mod_form.php

<?php

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

require_once($CFG->dirroot . '/course/moodleform_mod.php');

class mod_testingdemo_mod_form extends moodleform_mod {

    public function definition() {
        global $CFG, $COURSE;

        $mform = $this->_form;

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

        $mform->addElement('text', 'name', get_string('name', 'testingdemo'), array('size'=>'64'));
        if (!empty($CFG->formatstringstriptags)) {
            $mform->setType('name', PARAM_TEXT);
        } else {
            $mform->setType('name', PARAM_CLEANHTML);
        }
        $mform->addRule('name', null, 'required', null, 'client');
        $mform->addRule('name', get_string('maximumchars', '', 255), 'maxlength', 255, 'client');

        $this->add_intro_editor(true, get_string('description', 'testingdemo'));

        $this->standard_coursemodule_elements();
        $this->apply_admin_defaults();
        $this->add_action_buttons();
    }
}