ExtJsJsonTreeRenderer.php

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

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 = array(
            'iconCls' => $node->getIcon(),
            'text' => $node->getLabel(),
            'leaf' => !$node->hasChildNodes(),
            'id' => $node->getId(),
            'uid' => $node->getId()
        );

        foreach ($nodeArray as &$nodeItem) {
            if (is_string($nodeItem)) {
                $nodeItem = htmlspecialchars($nodeItem);
            }
        }

        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;
    }

}