Magento : Get Product Ids, Sku, Category Id in Custom Module Field set

A) Open your Form.php File  "app\code\local\[Namespace]\[Module Name]\Block\Adminhtml\[Modele Name]\Edit\Tab\Form.php"




/* Three functions for call Category list, Product_ids and Product Skus */

 <?php

              class Addon_Beautygirl_Block_Adminhtml_Beautygirl_Edit_Tab_Form extends            Mage_Adminhtml_Block_Widget_Form

  {

        public function buildCategoriesMultiselectValues(Varien_Data_Tree_Node $node, $values, $level = 0)
       {
               $level++;
               //-----new start for only 3 level category
               if($level>3)
               {
                         return $values;
                         // print_r($values);
                }
                //-----new close
                $values[$node->getId()]['value'] =  $node->getId();
                $values[$node->getId()]['label'] = str_repeat("---", $level) . $node->getName();

                foreach ($node->getChildren() as $child)
                {
                       $values = $this->buildCategoriesMultiselectValues($child, $values, $level);
                 }
                 return $values;
       }

       public function load_tree()
      {
                $tree = Mage::getResourceSingleton('catalog/category_tree')->load();
                $store = 1;
                $parentId = 1;
                $tree = Mage::getResourceSingleton('catalog/category_tree')->load();
                $root = $tree->getNodeById($parentId);
                 if($root && $root->getId() == 1)
                 {
                         $root->setName(Mage::helper('catalog')->__('Root'));
                  }
                  $collection = Mage::getModel('catalog/category')->getCollection()
                                       ->setStoreId($store)
                                       ->addAttributeToSelect('name')
                                       ->addAttributeToSelect('is_active');
                  $tree->addCollectionData($collection, true);
                  return $this->buildCategoriesMultiselectValues($root, array());
         }

         function getProductCollection()
         {
                 $model = Mage::getModel('catalog/product'); //getting product model
                 $collection = $model->getCollection(); //products collection
                 $count = 0;
                 foreach ($collection as $product) //loop for getting products
                {
                        $a = $count++;
                        $values[$a]['label'] = $product->getId();
                        $values[$a]['value'] = $product->getId();
                        //$pids[] = $product->getId();
                        //return $product->getSku();
                  }
                  //print_r($pids);
                  return $values;
           }

        function getProductCollectionskus()
       {
                 $model = Mage::getModel('catalog/product'); //getting product model
                 $collection = $model->getCollection(); //products collection
                 $count = 0;
                 foreach ($collection as $product) //loop for getting products
                 {
                         $a = $count++;
                         $values[$a]['label'] = $product->getSku();
                         $values[$a]['value'] = $product->getSku();
                 }
                 //print_r($pids);
                 return $values;
        }




  protected function _prepareForm()
  {
      $form = new Varien_Data_Form();
      $this->setForm($form);
      $fieldset = $form->addFieldset('beautygirl_form', array('legend'=>Mage::helper('beautygirl')->__('Item information')));
   
      $fieldset->addField('title', 'text', array(
          'label'     => Mage::helper('beautygirl')->__('Title'),
          'class'     => 'required-entry',
          'required'  => true,
          'name'      => 'title',
      ));

 $fieldset->addField('status', 'select', array(
          'label'     => Mage::helper('beautygirl')->__('Status'),
          'name'      => 'status',
          'values'    => array(
                              array(
                              'value'     => 1,
                              'label'      => Mage::helper('beautygirl')->__('Enabled'),
                               ),
                             array(
                             'value'     => 2,
                             'label'     => Mage::helper('beautygirl')->__('Disabled'),
                              ),
                              ),
         ));

    $fieldset->addField('filename', 'file', array(
          'label'     => Mage::helper('beautygirl')->__('File'),
          'required'  => true,
          'name'      => 'filename',
 ));

/* This Variable's Contain that Function's Values */

 $pids = $this->getProductCollection();
 $skus = $this->getProductCollectionskus();
 $categories_values = $this->load_tree();

 $field set->addField('girloneproductid', 'multiselect', array(
                'name' => 'girloneproductid',
                'label' => Mage::helper('beautygirl')->__('Select Product ID'), 
                'required' => true ,
                'values' => $pids,
));

 $fieldset->addField('girloneproductsku', 'multiselect', array(
                'name' => 'girloneproductsku',
                'label' => Mage::helper('beautygirl')->__('Select Product SKU'), 
                'required' => false ,
                'values' => $skus,
));

$fieldset->addField('girlonecategoryid', 'multiselect', array(
                'name' => 'girlonecategoryid',
                'label' => Mage::helper('beautygirl')->__('Select Category'), 
                'required' => false ,
                'values' => $categories_values,
));