Magento, add and set a checkbox on grid and form backend - forms

Question

I've a fully working backend page with a grid and a corresponding form to edit the changes on the corresponding model. I added a new field on the table, bit type, as it will answer to a yes/no configuration option from the user. I added the checkbox on both grid and form.
My problem is that after a couple of hours of searching and trying different approaches I can not set the checkbox checked value both on the grid and the form reading the corresponding field from the database. Also when I click on save on the form the value corresponding to the checkbox is always saved with 1. Everything else on the grid and the form works as it should. I have read here, here, here, here and some more sites and SO questions/answers but still no clue on what I'm doing wrong. Some solutions recommend using a combo box with YES/NO options, but I want a checkbox, can't be so difficult.
Grid code inside the function _prepareColumns():
protected function _prepareColumns() {
...
$this->addColumn('banner_gral', array(
'header' => Mage::helper('banners')->__('General'),
'align' => 'center',
'index' => 'banner_gral',
'type' => 'checkbox',
'values' => $this->getBannerGral()==1 ? 'true' : 'false',
));
...
}
public function __construct()
{
parent::__construct();
$this->setId('bannersgrid');
$this->setDefaultSort('bannerid');
$this->setDefaultDir('asc');
$this->setSaveParametersInSession(true);
$this->setUseAjax(true);
}
public function getGridUrl()
{
return $this->getUrl('*/*/grid', array('_current'=>true));
}
protected function _prepareCollection()
{
$collection = Mage::getModel('banners/bannersadmin')->getCollection();
$this->setCollection($collection);
return parent::_prepareCollection();
}
Form code to add the checkbox inside the function _prepareForm():
protected function _prepareForm()
{
$id = $this->getRequest()->getParam('id');
$params = array('id' => $this->getRequest()->getParam('id'));
if (Mage::registry('banners_data')->getdata()) {
$data = Mage::registry('banners_data')->getdata();
}
elseif (Mage::getSingleton('adminhtml/session')) {
$data = Mage::getSingleton('adminhtml/session')->getdata();
Mage::getSingleton('adminhtml/session')->getdata(null);
}
else {
$data = array();
}
$form = new Varien_Data_Form(array(
'id' => 'edit_form',
'action' => $this->getUrl('*/*/save', $params),
'method' => 'post',
'enctype' => 'multipart/form-data',
));
...
$fieldset->addField('banner_gral', 'checkbox', array(
'label' => Mage::helper('banners')->__('Is general'),
'name' => 'banner_gral',
'class' => 'banner_gral',
'checked' => $this->getBannerGral()==1 ? 'true' : 'false',
'onclick' => 'this.value == this.checked ? 1 : 0',
'note' => Mage::helper('banners')->__('blablablabla'),
'tabindex' => 2
));
...
}
On the saveAction() of my form I have:
$campaign->setbanner_gral(!empty($data['banner_gral']));

Answer 1

In your controller saveAction() when saving the checkbox data do
$banner_gral = isset($your_form_Data['banner_gral']) ? 1 : 0;
For Grid and Form Page
In your controller you should have Mage::register(...)->getData() or Mage::register(...)
public function editAction()
....
Mage::register('example_data', $model);
On your form _prepareForm()
$model = Mage::registry('example_data'); // NOTE registry('example_data'); NOT registry('example_data')->getData();
$fieldset->addField('entire_range', 'checkbox', array(
....
'checked' => $model->getBannerGral()==1 ? 'true' : 'false',
......
))
see http://www.magentocommerce.com/boards/viewthread/20536/
On your grid _prepareColumns()
$this->addColumn('banner_gral', array(
....
'type' => 'checkbox',
'index' => 'banner_gral',
'values' => array(1,2),
'field_name' => 'checkbox_name',
....
));

Answer 2

#R.S answered one issue, how to save the checkbox value on the corresponding model/database field. But the issue on how to correctly display the checkbox on both the grid and the form was not solved. After doing some more searches I finally got to these two links that helped me solve my problem.
To correct the grid issue: Understanding the Grid Serializer Block
Now the part of code where the checkbox column is added, see that I added array(1,2) on the values element.
$this->addColumn('banner_gral', array(
'header' => Mage::helper('banners')->__('General'),
'width' => '20px',
'type' => 'checkbox',
'align' => 'center',
'index' => 'banner_gral',
'values' => array(1,2),
'editable' => 'false',
));
Also if you take a look into the core code of Magento, the class Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Checkbox returns an array of values. Taking a look here finally got me into the right path.
/**
* Returns values of the column
*
* #return array
*/
public function getValues()
{
if (is_null($this->_values)) {
$this->_values = $this->getColumn()->getData('values') ? $this->getColumn()->getData('values') : array();
}
return $this->_values;
}
To correct the form issue: Mage_Adminhtml_Block_System_Store_Edit_Form Class Reference
The issue on this case was that I was trying to use the $this but what I needed to use was the $data that is loaded at the beginning of the _prepareForm function. #R.S pointed the right direction, but it is not possible to use $model->getBannerGral() as the $data on the registry is an array, not a model. So, using $data["banner_gral"] I could get the needed value for the checkbox. Tested and it is working.
$fieldset->addField('banner_gral', 'checkbox', array(
'label' => Mage::helper('banners')->__('Is general'),
'name' => 'banner_gral',
'checked' => $data["banner_gral"],
'onclick' => 'this.value = this.checked ? 1 : 0;',
'note' => Mage::helper('banners')->__('blablablabla'),
'tabindex' => 2
));