ExtJsJsonTreeRenderer.php

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<?php
namespace TYPO3\CMS\Backend\Tree\Renderer;

/*
 * 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 ExtJsJsonTreeRenderer extends \TYPO3\CMS\Backend\Tree\Renderer\AbstractTreeRenderer
{
    protected $recursionLevel = 0;

    public function renderNode(\TYPO3\CMS\Backend\Tree\TreeRepresentationNode $node, $recursive = true)
    {
        $nodeArray = $this->getNodeArray($node);
        if ($recursive && $node->hasChildNodes()) {
            $this->recursionLevel++;
            $children = $this->renderNodeCollection($node->getChildNodes());
            $nodeArray['children'] = $children;
            $this->recursionLevel--;
        }
        return $nodeArray;
    }

    protected function getNodeArray(\TYPO3\CMS\Backend\Tree\TreeRepresentationNode $node)
    {
        $nodeArray = [
            'iconTag' => $node->getIcon(),
            'text' => htmlspecialchars($node->getLabel()),
            'leaf' => !$node->hasChildNodes(),
            'id' => htmlspecialchars($node->getId()),
            'uid' => htmlspecialchars($node->getId())
        ];

        return $nodeArray;
    }

    public function renderTree(\TYPO3\CMS\Backend\Tree\AbstractTree $tree, $recursive = true)
    {
        $this->recursionLevel = 0;
        $children = $this->renderNode($tree->getRoot(), $recursive);
        return json_encode($children);
    }

    public function renderNodeCollection(\TYPO3\CMS\Backend\Tree\TreeNodeCollection $collection, $recursive = true)
    {
        foreach ($collection as $node) {
            $treeItems[] = $this->renderNode($node, $recursive);
        }
        return $treeItems;
    }
}