Just create one file and extended it with magento core abstract class. See example
Just add code into Your Form.php
class Kanasagra_Jaydip_Block_Adminhtml_{{Entity}}_Edit_Tab_Form extends Mage_Adminhtml_Block_Widget_Form {
protected function _prepareForm() {
$form = new Varien_Data_Form(array(
'id' => 'edit_form',
'action' => $this->getUrl('*/*/save', array('id' => $this->getRequest()->getParam('id'))),
'method' => 'post',
'enctype' => 'multipart/form-data'
)
);
$fieldset = $form->addFieldset('{{Entity}}_form', array('legend' => Mage::helper('{{Entity}}')->__('Product information')));
$fieldset->addType('file', Mage::getConfig() ->getBlockClassName('jaydip/Adminhtml_{{Entity}}_Helper_File')); $fieldset->addField('svgimage', 'file', array( 'label' => Mage::helper('jaydip')->__('Upload SVG'), 'required' => false, 'name' => 'svgimage', )); ...
...
...
}
}
Create New file in Kanasagra/Jaydip/Block/Adminhtml/{{Entity}}/Helper/File.php
<?php
class Kanasagra_Jaydip_Block_Adminhtml_{{Entity}}_Helper_File extends Varien_Data_Form_Element_Abstract{
public function __construct($data){
parent::__construct($data);
$this->setType('file');
}
public function getElementHtml(){
$html = '';
$this->addClass('input-file');
$html.= parent::getElementHtml();
if ($this->getValue()) {
$url = $this->_getUrl();
if( !preg_match("/^http\:\/\/|https\:\/\//", $url) ) {
$url = Mage::getBaseUrl('media').'photo_image/images/' . $url; //replace this with the path to the file if you upload it somewhere else
}
$html .= '<br /><img width="100px" src="'.$url.'">';
}
return $html;
}
protected function _getUrl(){
return $this->getValue();
}
}
