Add Category Position Field In Adminhtml Edit Form

We just need extends 'Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes'

and Rewrite function _prepareForm();

add These code into function :

		if ($this->getAddHiddenFields()) {
			$fieldset->addField('position', 'text', array(
					'label'=>'Position',
					'name'  => 'position',
					'value' => $this->getCategory()->getPosition(),
			));
		}

 and do not forget change last code to :

return Mage_Adminhtml_Block_Catalog_Form::_prepareForm();

not return Parent::_prepareForm();

 

Now I will told you how to rewrite this block .

1. Define the block in our config xml file

<?xml version="1.0"?>
<config>
  <modules>
    <Bysoft_Myadminhtml>
      <version>0.1.0</version>
    </Bysoft_Myadminhtml>
  </modules>
  <global>
    <helpers>
      <myadminhtml>
        <class>Bysoft_Myadminhtml_Helper</class>
      </myadminhtml>
    </helpers>
	<blocks>
			<adminhtml>
				<rewrite>
					<catalog_category_tab_attributes>Bysoft_Myadminhtml_Block_Catalog_Category_Tab_Attributes</catalog_category_tab_attributes>
				</rewrite>
			</adminhtml>
	</blocks>
  </global>
</config> 

 2. create local block file . extends core block file:

<?php
class Bysoft_Myadminhtml_Block_Catalog_Category_Tab_Attributes extends Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes
{
	/**
	 * Prepare form before rendering HTML
	 *
	 * @return Mage_Adminhtml_Block_Catalog_Category_Tab_Attributes
	 */
	protected function _prepareForm() {
		$group      = $this->getGroup();
		$attributes = $this->getAttributes();
	
		$form = new Varien_Data_Form();
		$form->setHtmlIdPrefix('group_' . $group->getId());
		$form->setDataObject($this->getCategory());
	
		$fieldset = $form->addFieldset('fieldset_group_' . $group->getId(), array(
				'legend'    => Mage::helper('catalog')->__($group->getAttributeGroupName()),
				'class'     => 'fieldset-wide',
		));
		if ($this->getAddHiddenFields()) {
			if (!$this->getCategory()->getId()) {
				// path
				if ($this->getRequest()->getParam('parent')) {
					$fieldset->addField('path', 'hidden', array(
							'name'  => 'path',
							'value' => $this->getRequest()->getParam('parent')
					));
				}
				else {
					$fieldset->addField('path', 'hidden', array(
							'name'  => 'path',
							'value' => 1
					));
				}
			}
			else {
				$fieldset->addField('id', 'hidden', array(
						'name'  => 'id',
						'value' => $this->getCategory()->getId()
				));
				$fieldset->addField('path', 'hidden', array(
						'name'  => 'path',
						'value' => $this->getCategory()->getPath()
				));
			}
		}
		$this->_setFieldset($attributes, $fieldset);
		foreach ($attributes as $attribute) {
			$rootId = Mage_Catalog_Model_Category::TREE_ROOT_ID;
			/* @var $attribute Mage_Eav_Model_Entity_Attribute */
			if ($attribute->getAttributeCode() == 'url_key') {
				if (
						(!$this->getCategory()->getId() && $this->getRequest()->getParam('parent', $rootId) == $rootId)
						|| ($this->getCategory()->getParentId() == $rootId)
				) {
					$fieldset->removeField('url_key');
				} else {
					$form->getElement('url_key')->setRenderer(
							$this->getLayout()->createBlock('adminhtml/catalog_form_renderer_attribute_urlkey')
					);
				}
			}
		}
		if ($this->getAddHiddenFields()) {
			$fieldset->addField('position', 'text', array(
					'label'=>'Position',
					'name'  => 'position',
					'value' => $this->getCategory()->getPosition(),
			));
		}
	
		if ($this->getCategory()->getLevel() == 1) {
			$fieldset->removeField('custom_use_parent_settings');
		} else {
			if ($this->getCategory()->getCustomUseParentSettings()) {
				foreach ($this->getCategory()->getDesignAttributes() as $attribute) {
					if ($element = $form->getElement($attribute->getAttributeCode())) {
						$element->setDisabled(true);
					}
				}
			}
			if ($element = $form->getElement('custom_use_parent_settings')) {
				$element->setData('onchange', 'onCustomUseParentChanged(this)');
			}
		}
	
		if ($this->getCategory()->hasLockedAttributes()) {
			foreach ($this->getCategory()->getLockedAttributes() as $attribute) {
				if ($element = $form->getElement($attribute)) {
					$element->setReadonly(true, true);
				}
			}
		}
	
		if (!$this->getCategory()->getId()){
			$this->getCategory()->setIncludeInMenu(1);
		}
	
		$form->addValues($this->getCategory()->getData());
	
		Mage::dispatchEvent('adminhtml_catalog_category_edit_prepare_form', array('form'=>$form));
	
		$form->setFieldNameSuffix('general');
		$this->setForm($form);
	
		return Mage_Adminhtml_Block_Catalog_Form::_prepareForm();
	}
}