page_2.php

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<?php

require_once 'page_2_ajax.php';
require_once 'page_2_helper.php';

function tpps_page_2_create_form(array &$form, array $form_state) {
  tpps_study_date('Starting', $form, $form_state);

  tpps_study_date('Ending', $form, $form_state);

  $options = array(
    0 => '- Select -',
    'Genotype' => 'Genotype',
    'Phenotype' => 'Phenotype (and/or manual environmental data)',
    'Genotype x Phenotype' => 'Genotype x Phenotype (and/or manual environmental data)',
  );

  if (module_exists('cartogratree') and db_table_exists('cartogratree_groups') and db_table_exists('cartogratree_layers')) {
    $options = array(
      0 => '- Select -',
      'Genotype' => 'Genotype',
      'Phenotype' => 'Phenotype (and/or manual environmental data)',
      'Environment' => 'Environmental layers',
      'Genotype x Phenotype' => 'Genotype x Phenotype (and/or manual environmental data)',
      'Genotype x Environment' => 'Genotype x Environmental layers',
      'Phenotype x Environment' => 'Phenotype (and/or manual environmental data) x Environmental layers',
      'Genotype x Phenotype x Environment' => 'Genotype x Phenotype (and/or manual environmental data) x Environmental layers',
    );
  }

  $form['data_type'] = array(
    '#type' => 'select',
    '#title' => t('Data Type: *'),
    '#options' => $options,
    '#prefix' => '<legend><span class="fieldset-legend"><div class="fieldset-title">Study Design</div></span></legend>',
  );

  $form['study_type'] = array(
    '#type' => 'select',
    '#title' => t('Study Type: *'),
    '#options' => array(
      0 => t('- Select -'),
      1 => t('Natural Population (Landscape)'),
      2 => t('Growth Chamber'),
      3 => t('Greenhouse'),
      4 => t('Experimental/Common Garden'),
      5 => t('Plantation'),
    ),
    '#ajax' => array(
      'wrapper' => 'study_info',
      'callback' => 'tpps_study_type_callback',
    ),
  );

  $form['study_info'] = array(
    '#type' => 'fieldset',
    '#tree' => TRUE,
    '#collapsible' => TRUE,
    '#prefix' => '<div id="study_info">',
    '#suffix' => '</div>',
  );

  $type = tpps_get_ajax_value($form_state, array('study_type'), 0);

  switch ($type) {
    case '1':
      tpps_natural_population($form['study_info']);
      break;

    case '2':
      tpps_growth_chamber($form['study_info']);
      break;

    case '3':
      tpps_greenhouse($form['study_info']);
      unset($form['study_info']['humidity']['uncontrolled']);
      unset($form['study_info']['light']['uncontrolled']);
      unset($form['study_info']['rooting']['ph']['uncontrolled']);
      break;

    case '4':
      tpps_common_garden($form['study_info']);
      break;

    case '5':
      tpps_plantation($form['study_info']);
      break;

    default:
      $form['study_info']['#prefix'] = '<div id="study_info" style="display:none;">';
      break;
  }

  $form['Back'] = array(
    '#type' => 'submit',
    '#value' => t('Back'),
    '#prefix' => '<div class="input-description">* : Required Field</div>',
  );

  $form['Save'] = array(
    '#type' => 'submit',
    '#value' => t('Save'),
  );

  $form['Next'] = array(
    '#type' => 'submit',
    '#value' => t('Next'),
  );

  return $form;
}