How to manage state in a tree component in reactjs?

Posted by Jessica Taylor | Updated on February 15, 2020

Want to manage state in a tree component in reactjs? I wanted to try out the tree structure with React and came up with a simple component that hides subtrees when you click on

. Everything is a TreeNode. Is this similar to what you were thinking.
TreeNode.jsx:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
var TreeNode = React.createClass({
  getInitialState: function() {
    return {
      visible: true
    };
  },
  render: function() {
    var childNodes;
    if (this.props.node.childNodes != null) {
      childNodes = this.props.node.childNodes.map(function(node, index) {
        return <li key={index}><TreeNode node={node} /></li>
      });
    }

    var style = {};
    if (!this.state.visible) {
      style.display = "none";
    }

    return (
      <div>
        <h5 onClick={this.toggle}>
          {this.props.node.title}
        </h5>
        <ul style={style}>
          {childNodes}
        </ul>
      </div>
    );
  },
  toggle: function() {
    this.setState({visible: !this.state.visible});
  }
});
bootstrap.jsx:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
var tree = {
  title: "howdy",
  childNodes: [
    {title: "bobby"},
    {title: "suzie", childNodes: [
      {title: "puppy", childNodes: [
        {title: "dog house"}
      ]},
      {title: "cherry tree"}
    ]}
  ]
};

React.render(
  <TreeNode node={tree} />,
  document.getElementById("tree")
);

If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.

How to manage state in a tree component in reactjs?

Related Questions & Answers

Solved Programs