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Magento configuration – populating field when using frontend_model

I have specified a frontend_model in system.xml for an entry field. I did this because I wanted to make a field read-only. There may have been a more straightforward way to achieve that, but that’s where I am at the moment. The thing is I cannot get the field to display the data it should.

I have a button that when pressed, populates the read-only field. That works fine. But when I hit ‘Save Config’, the data disappears from the field. The reason it disappears is because I can’t find out what I should set the field’s value to. Below tries using the getEscapedValue() method of Varien_Data_Form_Element_Abstract, but it returns nothing. And as usual with Magento, there is no documentation to speak of.

class Mypackage_MyModule_Block_Adminhtml_System_Config_DisabledText extends Mage_Adminhtml_Block_System_Config_Form_Field
{
    protected function _prepareLayout()
    {
        parent::_prepareLayout();
        if (!$this->getTemplate()) {
            $this->setTemplate('mypackage/system/config/disabled_text.phtml');
        }
        return $this;
    }

    public function render(Varien_Data_Form_Element_Abstract $element)
    {
        $element->unsScope()->unsCanUseWebsiteValue()->unsCanUseDefaultValue();
        return parent::render($element);
    }

    protected function _getElementHtml(Varien_Data_Form_Element_Abstract $element)
    {
        $originalData = $element->getOriginalData();
        $this->addData(array(
            'my_value' => $element->getEscapedValue(),
            'html_id' => $element->getHtmlId(),
        ));
        return $this->_toHtml();
    }
}

disabled_text.phtml contains the following:

<input id="<?php echo $this->getHtmlId() ?>" value="<?php echo $this->getMyValue(); ?>" class=" input-text" type="text" disabled/>

Thanks.

Magento configuration – populating field when using frontend_model

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