Question

I’m trying to add extra attributes to CMS pages. I am able to add these extra fields by following the help at http://blog.flexishore.com/2011/08/add-custom-field-to-cms-page/.

However, I cannot add images as the form for CMS pages does not have the enctype=”multipart/form-data”. To get around this I am having to create a local copy of the original Magento file. \app\code\local\Mage\Adminhtml\Block\Cms\Page\Edit\Form.php

Ideally, I would like to inject the enctype using the observer. I have trolled around everywhere and haven’t come across a suitable solution.

I was hoping to be able to add something like $form->setHtmlAttributes(‘enctype’, ‘multipart/form-data’)

  public function prepareFormMainTab(Varien_Event_Observer $observer)
  {
    $form = $observer->getEvent()->getForm();

    $fieldset = $form->addFieldset('fieldset', array(
        'legend' => 'CMS Extras',
        'class' => 'fieldset-wide'
            )
    );

    $fieldset->addField('imagefile', 'image', array(
        'name' => 'imagefile',
        'label' => 'Image',
        'title' => 'Image'
    ));
  }

Answer 1

I found the solution.

First, I extended the Mage_Adminhtml and Mage_Cms modules. Somehow, the modification works even without doing this! Maybe someone could explain why.

  <modules>
    <Myname_Mymodule>
      <active>true</active>
      <codePool>local</codePool>
      <depends>
        <Mage_Cms/>
        <Mage_Adminhtml/>
      </depends>
    </Myname_Mymodule>
  </modules>

I rewrite the Adminhtml block.

<blocks>
  <mymodule>
    <class>Myname_Mymodule_Block</class>
  </mymodule>
  <adminhtml>
    <rewrite>
      <cms_page_edit_form>Myname_Mymodule_Block_Adminhtml_Cms_Page_Edit_Form</cms_page_edit_form>
    </rewrite>
  </adminhtml>
</blocks>

I copied \app\code\core\Mage\Adminhtml\Block\Cms\Page\Edit\Form.php to \app\code\local\Myname\Mymodule\Block\Adminhtml\Cms\Page\Edit\Form.php and added the enctype for the form.

class Myname_Mymodule_Block_Adminhtml_Cms_Page_Edit_Form extends Mage_Adminhtml_Block_Widget_Form
{

  protected function _prepareForm()
  {
    $form = new Varien_Data_Form(array('id' => 'edit_form', 'action' => $this->getData('action'), 'method' => 'post', 'enctype' => 'multipart/form-data'));
    $form->setUseContainer(true);
    $this->setForm($form);
    return parent::_prepareForm();
  }

}

NOTE
Though I am able to get the desired result, I am unable to understand how.

1. I imagined that removing the “depends” bit from the module would stop the custom block from working. It didn’t!
2. From what I read on various blogs, I should have had class Myname_Mymodule_Block_Adminhtml_Cms_Page_Edit_Form extends Mage_Adminhtml_Block_Cms_Page_Edit_Form. Doing that doesn’t work.