ButtonViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers\Form;

/*                                                                        *
 * This script belongs to the FLOW3 package "TYPO3.Fluid".                *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class ButtonViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\AbstractFormFieldViewHelper {

    protected $tagName = 'button';

    public function initializeArguments() {
        parent::initializeArguments();
        $this->registerTagAttribute('autofocus', 'string', 'Specifies that a button should automatically get focus when the page loads');
        $this->registerTagAttribute('disabled', 'string', 'Specifies that the input element should be disabled when the page loads');
        $this->registerTagAttribute('form', 'string', 'Specifies one or more forms the button belongs to');
        $this->registerTagAttribute('formaction', 'string', 'Specifies where to send the form-data when a form is submitted. Only for type="submit"');
        $this->registerTagAttribute('formenctype', 'string', 'Specifies how form-data should be encoded before sending it to a server. Only for type="submit" (e.g. "application/x-www-form-urlencoded", "multipart/form-data" or "text/plain")');
        $this->registerTagAttribute('formmethod', 'string', 'Specifies how to send the form-data (which HTTP method to use). Only for type="submit" (e.g. "get" or "post")');
        $this->registerTagAttribute('formnovalidate', 'string', 'Specifies that the form-data should not be validated on submission. Only for type="submit"');
        $this->registerTagAttribute('formtarget', 'string', 'Specifies where to display the response after submitting the form. Only for type="submit" (e.g. "_blank", "_self", "_parent", "_top", "framename")');
        $this->registerUniversalTagAttributes();
    }

    public function render($type = 'submit') {
        $name = $this->getName();
        $this->registerFieldNameForFormTokenGeneration($name);

        $this->tag->addAttribute('type', $type);
        $this->tag->addAttribute('name', $name);
        $this->tag->addAttribute('value', $this->getValue());
        $this->tag->setContent($this->renderChildren());

        return $this->tag->render();
    }
}