ButtonViewHelper.php

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

/*
 * 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!
 */

class ButtonViewHelper extends 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();
        $this->registerArgument('type', 'string', 'Specifies the type of button (e.g. "button", "reset" or "submit")', false, 'submit');
    }

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

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

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