CheckboxElement.php

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<?php
namespace TYPO3\CMS\Backend\Form\Element;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;

class CheckboxElement extends AbstractFormElement
{
    public function render()
    {
        $html = '';
        $disabled = false;
        if ($this->data['parameterArray']['fieldConf']['config']['readOnly']) {
            $disabled = true;
        }
        // Traversing the array of items
        $items = $this->data['parameterArray']['fieldConf']['config']['items'];

        $numberOfItems = count($items);
        if ($numberOfItems === 0) {
            $items[] = ['', ''];
            $numberOfItems = 1;
        }
        $formElementValue = (int)$this->data['parameterArray']['itemFormElValue'];
        $cols = (int)$this->data['parameterArray']['fieldConf']['config']['cols'];
        if ($cols > 1) {
            $colWidth = (int)floor(12 / $cols);
            $colClass = 'col-md-12';
            $colClear = [];
            if ($colWidth == 6) {
                $colClass = 'col-sm-6';
                $colClear = [
                    2 => 'visible-sm-block visible-md-block visible-lg-block',
                ];
            } elseif ($colWidth === 4) {
                $colClass = 'col-sm-4';
                $colClear = [
                    3 => 'visible-sm-block visible-md-block visible-lg-block',
                ];
            } elseif ($colWidth === 3) {
                $colClass = 'col-sm-6 col-md-3';
                $colClear = [
                    2 => 'visible-sm-block',
                    4 => 'visible-md-block visible-lg-block',
                ];
            } elseif ($colWidth <= 2) {
                $colClass = 'checkbox-column col-sm-6 col-md-3 col-lg-2';
                $colClear = [
                    2 => 'visible-sm-block',
                    4 => 'visible-md-block',
                    6 => 'visible-lg-block'
                ];
            }
            $html .= '<div class="checkbox-row row">';
            $counter = 0;
            // @todo: figure out in which cases checkbox items to not begin at 0 and why and when this would be useful
            foreach ($items as $itemKey => $itemDefinition) {
                $label = $itemDefinition[0];
                $html .=
                    '<div class="checkbox-column ' . $colClass . '">'
                        . $this->renderSingleCheckboxElement($label, $itemKey, $formElementValue, $numberOfItems, $this->data['parameterArray'], $disabled) .
                    '</div>';
                $counter = $counter + 1;
                if ($counter < $numberOfItems && !empty($colClear)) {
                    foreach ($colClear as $rowBreakAfter => $clearClass) {
                        if ($counter % $rowBreakAfter === 0) {
                            $html .= '<div class="clearfix ' . $clearClass . '"></div>';
                        }
                    }
                }
            }
            $html .= '</div>';
        } else {
            $counter = 0;
            foreach ($items as $itemKey => $itemDefinition) {
                $label = $itemDefinition[0];
                $html .=  $this->renderSingleCheckboxElement($label, $counter, $formElementValue, $numberOfItems, $this->data['parameterArray'], $disabled);
                $counter = $counter + 1;
            }
        }
        if (!$disabled) {
            $html .= '<input type="hidden" name="' . $this->data['parameterArray']['itemFormElName'] . '" value="' . htmlspecialchars($formElementValue) . '" />';
        }
        $resultArray = $this->initializeResultArray();
        $resultArray['html'] = $html;
        return $resultArray;
    }

    protected function renderSingleCheckboxElement($label, $itemCounter, $formElementValue, $numberOfItems, $additionalInformation, $disabled)
    {
        $config = $additionalInformation['fieldConf']['config'];
        $inline = !empty($config['cols']) && $config['cols'] === 'inline';
        $checkboxParameters = $this->checkBoxParams(
            $additionalInformation['itemFormElName'],
            $formElementValue,
            $itemCounter,
            $numberOfItems,
            implode('', $additionalInformation['fieldChangeFunc'])
        );
        $checkboxId = $additionalInformation['itemFormElID'] . '_' . $itemCounter;
        return '
            <div class="checkbox' . ($inline ? ' checkbox-inline' : '') . (!$disabled ? '' : ' disabled') . '">
                <label>
                    <input type="checkbox"
                        value="1"
                        data-formengine-input-name="' . htmlspecialchars($additionalInformation['itemFormElName']) . '"
                        ' . $checkboxParameters . '
                        ' . $additionalInformation['onFocus'] . '
                        ' . (!$disabled ?: ' disabled="disabled"') . '
                        id="' . $checkboxId . '" />
                    ' . ($label ? htmlspecialchars($label) : '&nbsp;') . '
                </label>
            </div>';
    }

    protected function checkBoxParams($itemName, $formElementValue, $checkbox, $checkboxesCount, $additionalJavaScript = '')
    {
        $elementName = 'document.editform[' . Generalutility::quoteJSvalue($itemName) . ']';
        $checkboxPow = pow(2, $checkbox);
        $onClick = $elementName . '.value=this.checked?(' . $elementName . '.value|' . $checkboxPow . '):('
            . $elementName . '.value&' . (pow(2, $checkboxesCount) - 1 - $checkboxPow) . ');' . $additionalJavaScript;
        return ' onclick="' . htmlspecialchars($onClick) . '"' . ($formElementValue & $checkboxPow ? ' checked="checked"' : '');
    }
}