How to get a Field of type “image” not to have a delete checkbox?

Question

How to get a Field of type "image" not to have a delete checkbox ? As it's a required attribute for my form, I don't need the delete checkbox.

Here is my addField example :

$fieldset->addField('filename', 'image', array(
                                'label'     => Mage::helper('example')->__('Example image'),
                                'required'  => true,
                                'name'      => 'filename',
                    ));

Answer 1

You need to create a custom renderer for the image.
For this create a class in one of your modules called [Namespace]_[Module]_Block_Adminhtml_Helper_Image_Required with this content

<?php 
class [Namespace]_[Module]_Block_Adminhtml_Helper_Image_Required extends Varien_Data_Form_Element_Image{
    protected function _getDeleteCheckbox() 
    {
        return '';
    }
} 

Then in your form block, right above your field (or higher) add this lines

$fieldset->addType('required_image', '[Namespace]_[Module]_Block_Adminhtml_Helper_Image_Required');

and define your field like this:

$fieldset->addField('filename', 'required_image', array(
                            'label'     => Mage::helper('example')->__('Example image'),
                            'required'  => true,
                            'name'      => 'filename',
                ));