如何使输入能够在angular-ui-tree中写入文本？

<ui-tree>
  <ul>
    <li ui-tree-node ng-repeat="node in treeData">
      <div ui-tree-handle>
        {{ node.text }}
      </div>
      <ol ui-tree-nodes ng-model="node.children">
        <li ui-tree-node ng-repeat="child in node.children">
          <div ui-tree-handle>
            {{ child.text }}
          </div>
        </li>
      </ol>
    </li>
  </ul>
</ui-tree>

app.controller('TreeController', function($scope) {
  $scope.treeData = [
    {
      text: 'Node 1',
      children: [
        {
          text: 'Child 1'
        },
        {
          text: 'Child 2'
        }
      ]
    },
    {
      text: 'Node 2',
      children: [
        {
          text: 'Child 3'
        },
        {
          text: 'Child 4'
        }
      ]
    }
  ];
});

app.controller('TreeController', function($scope) {
  // ...

  $scope.updateText = function(node, newText) {
    node.text = newText;
  };
});

<ui-tree>
  <ul>
    <li ui-tree-node ng-repeat="node in treeData">
      <div ui-tree-handle>
        <input type="text" ng-model="node.text" ng-change="updateText(node, node.text)">
      </div>
      <ol ui-tree-nodes ng-model="node.children">
        <li ui-tree-node ng-repeat="child in node.children">
          <div ui-tree-handle>
            <input type="text" ng-model="child.text" ng-change="updateText(child, child.text)">
          </div>
        </li>
      </ol>
    </li>
  </ul>
</ui-tree>