C:/xampp/htdocs/moodle/mod/data/field/menu/field.class.php

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<?php
//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.org                                            //
//                                                                       //
// Copyright (C) 1999-onwards Moodle Pty Ltd  http://moodle.com          //
//                                                                       //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program is distributed in the hope that it will be useful,       //
// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
// GNU General Public License for more details:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //

class data_field_menu extends data_field_base {

    var $type = 'menu';

    function display_add_field($recordid=0) {
        global $DB, $OUTPUT;

        if ($recordid){
            $content = $DB->get_field('data_content', 'content', array('fieldid'=>$this->field->id, 'recordid'=>$recordid));
            $content = trim($content);
        } else {
            $content = '';
        }

        $str = '<div title="'.s($this->field->description).'">';

        $rawoptions = explode("\n",$this->field->param1);
        foreach ($rawoptions as $option) {
            $option = trim($option);
            if ($option) {
                $options[$option] = $option;
            }
        }


        $str .= html_writer::select($options, 'field_'.$this->field->id, $content, array(''=>get_string('menuchoose', 'data')), array('id'=>'field_'.$this->field->id));

        $str .= '</div>';

        return $str;
    }

    function display_search_field($content = '') {
        global $CFG, $DB;

        $varcharcontent =  $DB->sql_compare_text('content', 255);
        $sql = "SELECT DISTINCT $varcharcontent AS content
                  FROM {data_content}
                 WHERE fieldid=? AND content IS NOT NULL";

        $usedoptions = array();
        if ($used = $DB->get_records_sql($sql, array($this->field->id))) {
            foreach ($used as $data) {
                $value = $data->content;
                if ($value === '') {
                    continue;
                }
                $usedoptions[$value] = $value;
            }
        }

        $options = array();
        foreach (explode("\n",$this->field->param1) as $option) {
            $option = trim($option);
            if (!isset($usedoptions[$option])) {
                continue;
            }
            $options[$option] = $option;
        }
        if (!$options) {
            // oh, nothing to search for
            return '';
        }

        return html_writer::select($options, 'f_'.$this->field->id, $content);
    }

     function parse_search_field() {
            return optional_param('f_'.$this->field->id, '', PARAM_NOTAGS);
     }

    function generate_sql($tablealias, $value) {
        global $DB;

        static $i=0;
        $i++;
        $name = "df_menu_$i";
        $varcharcontent = $DB->sql_compare_text("{$tablealias}.content", 255);

        return array(" ({$tablealias}.fieldid = {$this->field->id} AND $varcharcontent = :$name) ", array($name=>$value));
    }

}