/plugins/system/nnframework/fields/articles.php

<?php
/**
 * Element: Articles
 * Displays an article id field with a button
 *
 * @package         NoNumber Framework
 * @version         12.8.2
 *
 * @author          Peter van Westen <peter@nonumber.nl>
 * @link            http://www.nonumber.nl
 * @copyright       Copyright Š 2012 NoNumber All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

// No direct access
defined('_JEXEC') or die;

/**
 * Articles Element
 */
class nnFieldArticles
{
	var $_version = '12.8.2';

	function getInput($name, $id, $value, $params, $children)
	{
		$this->params = $params;

		JHtml::_('behavior.modal', 'a.modal');

		$_size = $this->def('size');
		$_multiple = $this->def('multiple', 1);

		$_doc = JFactory::getDocument();

		$_js_part = "
			if ( document.getElementById(object+'_name') ) {
				document.getElementById(object+'_id').value = id;
				document.getElementById(object+'_name').value = title;
			} else {
				// multiple
				var vals = document.getElementById(object+'_id').value.trim().split(',');
				vals[vals.length] = id;
				var tmpvals = new Array();
				for ( var i=0; i<vals.length; i++ ) {
					val = vals[i].trim().toInt();
					if ( val ) {
						tmpvals[val] = val;
					}
				}
				vals = new Array();
				for ( val in tmpvals ) {
					if ( typeof(tmpvals[val]) === 'number'  ) {
						vals[vals.length] = tmpvals[val];
					}
				}
				document.getElementById(object+'_id').value = vals.join();
			}";

		$_js = "
			function nnSelectArticle_".$id."( id, title, catid )
			{
				var object = '".$id."';
				".$_js_part."
				SqueezeBox.close();
			}";
		$_doc->addScriptDeclaration($_js);
		$_link = 'index.php?option=com_content&amp;view=articles&amp;layout=modal&amp;tmpl=component&amp;function=nnSelectArticle_'.$id;

		$html = "\n".'<div style="float: left;">';
		if (!$_multiple) {
			$val_name = $value;
			if ($value) {
				$db = JFactory::getDBO();
				$query = $db->getQuery(true);
				$query->select('c.title');
				$query->from('#__content AS c');
				$query->where('c.id = '.(int) $value);
				$db->setQuery($query);
				$val_name = $db->loadResult();
				$val_name .= ' ['.$value.']';
			}
			$html .= '<input type="text" id="'.$id.'_name" value="'.$val_name.'" class="inputbox" size="'.$_size.'" disabled="disabled" />';
			$html .= '<input type="hidden" name="'.$name.'" id="'.$id.'_id" value="'.$value.'" />';
		} else {
			$html .= '<input type="text" name="'.$name.'" id="'.$id.'_id" value="'.$value.'" class="inputbox" size="'.$_size.'" />';
		}
		$html .= '</div>';
		$html .= '<div class="button2-left"><div class="blank"><a class="modal" title="'.JText::_('NN_SELECT_AN_ARTICLE').'"  href="'.$_link.'" rel="{handler: \'iframe\', size: {x: 650, y: 375}}">'.JText::_('NN_SELECT').'</a></div></div>'."\n";

		return $html;
	}

	private function def($val, $default = '')
	{
		return (isset($this->params[$val]) && (string) $this->params[$val] != '') ? (string) $this->params[$val] : $default;
	}
}

class JFormFieldNN_Articles extends JFormField
{
	/**
	 * The form field type
	 *
	 * @var		string
	 */
	public $type = 'Articles';

	protected function getInput()
	{
		$this->_nnfield = new nnFieldArticles();
		return $this->_nnfield->getInput($this->name, $this->id, $this->value, $this->element->attributes(), $this->element->children());
	}
}