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Code Editor : addinstance_form.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Adds instance form
 *
 * @package    enrol_meta
 * @copyright  2010 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once("$CFG->libdir/formslib.php");

class enrol_meta_addinstance_form extends moodleform {
    protected $course;

function definition() {
        global $CFG, $DB;

$mform  = $this->_form;
        $course = $this->_customdata;
        $this->course = $course;

$existing = $DB->get_records('enrol', array('enrol'=>'meta', 'courseid'=>$course->id), '', 'customint1, id');

// TODO: this has to be done via ajax or else it will fail very badly on large sites!
        $courses = array('' => get_string('choosedots'));
        list ($select, $join) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
        $sql = "SELECT c.id, c.fullname, c.shortname, c.visible $select FROM {course} c $join ORDER BY c.sortorder ASC";
        $rs = $DB->get_recordset_sql($sql);
        foreach ($rs as $c) {
            if ($c->id == SITEID or $c->id == $course->id or isset($existing[$c->id])) {
                continue;
            }
            context_helper::preload_from_record($c);
            $coursecontext = context_course::instance($c->id);
            if (!$c->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                continue;
            }
            if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
                continue;
            }
            $courses[$c->id] = $coursecontext->get_context_name(false);
        }
        $rs->close();

$mform->addElement('header','general', get_string('pluginname', 'enrol_meta'));

$mform->addElement('select', 'link', get_string('linkedcourse', 'enrol_meta'), $courses);
        $mform->addRule('link', get_string('required'), 'required', null, 'client');

$mform->addElement('hidden', 'id', null);
        $mform->setType('id', PARAM_INT);

$this->add_action_buttons(true, get_string('addinstance', 'enrol'));

$this->set_data(array('id'=>$course->id));
    }

function validation($data, $files) {
        global $DB, $CFG;

// TODO: this is duplicated here because it may be necessary once we implement ajax course selection element

$errors = parent::validation($data, $files);
        if (!$c = $DB->get_record('course', array('id'=>$data['link']))) {
            $errors['link'] = get_string('required');
        } else {
            $coursecontext = context_course::instance($c->id);
            $existing = $DB->get_records('enrol', array('enrol'=>'meta', 'courseid'=>$this->course->id), '', 'customint1, id');
            if (!$c->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                $errors['link'] = get_string('error');
            } else if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
                $errors['link'] = get_string('error');
            } else if ($c->id == SITEID or $c->id == $this->course->id or isset($existing[$c->id])) {
                $errors['link'] = get_string('error');
            }
        }

return $errors;
    }
}

${this.title}

Code Editor : addinstance_form.php