tk2/forms/TKCheckBox.php5

<?php

class TKCheckBox extends TKFormInput {
    public function __construct($name, $value = "", $checked = false) {
        parent::__construct('checkbox', $name, $value);
        $this->addProperty('checked', self::PROP_BOOLEAN);
        $this->set('checked', $checked);

        $this->addEvent('oncheck', self::EVENT_INDIRECT);
        $this->addEvent('onuncheck', self::EVENT_INDIRECT);

        $this->setAction('onchange', "if(this.checked==true){");
        $this->setAction('onchange', new TKEmitAction($this, 'oncheck'));
        $this->setAction('onchange', "}else{");
        $this->setAction('onchange', new TKEmitAction($this, 'onuncheck'));
        $this->setAction('onchange', "}");
    }

    public function renderComponent($class, $style, $events, $id) {
        if($this->get('checked') == true)
            $events .= " checked=\"checked\"";
        return parent::renderComponent($class, $style, $events, $id);
    }
}

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