Вставка поля в форму добавления материала - Модификации расширений для Joomla

public function onContentPrepareForm($form, $data)
	{

		if (!($form instanceof JForm))
	    {
	        $this->_subject->setError('JERROR_NOT_A_FORM');
	        return false;
	    }

		if( $form->getName()!= "com_content.article" ) 
			 return true;


	    $xmlform = new SimpleXMLElement('<form />');
		$xmlfields = $xmlform->addChild('fields');
		$xmlfieldset = $xmlfields->addChild('fieldset');
		$xmlfieldset->addAttribute('name', 'default');
		$xmlfield = $xmlfieldset->addChild('field');

        $xmlfield->addAttribute('name', 'formState_list');
        $xmlfield->addAttribute('dafault', '1');
        $xmlfield->addAttribute('type', 'list');
        
        $optionYes = $xmlfield->addChild( "option", "Да" );
        $optionYes->addAttribute ( "value", "0" );

        $optionNo = $xmlfield->addChild( "option", "Нет" );
        $optionNo->addAttribute ( "value", "1" );

        $xmlfield->addAttribute('label', 'PLG_FIELD_ATTACH_FORM_LABEL');
        $xmlfield->addAttribute('description', 'PLG_ATTACH_FORM_DESCRIPTION');


        $form->setField( $xmlform );


        printf("<pre>%s</pre>", print_r( $form , true));


		return true;
	}

   
   $xmlfield =  new SimpleXMLElement('<field />');
    $xmlfield->addAttribute('name', 'formState_list');
    $xmlfield->addAttribute('dafault', '1');
    $xmlfield->addAttribute('type', 'list');

    $optionYes = $xmlfield->addChild( "option", "Да" );
    $optionYes->addAttribute ( "value", "0" );

    $optionNo = $xmlfield->addChild( "option", "Нет" );
    $optionNo->addAttribute ( "value", "1" );


    $form->setField( $xmlfield );

    $xmlform = new SimpleXMLElement('<form />');
    $xmlfields = $xmlform->addChild('fields');
    $xmlfieldset = $xmlfields->addChild('fieldset');
    $xmlfieldset->addAttribute('name', 'default');// тут
    $xmlfield = $xmlfieldset->addChild('field');

    $xmlfield->addAttribute('name', 'formState_list');
    $xmlfield->addAttribute('dafault', '1');
    $xmlfield->addAttribute('type', 'list');

    $optionYes = $xmlfield->addChild( "option", "Да" );
    $optionYes->addAttribute ( "value", "0" );

    $optionNo = $xmlfield->addChild( "option", "Нет" );
    $optionNo->addAttribute ( "value", "1" );


    $form->setField( $xmlform );

if (!($element instanceof JXMLElement)) {
			// TODO: throw exception.
			
			return false;
}

if ( $xmlform instanceof JXMLElement ) {
	    	echo "yes";
	    }
	    else {
	    	echo "no";
	    }

public function setField(&$element, $group = null, $replace = true)
	{
		// Make sure there is a valid JForm XML document.
		if (!($this->xml instanceof SimpleXMLElement))
		{
			// TODO: throw exception.

			return false;
		}

		// Make sure the element to set is valid.
		if (!($element instanceof SimpleXMLElement))
		{
			// TODO: throw exception.

			return false;
		}

$xmlform = new JXMLElement('<form />');

if (!($this->xml instanceof SimpleXMLElement))
		{
			throw new UnexpectedValueException(sprintf('%s::getFieldAttribute `xml` is not an instance of SimpleXMLElement', get_class($this)));
		}

protected static function addNode(SimpleXMLElement $source, SimpleXMLElement $new)
	{
		// Add the new child node.
		$node = $source->addChild($new->getName(), trim($new)); // магия тут

		// Add the attributes of the child node.
		foreach ($new->attributes() as $name => $value)
		{
			$node->addAttribute($name, $value);
		}

		// Add any children of the new node.
		foreach ($new->children() as $child)
		{
			self::addNode($node, $child);
		}
	}

<fieldset addfieldpath="/administrator/components/com_categories/models/fields">

<fieldset name="image-intro">

function onDisplay($name)
    {
     $user = JFactory::getUser();
      if ($user->authorise('core.edit', $asset) || $user->authorise('core.create', $asset) || count($user->getAuthorisedCategories($asset, 'core.create')) > 0 || ($user->authorise('core.edit.own', $asset) && $author == $user->id)) {
          $button = new JObject;
            $button->class = 'btn';
            $button->text = "text";
            $button->name = 'feeda';
            // $button->options = "{handler: 'iframe', size: {x: 800, y: 500}}";
            return $button;
}
    }

public function onContentBeforeDelete($context, $data)
	{
		$params = JComponentHelper::getParams("com_content");
		$params->set( "testVarForDebug", "hello ***ed world" );
		
	}

public function onContentPrepareForm($form, $data)
	{

		$params = JComponentHelper::getParams("com_content");
		echo "test val = ". $params->get("testVarForDebug");
	}

$all_attribs = json_decode($attribs);
$all_attribs->you_parametr = 1;
$attribs = json_encode($all_attribs);

$all_attribs = json_decode($attribs);
var_dump($all_attribs->you_parametr);