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See Release Notes

  • Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
  • Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
  • PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/lib/form/ -> group.php (source)
<?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/>.


/**
 * Form element group
 *
 * Contains HTML class for group form element
 *
 * @package   core_form
 * @copyright 2007 Jamie Pratt <me@jamiep.org>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once("HTML/QuickForm/group.php");
require_once('templatable_form_element.php');

/**
 * HTML class for a form element group
 *
 * Overloaded {@link HTML_QuickForm_group} with default behavior modified for Moodle.
 *
 * @package   core_form
 * @category  form
 * @copyright 2007 Jamie Pratt <me@jamiep.org>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class MoodleQuickForm_group extends HTML_QuickForm_group implements templatable {
    use templatable_form_element {
        export_for_template as export_for_template_base;
    }

    /** @var string html for help button, if empty then no help */
    var $_helpbutton='';

    /** @var MoodleQuickForm */
    protected $_mform = null;

    protected $_renderedfromtemplate = false;

    /**
     * constructor
     *
     * @param string $elementName (optional) name of the group
     * @param string $elementLabel (optional) group label
     * @param array $elements (optional) array of HTML_QuickForm_element elements to group
     * @param string $separator (optional) string to seperate elements.
     * @param string $appendName (optional) string to appened to grouped elements.
     */
    public function __construct($elementName=null, $elementLabel=null, $elements=null, $separator=null, $appendName = true) {
        parent::__construct($elementName, $elementLabel, $elements, $separator, $appendName);
    }

    /**
     * Old syntax of class constructor. Deprecated in PHP7.
     *
     * @deprecated since Moodle 3.1
     */
    public function MoodleQuickForm_group($elementName=null, $elementLabel=null, $elements=null, $separator=null, $appendName = true) {
        debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
        self::__construct($elementName, $elementLabel, $elements, $separator, $appendName);
    }

    /** @var string template type, would cause problems with client side validation so will leave for now */
    //var $_elementTemplateType='fieldset';

    /**
     * set html for help button
     */
    function getHelpButton(){
        return $this->_helpbutton;
    }

    /**
     * Returns element template, nodisplay/static/fieldset
     *
     * @return string
     */
    function getElementTemplateType(){
        if ($this->_flagFrozen){
            if ($this->getGroupType() == 'submit'){
                return 'nodisplay';
            } else {
                return 'static';
            }
        } else {
            if ($this->getGroupType() == 'submit') {
                return 'actionbuttons';
            }
            return 'fieldset';
        }
    }

    /**
     * Sets the grouped elements and hides label
     *
     * @param array $elements
     */
    function setElements($elements){
        parent::setElements($elements);
        foreach ($this->_elements as $element){
            if (method_exists($element, 'setHiddenLabel')){
                $element->setHiddenLabel(true);
            }
        }
    }

    /**
     * Stores the form this element was added to
     * This object is later used by {@link MoodleQuickForm_group::createElement()}
     * @param null|MoodleQuickForm $mform
     */
    public function setMoodleForm($mform) {
        if ($mform && $mform instanceof MoodleQuickForm) {
            $this->_mform = $mform;
        }
    }

    /**
     * Called by HTML_QuickForm whenever form event is made on this element
     *
     * If this function is overridden and parent is not called the element must be responsible for
     * storing the MoodleQuickForm object, see {@link MoodleQuickForm_group::setMoodleForm()}
     *
     * @param     string $event Name of event
     * @param     mixed $arg event arguments
     * @param     mixed $caller calling object
     */
    public function onQuickFormEvent($event, $arg, &$caller) {
        $this->setMoodleForm($caller);
        return parent::onQuickFormEvent($event, $arg, $caller);
    }

    /**
     * Creates an element to add to the group
     * Expects the same arguments as MoodleQuickForm::createElement()
     */
    public function createFormElement() {
        if (!$this->_mform) {
            throw new coding_exception('You can not call createFormElement() on the group element that was not yet added to a form.');
        }
        return call_user_func_array([$this->_mform, 'createElement'], func_get_args());
    }

> /** public function export_for_template(renderer_base $output) { > * Return attributes suitable for passing to {@see createFormElement}, comprised of all group attributes without ID in global $OUTPUT; > * order to ensure uniqueness of that value within the group > * $context = $this->export_for_template_base($output); > * @return array > */ $this->_renderedfromtemplate = true; > public function getAttributesForFormElement(): array { > return array_diff_key((array) $this->getAttributes(), array_flip(['id'])); include_once('HTML/QuickForm/Renderer/Default.php'); > } >
$elements = []; $name = $this->getName(); $i = 0; foreach ($this->_elements as $key => $element) { $elementname = ''; if ($this->_appendName) { $elementname = $element->getName(); if (isset($elementname)) { $element->setName($name . '['. (strlen($elementname) ? $elementname : $key) .']'); } else { $element->setName($name); } } $element->_generateId(); $out = $OUTPUT->mform_element($element, false, false, '', true); if (empty($out)) { $renderer = new HTML_QuickForm_Renderer_Default(); $renderer->setElementTemplate('{element}'); $element->accept($renderer); $out = $renderer->toHtml(); } // Replicates the separator logic from 'pear/HTML/QuickForm/Renderer/Default.php'. $separator = ''; if ($i > 0) { if (is_array($this->_separator)) { $separator = $this->_separator[($i - 1) % count($this->_separator)]; } else if ($this->_separator === null) { $separator = '&nbsp;'; } else { $separator = (string) $this->_separator; } } $elements[] = [ 'separator' => $separator, 'html' => $out ]; // Restore the element's name. if ($this->_appendName) { $element->setName($elementname); } $i++; } $context['groupname'] = $name; $context['elements'] = $elements; return $context; } /** * Accepts a renderer * * @param object An HTML_QuickForm_Renderer object * @param bool Whether a group is required * @param string An error message associated with a group * @access public * @return void */ public function accept(&$renderer, $required = false, $error = null) { $this->_createElementsIfNotExist(); $renderer->startGroup($this, $required, $error); if (!$this->_renderedfromtemplate) { // Backwards compatible path - only do this if we didn't render the sub-elements already. $name = $this->getName(); foreach (array_keys($this->_elements) as $key) { $element =& $this->_elements[$key]; $elementname = ''; if ($this->_appendName) { $elementname = $element->getName(); if (isset($elementname)) { $element->setName($name . '['. (strlen($elementname) ? $elementname : $key) .']'); } else { $element->setName($name); } } $required = !$element->isFrozen() && in_array($element->getName(), $this->_required); $element->accept($renderer, $required); // Restore the element's name. if ($this->_appendName) { $element->setName($elementname); } } } $renderer->finishGroup($this); } /** * Calls the validateSubmitValue function for the containing elements and returns an error string as soon as it finds one. * * @param array $values Values of the containing elements. * @return string|null Validation error message or null. */ public function validateSubmitValue($values) { foreach ($this->_elements as $element) { if (method_exists($element, 'validateSubmitValue')) { $value = $values[$element->getName()] ?? null; $result = $element->validateSubmitValue($value); if (!empty($result) && is_string($result)) { return $result; } } } } }