, textfields, etc.), you can wrap them in a form element that calls a theme function, like so:
$form['table'] = array ('#theme' => 'output_table');
$form['table']['element_1'] = array (...);
$form['table']['element_2'] = array (...);
Within 'theme_output_table', generate your $headers and $rows to feed to 'theme_table' by calling 'drupal_render' on the relevant form elements that are children of $form['table'].