combo.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

JFormHelper::loadFieldClass('list');

/**
 * Form Field class for the Joomla Platform.
 * Implements a combo box field.
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormFieldCombo extends JFormFieldList
{
        /**
         * The form field type.
         *
         * @var    string
         * @since  11.1
         */
        protected $type = 'Combo';

        /**
         * Method to get the field input markup for a combo box field.
         *
         * @return  string  The field input markup.
         *
         * @since   11.1
         */
        protected function getInput()
        {
                $html = array();
                $attr = '';

                // Initialize some field attributes.
                $attr .= !empty($this->class) ? ' class=combobox"' . $this->class . '"' : ' class="combobox"';
                $attr .= $this->readonly ? ' readonly' : '';
                $attr .= $this->disabled ? ' disabled' : '';
                $attr .= !empty($this->size) ? ' size="' . $this->size . '"' : '';
                $attr .= $this->required ? ' required aria-required="true"' : '';

                // Initialize JavaScript field attributes.
                $attr .= $this->onchange ? ' onchange="' . $this->onchange . '"' : '';

                // Get the field options.
                $options = $this->getOptions();

                // Load the combobox behavior.
                JHtml::_('behavior.combobox');

                $html[] = '<div class="combobox input-append">';

                // Build the input for the combo box.
                $html[] = '<input type="text" name="' . $this->name . '" id="' . $this->id . '" value="'
                        . htmlspecialchars($this->value, ENT_COMPAT, 'UTF-8') . '"' . $attr . ' autocomplete="off" />';

                $html[] = '<div class="btn-group">';
                $html[] = '<button type="button" class="btn dropdown-toggle">';
                $html[] = '             <span class="caret"></span>';
                $html[] = '</button>';

                // Build the list for the combo box.
                $html[] = '<ul class="dropdown-menu">';

                foreach ($options as $option)
                {
                        $html[] = '<li><a href="#">' . $option->text . '</a></li>';
                }

                $html[] = '</ul>';

                $html[] = '</div></div>';

                return implode($html);
        }
}