mr-legend_wiki/inc/Form/CheckableElement.php

<?php

namespace dokuwiki\Form;

/**
 * Class CheckableElement
 *
 * For Radio- and Checkboxes
 *
 * @package dokuwiki\Form
 */
class CheckableElement extends InputElement
{
    /**
     * @param string $type The type of this element
     * @param string $name The name of this form element
     * @param string $label The label text for this element
     */
    public function __construct($type, $name, $label)
    {
        parent::__construct($type, $name, $label);
        // default value is 1
        $this->attr('value', 1);
    }

    /**
     * Handles the useInput flag and sets the checked attribute accordingly
     */
    protected function prefillInput()
    {
        global $INPUT;
        [$name, $key] = $this->getInputName();
        $myvalue = $this->val();

        if (!$INPUT->has($name)) return;

        if ($key === null) {
            // no key - single value
            $value = $INPUT->str($name);
            if ($value == $myvalue) {
                $this->attr('checked', 'checked');
            } else {
                $this->rmattr('checked');
            }
        } else {
            // we have an array, there might be several values in it
            $input = $INPUT->arr($name);
            if (isset($input[$key])) {
                $this->rmattr('checked');

                // values seem to be in another sub array
                if (is_array($input[$key])) {
                    $input = $input[$key];
                }

                foreach ($input as $value) {
                    if ($value == $myvalue) {
                        $this->attr('checked', 'checked');
                    }
                }
            }
        }
    }

    /**
     * The HTML representation of this element wrapped in a label
     * Note: allow HTML tags in label text
     *
     * @return string
     */
    public function toHTML()
    {
        if ($this->label) {
            return '<label ' . buildAttributes($this->label->attrs()) . '>' . DOKU_LF
                . $this->mainElementHTML() . DOKU_LF
                . '<span>' . $this->label->val() . '</span>' . DOKU_LF
                . '</label>';
        } else {
            return $this->mainElementHTML();
        }
    }
}