Expandable object tree view

Renders a tree view of a JSON object or array with collapsible content.

• Use the value of the toggled prop to determine the initial state of the content (collapsed/expanded).
• Use the useState() hook to create the isToggled state variable and give it the value of the toggled prop initially.
• Render a <span> element and bind its onClick event to alter the component's isToggled state.
• Determine the appearance of the component, based on isParentToggled, isToggled, name and checking for Array.isArray() on data.
• For each child in data, determine if it is an object or array and recursively render a sub-tree or a text element with the appropriate style.

.tree-element {
  margin: 0 0 0 4px;
  position: relative;
}

.tree-element.is-child {
  margin-left: 16px;
}

div.tree-element:before {
  content: '';
  position: absolute;
  top: 24px;
  left: 1px;
  height: calc(100% - 48px);
  border-left: 1px solid gray;
}

p.tree-element {
  margin-left: 16px;
}

.toggler {
  position: absolute;
  top: 10px;
  left: 0px;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid gray;
  cursor: pointer;
}

.toggler.closed {
  transform: rotate(90deg);
}

.collapsed {
  display: none;
}

const TreeView = ({
  data,
  toggled = true,
  name = null,
  isLast = true,
  isChildElement = false,
  isParentToggled = true
}) => {
  const [isToggled, setIsToggled] = React.useState(toggled);
  const isDataArray = Array.isArray(data);

  return (
    <div
      className={`tree-element ${isParentToggled && 'collapsed'} ${
        isChildElement && 'is-child'
      }`}
    >
      <span
        className={isToggled ? 'toggler' : 'toggler closed'}
        onClick={() => setIsToggled(!isToggled)}
      />
      {name ? <strong>&nbsp;&nbsp;{name}: </strong> : <span>&nbsp;&nbsp;</span>}
      {isDataArray ? '[' : '{'}
      {!isToggled && '...'}
      {Object.keys(data).map((v, i, a) =>
        typeof data[v] === 'object' ? (
          <TreeView
            key={`${name}-${v}-${i}`}
            data={data[v]}
            isLast={i === a.length - 1}
            name={isDataArray ? null : v}
            isChildElement
            isParentToggled={isParentToggled && isToggled}
          />
        ) : (
          <p
            key={`${name}-${v}-${i}`}
            className={isToggled ? 'tree-element' : 'tree-element collapsed'}
          >
            {isDataArray ? '' : <strong>{v}: </strong>}
            {data[v]}
            {i === a.length - 1 ? '' : ','}
          </p>
        )
      )}
      {isDataArray ? ']' : '}'}
      {!isLast ? ',' : ''}
    </div>
  );
};

const data = {
  lorem: {
    ipsum: 'dolor sit',
    amet: {
      consectetur: 'adipiscing',
      elit: [
        'duis',
        'vitae',
        {
          semper: 'orci'
        },
        {
          est: 'sed ornare'
        },
        'etiam',
        ['laoreet', 'tincidunt'],
        ['vestibulum', 'ante']
      ]
    },
    ipsum: 'primis'
  }
};
ReactDOM.render(
  <TreeView data={data} name="data" />,
  document.getElementById('root')
);