How to add value dynamically to multiselect attribute in magento? - php

Question

I have used the following code for to add multiselect attribute in mine custom module Form
$fieldset->addField('multiselect2', 'multiselect', array(
'label' => Mage::helper('checkout')->__('Select Type2'),
'class' => 'required-entry',
'required' => true,
'name' => 'title',
'onclick' => "return false;",
'onchange' => "return false;",
'value' => '4',
'values' => array(
'-1'=> array( 'label' => 'Please Select..', 'value' => '-1'),
'1' => array(
'value'=> array(array('value'=>'2' , 'label' => 'Option2') , array('value'=>'3' , 'label' =>'Option3') ),
'label' => 'Size'
),
'2' => array(
'value'=> array(array('value'=>'4' , 'label' => 'Option4') , array('value'=>'5' , 'label' =>'Option5') ),
'label' => 'Color'
),
),
'disabled' => false,
'readonly' => false,
'after_element_html' => '<small>Comments</small>',
'tabindex' => 1
));
Its working Good. But i want to set the values as dynamically. That means I want to display all category list under this multiselect attribute. I have searched lot of things. But i cant get. Can we use foreach loop for adding value to that attribute? or have any other way to do this? Please help me guys!

Answer 1

You can prepare values array with any data before and then use it in your form. For categories it's smth like this:
$categories = Mage::getModel('catalog/category');
$values = array();
foreach ($categories as $category) {
$values[] = array('label' => $category->getName(), 'value' => $category->getId());
}
Hope it's clear and works for you.